York HIDS006B21S Service Manual

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York HIDS006B21S Service Manual Manual pdf 142 page image

5-12 SM-18001-rev.1EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING5.4.1.4 Control by Field-Supplied Room Thermostat[ Input Setting: Code (01) (for Cooling), Code (02) (for Heating) ]In a case where a field-supplied room thermostat is used instead of the inlet thermistor of the indoor unit inorder to run/stop the compressor, connect wires as shown below.OperationCooling Operation: Compressor is ON by closing terminals 2 and 3 of CN3Compressor is OFF by opening terminals 2 and 3 of CN3Heating Operation: Compressor is ON by closing terminals 1 and 2 of CN3Compressor is OFF by opening terminals 1 and 2 of CN32TemperatureIncreaseThermostatCN332131Indoor Unit PCB3P ConnectorField-Supplied Room ThermostatExample: Room Thermostat Input (for Cooling) is set to terminals 2 and 3 of CN3Room Thermostat Input (for Heating) is set to terminals 1 and 2 of CN3NOTE:The contact capacity of a thermostatshall be DC12V and several mA. Select athermostat which makes and breaks thecontact with this capacity.( )NOTE:1. Make the wires CN3 as short as possible. Do not install the wires along the 220V power line. Installthem more than 12 in. (30cm) away from each other. (Intersecting them is acceptable.)If the wires are installed along the power line, comply with the following points to prevent noise.a. Pass either of the low voltage wire and 220V power line through a metal tube and ground one end.b. Use a shielded wire for a low voltage wire and ground one end.The maximum wiring length is 230 ft. (70m).2. When using this function, it is recommended that safety devices such as an electric leakage breaker orsmoke detector, etc., be used because this is an unattended function.3. For a thermostat, do not use a thermostat which uses mercury for a switch, because chattering is likely tooccur at ON/OFF.4. Use a thermostat with a differential of 2oF (1.5oC) or more.5. Comply with the following points. If not, a high-voltage circuit breaker is activated or the unit repeatsON/OFF operation.a. Install a thermostat where air inlet temperature can be detected correctly.b. Install a thermostat where discharge air from the unit does not blow directly against it.6. When using a room thermostat, set each room thermostat (for cooling and heating) correctly. If any ofthem are set incorrectly, the other room thermostats do not operate.