JPH01277137A - Temperature control device in hot water-circulating heater - Google Patents

Abstract

PURPOSE:To heat up the loads rapidly at the start and thereafter maintain the loads at an appropriate temperature by circulating hot water heated to higher temperature than a set level immediately after the start of heating and thereafter circulating hot water at a set temperature level. CONSTITUTION:The main apparatus 1 of a heater is e quipped with an internally circulating channel 2 which is designed to reheat the water returning from circulation through loads such as floor heating. When the heating switch is turned on, a timer is activated and high temperature control is started at 80 deg.C. At the start of the control, a proportional valve 10 and a solenoid valve 8 are both fully opened in heating and, when the temperature reaches a standard (80 deg.C) of higher temperature control, the proportional valve 10 is moved in the closing direction. When the temperature falls, the proportional valve 10 is moved in the opening direction so that the temperature of the circulating water fluctuates in a range a little higher than the standard. At the end of a preset timing period, a microcomputer enters into a procedure for lower temperature control and maintains the lower temperature control until the heating switch is turned off.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is used in a hot water circulation type heater that circulates relatively low-temperature hot water to heat the room. This invention relates to a temperature control device for a hot water circulation type heater that can heat the room.

<Problems to be solved by conventional technology and inventions> In floor heating, which warms the floor by circulating hot water under the floor, and in mild-air radiant heating, which gently warms the room by flowing hot water through radiating fins installed in the room. In this case, the temperature of the hot water to be circulated is not required to be very high, and hot water at a relatively low temperature of about 60° C. is usually used.

However, when starting heating, the circulation passage through which hot water flows (
If the object of heating (hereinafter referred to as the "load" including the floor and radiating fins) is cold, it may take a considerable amount of time to warm up the load by circulating low-temperature hot water.

This is because the temperature of the circulating water is low and the temperature difference between it and the load is small, so the flow of heat is slow when heat is exchanged from the hot water to the load.

Therefore, in order to increase the temperature difference between the circulating water and the load, it may be considered to increase the temperature of the circulating water, but there is a problem that the temperature of the load becomes too high after the load has sufficiently warmed up.

This invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a temperature control device that can quickly warm up a heating load and maintain the load at an appropriate temperature after heating.

Means for Solving the Problems> In order to achieve the above object, the temperature control device for a hot water circulation type heater of the present invention has a temperature control device for a hot water circulation type heater, which controls hot water at a temperature higher than a set temperature (hereinafter referred to as "high temperature water") immediately after the start of heating. The high temperature water circulation means circulates hot water (hereinafter referred to as "low temperature water"), and the low temperature water circulation means circulates hot water at a set temperature (hereinafter referred to as "low temperature water") after the high temperature water is circulated by the high temperature water circulation means.

According to the temperature control device having the above configuration, after heating starts, high temperature water is circulated, so the load can be quickly warmed up, and after the load is warmed, low temperature water is circulated,
The load can be maintained at the desired temperature.

<Example> Next, an example will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an outline of a hot water circulating gas instantaneous heater. The main body (1) of the hot water circulating gas instantaneous heater is provided with an internal ring waterway (2) for reheating water that has been circulated through loads such as floor heating. ) includes an expansion tank (3) for removing air bubbles generated from the circulating water and absorbing expansion and contraction of the circulating water in the inner circulating waterway 0;
A circulation pump (4) that circulates the circulating water and a heat exchanger (5) that provides heat to the circulating water are interposed, and the outlet of the internal ring waterway (where heated hot water exits the main body (1) Bypass pipe (where hot water that has passed through the load enters the main body (1)) short-circuits
6) An overflow pipe (20) and the like are provided to prevent the amount of water in the expansion tank (3) from exceeding a certain level.

On the other hand, as a gas heating system, a gas pipe (7) is provided to guide combustion gas from the outside, and in the middle of this gas pipe (7) there is a solenoid valve (8) that opens and closes the gas flow rate, and a proportional valve (8) that adjusts the gas flow rate.
10) and a gas burner (11) is attached to the terminal end of the gas pipe (7). (12) is a spark plug. Further, an exhaust pipe (13) having an intake port is provided above the flame port of the gas burner (11),
A heat exchanger (5) is installed at the back of the intake port. A temperature sensor (for example, a thermistor) (21) is attached to a predetermined position on the outside of the exhaust pipe (13) to detect a temperature rise due to flame leaking from the exhaust pipe (13). When detected, a control section (not shown) is operated to close the solenoid valve 8). Further, a forced exhaust fan (IB) is provided in the middle of the exhaust pipe (13), and the outlet of the exhaust pipe (13) is an exhaust port (18). Note that (17) is a motor that rotates the forced exhaust fan (16), and (19) is an air intake hole provided on the surface of the main body (1).

