JPH03175229A - Control of oil heater - Google Patents

Abstract

PURPOSE:To minimize the power consumption of an oil heater by controlling the circuit of the oil heater by a microcomputer when an operation stops and minimizing the electrifying time of the oil heater in a timer starting operation mode. CONSTITUTION:When a power supply is supplied to a controller 1, an oil heater 6 is electrified and an oil in a compressor is warmed. When an air conditioner operating switch is closed, an output relay 11 for a blower and an output relay 12 for a compressor are closed, the contacts 3a and 5a of magnetic contactors are closed and the compressor 2 and the blower 4 are operated. Further, an output relay 14 for the oil heater is opened, and electrification of the oil heater 6 is stopped and the temperature of the oil in the compressor 2 is maintained by a high temperature refrigerant gas. The output relay 12 for the compressor is closed only when the temperature signal value of a room temperature thermistor 11 is higher than the set signal value of a room temperature setting device 9 and, in a reverse case, the output relay 12 for the compressor is closed and the output relay 14 for the oil heater is also closed whereby the compressor 2 is stopped and the oil heater 6 is electrified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of controlling an oil heater in an air conditioner.

[Conventional technology]

How to control the oil heater of a conventional air conditioner.

Hitachi Package Air Conditioner Service Manual NQPAH-
8902, PA8902, pages 6-4 and 6-6, the oil heater was in a energized state when the operation was stopped.

[Problem to be solved by the invention]

The above conventional technology does not take into consideration the control of the oil heater when the air conditioner is stopped for a long time, and the oil heater is always energized when the air conditioner is stopped for a long time. I was wasting electricity.

An object of the present invention is to minimize the power consumption of the oil heater, especially when the oil heater is stopped for a long time, by controlling the energization time of the oil heater.

[Means to solve the problem]

In order to achieve the above object, the present invention controls the oil heater circuit when the operation is stopped by a microcomputer.

In the timer start operation mode, the energization time of the oil heater is minimized.

[Effect]

The oil heater of the air conditioner is energized by the timer function of the microcomputer a certain period of time before the timer start operation time of the air conditioner. During this time, the oil in the compressor is warmed, so it can be restarted without forming.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The first drawing is a circuit diagram when the present invention is controlled by a microcomputer.

The circuit is control equipment engineering, compressor 2. Magnetic contactor for compressor 3.
Blower 4. Electromagnetic contactor S for blower, oil heater 6, air conditioner operation switch 7, operation selection switch 8. Room temperature setting device9. Operation start time setting device 10. Room temperature thermistor 11
．． Compressor output relay 12. Output relay for blower 13.
Consists of output rail 4 for oil heater.

The operation will be explained below. When power is supplied to the control device 1, the control device 1 closes the oil heater output relay 14, thereby energizing the oil heater 6 and warming the oil in the compressor. Next, when the air conditioner operation switch is closed, the contact signal closes the blower output relay 1 and the compressor output relay 12, and the compressor power contactor 3 and the blower electromagnetic contactor 5 are energized. As a result, the contacts 3a and 5a of each electromagnetic contactor are closed, and the compressor 2 and the blower 4 are operated.

Further, the oil heater output relay 14 is opened, the power supply to the oil heater 6 is stopped, and the oil temperature in the compressor 2 is maintained by the high-temperature refrigerant gas.

Here, the compressor output relay 2 is a room temperature thermistor 11.
It closes only when the temperature signal value of
The compressor 2 is stopped, and the oil heater 6 is energized.

Next, when the air conditioner is stopped, the operation selection switch 8 is set to OFF.
N, timer operation is selected and operation start time setting device 1
0, the time Ts until operation is set, and when the air conditioner operation switch 7 is closed, the compressor 2 opens the oil heater output relay 14 for a certain period of time Tc before starting operation, that is, (Ts - Tc), and the oil heater The power supply to 6 is stopped,
At time Tc before the start of operation, the oil heater output relay 14 is closed and energization to the oil heater 6 is started. Furthermore, when time Ts has elapsed due to the close signal from the air conditioner operation switch 7, the compressor output relay 12 and the blower output relay 13 are closed, and the compressor 2 and the blower 4 are operated.
Further, by opening the oil heater output relay 4, the supply of electricity to the oil heater 6 is stopped.

Figure 2 shows the O'N of the compressor and oil heater according to this embodiment.
It shows the relationship between -0FF timing chart and compressor oil temperature.

Since the oil temperature is at an appropriate temperature within the time Tc and the refrigerant dissolved in the oil is released to the outside of the oil, no forming occurs when the compressor is started.

Conventionally, the oil heater was continuously energized for the time Tc, but according to this embodiment, the oil heater is not energized for the (Ts-Tc) time, resulting in a power saving effect.

〔Effect of the invention〕

According to the present invention, the power supply to the oil heater is stopped for the time (Ts-Tc), so there is a power saving effect.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the present invention, and Fig. 2 shows the compressor and oil heater ○N-0FF timing chart (a) and compressor oil temperature state (b) according to the circuit of Fig. 1. It is a diagram.

Claims (1)

[Claims] 1. A method for controlling an oil heater in an air conditioner equipped with an oil heater, characterized in that when a timer is activated, the oil heater is energized a certain period of time before activation. 2. In an air conditioner equipped with an oil heater, the oil heater is turned off when the operation is stopped, and the time when the oil heater is energized is controlled according to the time until the restart time. How to control the heater.