Control By Field-Supplied Room Thermostat - Hitachi RPI-0.8FSG1 Service Manual

OPTIONAL FUNCTION
(4.1 Indoor Unit)

4.1.4 Control by Field-Supplied Room Thermostat

In the case that a field-supplied room thermostat instead of the inlet thermistor of the indoor unit is used,
connect wires as shown below. The required parts are shown in Table 4.2.
Turn OFF the power source before setting the dip switch.
3P Connector
Indoor Unit PCB
Operation
Cooling Operation:
Heating Operation:
Component
Thermostat
NOTES:
1. When a field-supplied room thermostat is used, select the specified thermostat as below.
Contactor Load:
Differential: more than 1.5 degree
(*) Only for RPK (After Alteration): DC 12V
2. Do not use a thermostat utilizing mercury.
3. This function can be used together with "4.1.1 Remote Control ON/OFF Function".
4-6
3
2
1
CN3
3
2
1
Field-Supplied Room Thermostat
Compressor is ON by closing terminals 2 and 3 at CN3
Compressor is OFF by opening terminals 2 and 3 at CN3
Compressor is ON by closing terminals 1 and 2 at CN3
Compressor is OFF by opening terminals 1 and 2 at CN3
Table 4.2 Specifications on Required Components
Equivalent of YAMATAKE R7031P005, R7031Q005
DC24V 50 to 6 mA (*)
Thermostat
Temperature
Indoor Unit
Increase
Set No.3 at ON side.
1
Manufacturer or Specifications
DSW2
ON
OFF
2 3 4 5 6 7 8