Two temperature sensors (22) (23) are installed at the outlet of the heat exchanger (5) of the internal ring waterway (2).
is provided. The temperature sensor (22) operates at a high temperature of 100°C or higher, and for example, operates when the amount of circulating water becomes abnormally low and the temperature of the internal ring waterway (■) rises abnormally. ) detects a temperature rise, the control unit (not shown) operates to close the solenoid valve [F].
) is closed. Temperature sensor (23) is heat exchanger (5)
The temperature of the circulating water is detected and used for temperature control.

FIG. 2 is a block diagram showing the electrical configuration of the temperature control device in the hot water circulating gas instantaneous heater. The temperature control device consists of a microcomputer (24) and a controller (
25), a temperature sensor (23), a proportional valve (10), a solenoid valve [F]), and a circulation pump (4).

The controller (25) determines where the load is installed in the building (for example, in the reception room when the heated floor is located in the reception room).
It consists of a heating switch that starts heating, a pilot lamp, etc.

The microcomputer (24) is the controller (25)
A predetermined judgment is made based on the operation start signal from the temperature sensor (23) and the temperature detection signal from the temperature sensor (23), and if necessary, a drive signal is sent to the circulation pump (4) and the proportional valve (1
0), or send a gas amount adjustment signal to the solenoid valve (f3
), it is possible to control the circulating water to maintain it at a set temperature by sending a gas opening/closing signal. In this case, the microcomputer (24) does not immediately start temperature control based on a temperature of about 60°C after turning on the heating switch, but maintains a high temperature of about 80°C for a certain period of time after turning on the heating switch. Performs high temperature control to circulate water. These temperature control procedures will be explained below.

High temperature control is control performed to quickly warm up the load at the start of heating operation. FIG. 3 is a flowchart showing the high temperature control procedure, etc. When it is confirmed in step S1 that the heating switch is turned on, a timer is started in step S2, and high temperature control at 80° C. is started in step S3.

The specific details of the high temperature control will be explained using FIG. 4. Fourth
The figure is a graph with the combustion amount on the vertical axis and the temperature detected by the temperature sensor (23) on the horizontal axis.
10) and the solenoid valve (8) are fully opened and heated. Then, the temperature rises from the starting position ST point in the figure and reaches the reference temperature (80° C.) for high temperature control (point a). Thereafter, when the temperature rises, the proportional valve (10) is operated in the closing direction. As a result, when the temperature drops, the proportional valve (10)
The temperature of the circulating water rises and falls in a temperature range slightly higher than the reference temperature. This state is indicated by area b on the graph. The combustion loop in which the electromagnetic valve (8) is fully opened and the gas amount is adjusted by the proportional valve (10) as described above is referred to as a strong twist firing loop.

If the temperature continues to rise even if you throttle down the proportional valve (10) due to low water volume, etc., and reaches the boiling prevention temperature (88°C) (0 points), close the proportional valve (10) and Valve (8) is also closed. (Point d). Then the temperature begins to drop. When the temperature drops to the combustion restart temperature (70°C) (point e), the solenoid valve (8) is opened and the gas is ignited (point f).
. A combustion loop in which the proportional valve (10) is closed and the gas amount is adjusted only by opening and closing the solenoid valve (8) is called a weak combustion loop. Determine whether the temperature will rise or fall after this,
If the temperature decreases (point g), turn on the proportional valve (10).
Fully open the heat to the h point) and move on to the strong twist firing loop. If the temperature rises from point f, control using the weak combustion loop continues.

After executing the high temperature control as described above, when the timer counts the passage of a predetermined time (for example, 30 minutes) in step S4 of FIG. 3, the process moves to step S5 and the microcomputer (24) enters a low temperature control procedure. The low temperature control is then continued until the heating switch is turned off in step S6. The low temperature control procedure is carried out in exactly the same way as the high temperature control procedure described above, except that the temperature is relatively low as shown in FIG. 5, so a description thereof will be omitted.

