JPH0484071A - Control device for heater - Google Patents

Abstract

PURPOSE:To perform an accurate room temperature control and prevent cold air from being blown by a method wherein a suction temperature thermistor is disposed near a hot water coil, a correction thermistor is disposed at a blowing port side, a thermo-valve is installed at a going auxiliary pipe of the hot water coil and a water temperature sensor is arranged at a downstream side of the thermo-valve and they are controlled at the controlling part. CONSTITUTION:Sensing of a room temperature is carried out by a method in which both signals from a suction temperature thermistor 8 and a correction thermistor 16 are received at a control part 6, the lower temperature is judged as a room temperature and so a controlling operation is carried out at the control part 6. In the event that a blower 5 is being operated, air flow is sucked through a suction port 2, so that the suction temperature thermistor 8 detects a correct room temperature. If a hot water coil 3 is at a high temperature and the blower 5 is stopped under a control of thermostat, a correct room temperature is detected by the correction thermistor 16, the signal is transmitted to the control part 6 and then ON/OFF of the thermostat is correctly controlled at the control part 6. Prevention of blowing cold air is carried out such that a temperature of the hot water coil 3 is detected by a water temperature sensor 13 during operation of the blower 5 and a blowing air temperature is detected by the correction thermistor 16, and then the control part 6 controls a blowing of the cold air while changing-over a notch of the blower 5 to 'strong', 'weak' and 'stop', respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to room temperature control and cold air prevention control in a heater.

BACKGROUND OF THE INVENTION In recent years, when heating using a heater, more precise room temperature control has become necessary.

For example, in this heating control, as shown in FIG.
A blower 5 is provided correspondingly. On the other hand, on the side of the hot water coil 3, a suction temperature thermistor 8 is provided which is connected to the control unit 6 and the signal line 7 and detects the temperature of the suction air. The boiler (
He is trying to connect the primary outgoing pipe 9a disposed from (not shown) and the secondary returning pipe 11a. The thermal valve 10
The thermal valve 10 opens and closes the valve by expanding wax inside thereof, and this opening and closing has a time lag of about one minute from the arrival of a signal. Further, the outgoing auxiliary pipe 9 has a signal line 12.
A water temperature sensor 13 connected to the control unit 6 via the water temperature sensor 13 is provided,
It is attached to the downstream side of the thermal valve 10 and detects water temperature. The thermal valve 10 is connected to the control section 6 via a signal line 14.

In this way, conventionally, high-temperature water from the boiler is passed through the outgoing auxiliary piping 9 to open the thermal valve 10, flows through the hot water coil 3, passes through the incoming auxiliary piping 11, returns to the boiler example, and is connected to the blower 5. By operating the , the air blower 5 is operated while detecting the room temperature using the suction temperature thermistor 8. If the indoor air becomes low, the air blower 5 is activated by the suction temperature thermistor 8, and when the indoor air rises, the air blower 5 is activated. When the temperature becomes weak and the indoor air rises further, the blower 5 stops. On the other hand, when the water temperature detected by the water temperature sensor 13 is low, the blower 5 stops, when the water temperature gradually rises, the blower 5 becomes weak operation, and when the water temperature rises further, the blower 5 becomes strong operation, and the suction temperature thermistor 8 There is a correlation with the water temperature sensor 13 in the control section 6, and the operation of the blower 5 is controlled and stopped.

Problems to be Solved by the Invention In such a conventional configuration, a problem occurs when the blower 5 is stopped. That is, when the blower 5 is stopped, indoor air flows from the outlet 4 by natural convection, and high-temperature water remains in the hot water coil 3, so the radiant heat from this high-temperature water causes the suction temperature thermistor 8 to accurately adjust to the room temperature. cannot be detected, and as a result, correct control, that is, restarting from a stop may not be automatically performed. Furthermore, if the construction contractor were to install the outgoing auxiliary piping 9 and the incoming auxiliary piping 1,
If you make a mistake and connect water temperature sensor 1 in the opposite way,
No. 3 functions to prevent cold air, but when the water temperature sensors are reversely connected, the 13 water temperature sensors become return auxiliary piping, and they no longer serve the purpose of preventing cold air.

The present invention solves these problems, and aims to provide a heater that accurately controls room temperature and prevents cold air.

Means for Solving the Problems In order to solve this problem, the present invention provides an outgoing auxiliary pipe and a return auxiliary pipe inside the main body, a hot water coil corresponding to the suction port, and a thermal coil on the outgoing auxiliary pipe side. a valve is provided, a blower is provided below the hot water coil in correspondence with the outlet; a suction temperature thermistor for detecting the temperature of the suction air is provided near the hot water coil and connected to a control unit via a signal line; A water temperature sensor for detecting water temperature is provided on the downstream side of the thermal valve and connected to the control unit via a signal line, and a water temperature sensor for correcting the suction temperature thermistor and the water temperature sensor is provided on the outlet side of the blower. The correction thermistor is connected to the control section via a signal line.

Effect With this configuration, the control unit detects the low temperature of the suction temperature thermistor and correction thermistor as the room temperature, so when the blower is in operation, the suction temperature thermistor detects the temperature, and when the blower is stopped, the temperature is detected by the suction temperature thermistor. When the air blower is in operation, the room temperature is detected by a correction thermistor, and the control unit controls the blower and thermal valve.When the blower is in operation, the temperature of the blowing air is detected by the correction thermistor, and the control unit controls the blower and thermal valve. When the blower is stopped, the water temperature sensor detects the coil humidity and controls the blower to prevent cold air from blowing out.

