Module Power and Miscellaneous I/O
74 RTHC-SVD01B-EN
J5-1, 2 External Auto Stop open: 20.6 VDC unreg -stopped
closed: 0 VDC - normal
Must be jumpered if feature is not used
J5-3, 4 Emergency Stop open: 20.6 VDC unreg -stopped
closed: 0 VDC - normal
Must be jumpered if feature is not used
J5-5, 6 Outdoor Air Temp. Sensor Refer to Temperature Sensor Checkout
J6-2,1 Oil Return Gas Pump Drain Sol
Valve and Coil:
Solenoid is energized in inverse to 4L1 above.
This valve opens a line to the high pressure in
the condenser and causes the chamber to flush
out its refrigerant oil mixture and return it to the
compressor suction.
J7-11,12 External Base Load Setpoint
Analog Input
Customer Connected 2-10 Vdc or
4-20-mA Input
J8-2,1 Slide Valve Load Solenoid
Valve and Coil
Solenoid is pulsed allowing high pressure gas
into slide valve piston, causing slide valve to
move toward loaded position.
J9-3,4,5 Oil Loss Level Sensor Non contact, binary, optical sensing of liquid
level. Used for compressor oil loss/oil flow
protection.
Red: 24 VDC supply, Grn: Vout low=liquid,
high=No liquid, Blk: Gnd
J10-2,1 Slide Valve Unload Solenoid
Valve and Coil
Solenoid is pulsed allowing gas in slide valve
piston to vent to suction causing slide valve to
move toward unloaded position.
J12-1, 2 Chilled water pump starter
(N.O. contact)
Dry SPST contact closes when chilled water
demand switch closes, opens after time delay
specified in UCP2 Evap Pump Off Delay
specified under the Service Settings Menu.
J14-1, 2 Condenser water pump starter
(N.O. contacts)
Dry SPST contact closes when call for cooling
is established. Contact opens on compressor
shutdown.
J16-3, 2,1 Programmable Relay Output #1 Customer programmable annunciation Relay
J18-3, 2,1 Programmable Relay Output #2 Customer programmable annunciation Relay
Table 13-3: Chiller Module Nominal Terminal Input and Output (1U1)
Terminal
Designation
Description of Circuit
Normal Terminal Voltages for Various
Conditions
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