FIG. 6 is a graph comparing the load temperature changes when high temperature control is performed before low temperature control and when high temperature control is not performed. In the graph, curve 11■ is the temperature sensor (23
) represents the temperature of the circulating water detected, and the curve iSi represents the temperature of the load. The curve IS i represents the temperature transition when high temperature control is performed before low temperature control, and the curve 2, i represents the temperature transition when only low temperature control is performed from the beginning. If you perform high temperature control after heating starts,
The temperature of the circulating water rapidly rises to a high temperature (80°C) as shown by curve I, and at the same time, the temperature of the load also relatively quickly reaches the desired temperature (60°C) as shown by curve i.

If high temperature control is not performed, the temperature of the circulating water will only rise to 60℃ as shown by curve
It takes time to reach ℃ (curve i). In this way, by performing high temperature control after turning on the heating switch and before performing low temperature control, it is possible to quickly warm up the load.

In addition, in the above procedure, the heating switch is turned on, high temperature control is executed, and then switching to low temperature control after a certain period of time, but when switching from high temperature control to low temperature control, the temperature of the circulating water is higher than the set temperature. It may be possible to switch to low-temperature control on the condition that the temperature (for example, 80° C.) is reached.

FIG. 7 shows an internal structural diagram of a hot water circulation type heater to which such a control procedure can be suitably applied.゛Water hot water circulation type heaters heat and generate high-temperature water using a heat exchanger, circulate this high-temperature water to high-temperature loads such as hot air radiators, bath heaters, bathroom ventilation dryers, etc., and perform high-temperature heating.
This is a two-temperature hot water circulation type heater that can perform low-temperature heating by branching off a portion of the return hot water and circulating it to low-temperature loads such as soft floor heating panels and mild-temperature air radiators. In addition to the first temperature sensor that measures the temperature of the hot water generated by heating, the system is equipped with a second temperature sensor that measures the temperature of the returned hot water.

To explain its general structure, the two-temperature hot water circulation type heater body (31) includes a high temperature water supply header (55), a low temperature water supply header (56), and a common hot water recovery header for high temperature and low temperature water. A header (57) is provided. Thermal valve (58) regulates the circulating water passing through the low temperature water supply header (56).
a) to (56c), thermal valves (56a) to
(58c) is driven by a microcomputer (6), which will be described later.
3) enables control.

The high-temperature water supply header (55) has a bath heater (71), a bathroom ventilation dryer (72), etc. as high-temperature loads connected to a valve (55).
5a) and a low temperature water supply header (
56) has a soft floor heating panel (7) as a low-temperature load.
3), the slightly warm air radiator (74) etc. are connected to each thermal valve (58a) ~
(56c). Recovered water from each load is collected through a hot water recovery header (57).

Inside the heater body (31) is a hot water recovery header (5).
Internal circulation waterway (3) for heating the hot water collected from
2), and the internal circulation waterway (32) passes through an expansion tank (33) for absorbing fat expansion and contraction of the circulating water, a circulation pump (34), and a heat exchanger (35). It is connected to the water supply header (55) and immediately downstream of the part where the circulation pump (34) is located.
A branch section (58) for directly supplying some circulating water to the low temperature water supply header (56) without passing through the heat exchanger (35).
), and part of the circulating water is separated from the branch part (58) and supplied from the low temperature water supply header (56). (59) is a temperature sensor (referred to as a second temperature sensor) provided at the entrance of the branch portion (58). Also,
High temperature water supply header (55) and hot water recovery header (57)
) is provided with a bypass pipe (36) of a predetermined inner diameter. The inner diameter of the bypass pipe (3B) is such that it bypasses a predetermined amount of high-temperature water during low-temperature heating and is connected to the low-temperature water supply header (5B).
The thickness is set to be enough to sufficiently raise the temperature of the hot water supplied from B). (50) is an overflow pipe.

On the other hand, a gas pipe (37) is provided to guide combustion gas from the outside, and a solenoid valve (38) and a proportional valve (40) are interposed in the middle of this gas pipe (37). A gas burner (41) is attached to the terminal end of the (42)
) is a spark plug. An intake port of an exhaust pipe (43) faces the flame port of the gas burner (41). Heat exchanger (3
5) is provided at the back of the intake port, and a temperature sensor (51) is attached to a predetermined position outside the exhaust pipe (43) to detect a temperature rise due to flame leaking from the exhaust pipe (43). When the temperature sensor (51) detects a temperature rise, it operates a control section (not shown) to close the solenoid valve (38). Further, a forced exhaust fan (4B) is provided in the middle of the exhaust pipe (43), and the outlet of the exhaust pipe (43) is an exhaust port (48). Note that (47) is a motor that rotationally drives the forced exhaust fan (46), and (49) is an air intake hole provided on the surface of the main body (31).