EXAMPLE An example of the present invention will be described below with reference to FIG. It should be noted that the numerals attached to the conventional example and the same numerals indicate the same thing, and the explanation will be omitted. That is, the signal line 7 is connected to the control unit 6.
A suction temperature thermistor 8 connected to the inlet temperature thermistor 8 and a water temperature sensor 13 attached to the outgoing auxiliary pipe 9 are connected to the control unit 6 by a signal line 12, and are also connected to the control unit 6 by a signal line 15. A correction thermistor 16 for controlling the valve 10 and the blower 5 is provided at the air outlet 4.

In the above configuration, when the operation switch is pressed, the air blower 5 starts operating through the control section 6 when the water temperature in the outgoing auxiliary pipe 9 becomes high due to the suction temperature thermistor and the water temperature sensor 13. In other words, the blower 5 remains stopped until the water temperature rises, thereby preventing cold air from being blown out. next,
After the blower 5 is operated, the air blower 5 is controlled via the control unit 6 by the suction temperature thermistor 8 and the water temperature sensor 13.
The notch is switched between strong, weak, and stopped, and the opening and closing of the thermal valve 10 is controlled. The room temperature is detected while performing such control, and the control unit 6 receives signals from both the suction temperature thermistor 8 and the correction thermistor 16, and determines whichever is the lower temperature as the room temperature. The control unit 6 performs control while making the determination. Therefore, when the blower 5 is operating, the air flow is sucked in through the suction port 2, so that the suction temperature thermistor 8 detects the correct room temperature. If the hot water coil 3 is at a high temperature and the blower 5 is stopped due to the thermostat, the indoor air from the outlet 4 will convect upwardly from below as natural convection, so the correction thermistor 16 will correct the room temperature. The sensor is detected and transmitted to the control unit 6, and the control unit 6 correctly controls the ON/OFF of the sensor.

To prevent cold air, suppose that while the blower 5 is in operation, the temperature of the hot water coil 3 is detected by the water temperature sensor 13, and the temperature of the blown air is detected by the correction thermistor 16. Controls the blowing of cold air by switching between strong, weak, and stop. Also, - next outbound pipe 9
If the construction builder mistakenly connects the primary recovery pipe 11a and the water temperature sensor 13 in the opposite way, the water temperature sensor 13 will detect the outlet water temperature of the hot water coil 3.
cannot detect accurate hot water coil temperature (inlet water temperature).

However, since the correction thermistor 16 detects the temperature of the blown air, the control unit 6 can correctly perform cold air prevention control.

In short, the blower 5 operates in stages of stop, weak, and strong, and the correction thermistor 16 is set by the control unit 6 to indicate that the temperature is room temperature when the value detected by the suction temperature thermistor 8 is low. If it is high, it is set in the control unit 6 that it is the blowing air temperature, and room temperature control is determined by the control unit 6 by comparing the suction temperature thermistor 8 and the correction thermistor 16. Regarding the cold air prevention control, the controller 6 makes a determination based on two values from the water temperature sensor 13 and the correction thermistor 16, and determines whether the blower 5 should be stopped, weak, or strong, and performs control. .

Effects of the Invention As is clear from the description of the above embodiments, the present invention includes a suction temperature thermistor in the vicinity of the hot water coil, a correction thermistor on the outlet side, and a thermal valve in the auxiliary piping for the hot water coil.
Since a water temperature sensor is installed downstream of this thermal valve and controlled by the control unit, the correction thermistor is used to accurately measure the room temperature in place of the suction temperature thermistor when the blower is stopped, both at the beginning of the blower operation and during operation. is transmitted to the control unit,
When the blower is in operation, the cold air prevention control is performed using the hot water coil temperature using the water temperature thermistor, and the correction thermistor uses the value of the blowing air temperature to perform accurate cold air prevention control. Even if connected, when the blower is in operation, the correction thermistor detects the blowing temperature, which has the effect of accurately controlling the prevention of cold air.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a control device for a heating machine according to an embodiment of the present invention, and FIG. 2 is a block diagram of a control device for a heater according to a conventional explanation. 1...Main body, 2...Suction port, 3...
...Hot water coil, 4...Blowout outlet, 5...
...Blower, 6...Control unit, 7.12.15.
...Signal line, 8...Suction temperature thermistor, 9...Outward auxiliary piping, 10...Thermal valve, 11...Return auxiliary Piping, 13...Water temperature sensor, 16...Correction thermistor.

Claims (1)

[Claims] A forward auxiliary pipe and a return auxiliary pipe are provided inside the main body, a hot water coil is provided corresponding to the suction port, a thermal valve is provided on the side of the forward auxiliary pipe, and a blower is provided below the hot water coil corresponding to the outlet. A suction temperature thermistor for detecting the temperature of the suction air is provided near the hot water coil and connected to the control unit via a signal line, and a water temperature sensor for detecting the water temperature is provided downstream of the thermal valve to generate a signal. A heating device connected to the control unit via a line, and a correction thermistor for correcting the suction temperature thermistor and the water temperature sensor on the outlet side of the blower, connected to the control unit via a signal line. control device.