Of the internal circulation waterway (32), two temperature sensors (52) (5
3) is provided. Temperature sensor (52) is 100
It operates at a high temperature of 'C or higher, and operates, for example, when the amount of circulating water becomes abnormally low and the temperature of the internal circulation waterway (32) rises abnormally. On the other hand, the temperature sensor (5
3) (referred to as a first temperature sensor) detects the temperature of the circulating water that has passed through the heat exchanger (35) and serves for temperature control.

FIG. 8 is a block diagram showing the electrical configuration of a temperature control device applied to the two-temperature hot water circulation type heater. The temperature control device includes a microcomputer (63), a high temperature controller (61), and a low temperature controller (a2a) (8
2b)-1 First temperature sensor (53), second temperature sensor (
59), a proportional valve (4o), a solenoid valve (38), a circulation pump (34), etc. The high temperature controller (61) is connected to the bath heater (71) and the bathroom ventilation dryer (72).
), etc., and is placed somewhere in the building, and is equipped with a heating switch to start heating, a pilot lamp, etc. Low-temperature controllers (82a) (82b)... are for controlling low-temperature loads such as soft floor heating panels (73) and low-temperature air radiators (74), and are installed at each location where each low-temperature load is installed. . For example, if there are five rooms and each room has floor heating, there will be five low temperature controllers installed in each room. The microcomputer (63) receives the operation start signal from the high temperature controller (61) or the low temperature controller (82a) (82b
) ... operation start signal, temperature sensor (53) (
59), and sends a drive signal to the circulation pump (34) and, if necessary, sends a gas amount adjustment signal to the proportional valve (40). The circulating water is controlled to be maintained at a predetermined set temperature by sending a gas opening/closing signal to the electromagnetic valve (38).

That is, a bath heater (71), a bathroom ventilation dryer (52)
), etc., the microcomputer (63) receives an operation start signal from the high temperature controller (61) and activates the thermal valves (58a) to (58a) of the low temperature water supply header (56). 56e) and open the valve (55a) of the high temperature water supply header (55).
34) to circulate water, and at the same time, based on the detection output of the first temperature sensor (53), a gas amount adjustment signal is sent to the proportional valve (40) based on 80°C as necessary. The heating of the circulating water can be controlled by sending a gas opening/closing signal to the electromagnetic valve (38). In this manner, heating of a high-temperature load in the above two-temperature hot water circulation type heater is performed by keeping the temperature of hot water supplied to the high-temperature water supply header (55) constant.

The specific details of the high temperature control are the same as those already explained using FIG. 4, so the explanation will be omitted.

In addition, when the operation start signal from the high temperature controller (B1) and the operation start signal from the low temperature controllers (82a) (82b)... conflict, the high temperature controller (61) is given priority and the second temperature sensor (59 ) is controlled based on the temperature detected by the first temperature sensor (53). In this case, use the low temperature water supply header (5
The thermal valves (56a) to (58e) of 6) and the valve (55a) of the high temperature water supply header (55) are connected to the first
The heat exchanger (3) is activated based on the detection output of the temperature sensor (53).
5) to circulate hot water. Then, high-temperature water is supplied to the high-temperature load, and a portion of the hot water recovered from the high-temperature load is sent to the heat exchanger (58) via the branch section (58).
35), and the other part flows toward the low temperature load through the low temperature water supply header (56). In this case, although no control is performed based on the detection output of the second temperature sensor (59), the temperature of the hot water recovered from the high-temperature load is absorbed by the load and decreases slightly, so the temperature is almost appropriate for the low-temperature load. can supply hot water.

Next, we have a soft floor heating panel (73) and a mild air radiator (73).
A case in which hot water is supplied only to low-temperature loads such as 4) will be explained. Low temperature controller (82a) (62b)...
・When you operate the low temperature controller (82a) (62
b) A low temperature operation start signal from... is input to the microcomputer (63). Then, the microcomputer (63) activates the valve (5) of the high temperature water supply header (55).
5a) and close the thermal valve (56) of the low temperature water supply header (56).
Circulation pump (34) with 58a) to (56c) open
) to circulate hot water. Then, a part of the circulating water discharged from the circulation pump (34) flows into the branch part (5).
8) directly to the load through the low temperature water supply header (56). Further, the remainder of the circulating water discharged from the circulation pump (34) enters the heat exchanger (35), where it is heated and returns to the circulation pump (34) through the bypass pipe (36).

The above-mentioned low-temperature control is performed not by a first temperature sensor (53) located far from the low-temperature water supply header (56), but by a second temperature sensor provided at a branch part (58) near the low-temperature water supply header (5B). It is preferable to perform this based on the detection signal of the sensor (59) in order to accurately maintain the temperature of the circulating water coming out of the low temperature water supply header (56) at a low temperature setting of about 60°C.

However, if the load is cold when heating starts, circulating low-temperature hot water may take a considerable amount of time to warm up the load. This is the second temperature sensor (5
9), the temperature of the hot water supplied to the low-temperature water supply header (56) is relatively low (60°C), and the temperature difference between it and the load temperature (room temperature) is small, so heat is exchanged from the hot water to the load. This is due to the fact that the amount of heat transferred is small.

Therefore, the microcomputer (63) does not start low temperature control immediately after turning on the heating switch.
After the heating switch is turned on, the hot water is kept at a temperature of about 80°C based on the temperature detected by the first temperature sensor (53) until the second temperature sensor (59) detects that the returned water temperature has reached 60°C. The temperature is controlled to circulate. This temperature control procedure will be explained below.

FIG. 9 is a flowchart showing the temperature control procedure, etc. When it is confirmed in step Sll that the heating switch is turned on, high temperature control at 80° C. is started in step SL2. The circulating water coming out of the heat exchanger (35) passes through the bypass pipe (36) and reaches the branch part (58).
It is supplied to the load through a low temperature water supply header (56). The temperature of the hot water supplied from the low temperature water supply header (5B) is determined by setting the inner diameter of the bypass pipe (36) to a predetermined thickness.
Since a large amount of high-temperature water heated by the heat exchanger (35) can be bypassed, the temperature of hot water (60°C) supplied from the low-temperature water supply header (56) during low-temperature load heating is reduced.
It is high compared to In step 313, wait until the temperature of the return hot water supplied from the low temperature water supply header (56) to the load (the temperature detected by the second temperature sensor (59)) reaches the low temperature set temperature (60°C), When the second temperature sensor (
Enter the temperature control procedure based on 59). This control is continued until the heating switch is turned off in step S15.

As described above, by performing temperature control based on the first temperature sensor (53) before performing temperature control based on the second temperature sensor (59) after turning on the heating switch, it is possible to quickly warm up the load. can. When the detected temperature of the second temperature sensor (59) reaches the low-temperature setting temperature, control is started based on the second temperature sensor (59), and after that, the temperature of the hot water circulating through the low-temperature load is accurately adjusted to a low temperature. Can be maintained at the set temperature.

In addition, in this example of the two-temperature hot water circulation type heater,
When the temperature detected by the second temperature sensor (59) reaches the low temperature set temperature, control is started based on the second temperature sensor (59), but the temperature detected by the second temperature sensor (59) is not monitored. Alternatively, as in the embodiments shown in FIGS. 1 to 3, after turning on the heating switch, wait for a predetermined time to elapse and then shift to control based on the second temperature sensor (59). According to this, even if the temperature of the return hot water reaches the low temperature setting temperature, the first temperature sensor (53
), the low-temperature load can be sufficiently warmed, and especially when the room is cold and the sensible temperature is low, a sufficient heating effect can be obtained.

Next, the temperature control procedure after shifting to control based on the second temperature sensor (59) will be explained in detail.

When heating low-temperature loads, use the low-temperature water supply header (5
When a large number of low-temperature loads are connected to B), some of the hot water recovered from the hot water recovery header (57) is transferred to the heat exchanger (5).
Since the amount of circulating water that enters decreases, the amount of hot water flowing through the heat exchanger (5) decreases, and the heat exchanger (5) and the like tend to overheat. However, since the control is based on the second temperature sensor (59), even if the temperature of the hot water flowing through the heat exchanger (5) rises, the response is slow because the control is based on the temperature of the returning hot water.
It often happens that there is a delay in detecting this, resulting in continued heating due to gas combustion. At this time, the hot water flowing through the heat exchanger (5) is heated to just before boiling, creating a dangerous situation.

Therefore, after shifting to control based on the second temperature sensor (59), the following temperature control procedure is executed to improve the safety of the heater.

That is, the microcomputer (63) continues to monitor the temperature detected by the first temperature sensor (53) even after shifting to control based on the second temperature sensor (59), and the microcomputer (63) continues to monitor the temperature detected by the first temperature sensor (53). When the temperature exceeds the boiling prevention temperature, control based on the second temperature sensor (59) is stopped and control is shifted to control based on the first temperature sensor (53).

FIG. 10 is a flowchart showing the above control procedure,
In step S21, control by the second temperature sensor (59) (
When a low-temperature operation start signal is input from another low-temperature controller (62a) (82b), etc. while the control temperature is 60°C), the input controller (82a), (62b), etc. Because the cold water in the circulating water passage corresponding to ... flows into the expansion tank (33),
The temperature detected by the second temperature sensor (59) begins to drop.

On the other hand, since the amount of hot water flowing into the low-temperature load increases, the amount of hot water flowing through the heat exchanger (35) further decreases.

Therefore, heat exchanger (35) and heat exchanger (35)
The temperature of nearby waterways may rise to just below boiling point, creating a dangerous situation. In such a case, when the detected temperature of the first temperature sensor (53) reaches the boiling prevention temperature (88°C) (step 522), the control is switched to the control by the first temperature sensor (53) (control temperature 80°C) (step 523
). This reduces the combustion amount or turns the combustion to 0FF.
L, we will now switch to the weak combustion loop. As a result, the temperature of the hot water flowing into the expansion tank (33) temporally decreases, and the temperature detected by the second temperature sensor (59) decreases. However, by executing temperature control that shifts to a strong combustion loop when the detected temperature of the first temperature sensor (53) becomes, for example, 66°C or lower, the temperature of the hot water supplied to the load is set to the low temperature setting temperature (60°C). gradually rises to When the detected temperature of the second temperature sensor (59) reaches the low temperature set temperature (60° C.) in step S24, control by the second temperature sensor (59) is resumed.

In this way both temperature sensors (53) (59)
By constantly monitoring both of
℃), the control returns to the second temperature sensor (59) again, and the temperature of the hot water circulating through the low-temperature load can be maintained accurately.

<Effects of the Invention> As described above, according to the temperature control device for the hot water circulation type heater of the present invention, after heating starts, high temperature water is circulated by the high temperature water circulation means, and after circulating the high temperature water, low temperature water circulation is started. Since the low-temperature water is circulated by the means, the load can be quickly warmed up after heating starts, and after the load has warmed up, the low-temperature water can be circulated to keep the load at a desired temperature. Therefore, it is possible to eliminate the conventional inconvenience that the load does not warm up easily after heating starts.

[Brief explanation of the drawing]

Fig. 1 is a schematic internal structure diagram showing an embodiment of the temperature control device in the hot water circulation type heater, Fig. 2 is a block diagram showing the electrical configuration of the temperature control device in the hot water circulation type heater, and Fig. 3 is a flowchart showing the temperature control procedure, Fig. 4 is a graph showing the high temperature control temperature control cycle, Fig. 5 is a graph showing the low temperature control temperature control cycle, Fig. 6 is the case where high temperature control is performed before low temperature control. Figure 7 is a schematic diagram showing the internal structure of the two-temperature hot water circulation type heater, and Figure 8 is the above two-temperature hot water circulation type heater. A block diagram showing the electrical configuration of the temperature control device in the machine, and FIGS. 9 and 10 are flowcharts showing the temperature control procedure of the temperature control device. (24) (83) ...Microcomputer that constitutes high-temperature water circulation means and low-temperature water circulation means Patent applicant Tokyo Gas Co., Ltd. Sanyo Electric Co., Ltd. Tottori Sanyo Electric Co., Ltd. Figure 3 Time (minutes) Figure 7 Figure 8

Claims (1)

[Claims] 1. A hot water circulation type heater that circulates hot water at a set temperature for heating, comprising: a high-temperature water circulation means that circulates hot water at a temperature higher than the set temperature immediately after heating starts, and a high-temperature water circulation means. 1. A temperature control device for a hot water circulation type heater, comprising: low temperature water circulation means for circulating hot water at a temperature higher than the set temperature and then circulating hot water at the set temperature.