Orion System Water Source Heat Pump Module Tulsa - Manual (Page 12)

Water Source Heat Pump Module
Technical Guide 12
Sequence of Operation
Stand-Alone Input Commands
Compressor On/Off
A 24 volt signal to Binary Inputs #1-4 initiates each Compressor’s On
function. The source for this signal would typically come from Y1 to
Y4 calls from the thermostat.
Heat Enable On/Off
A 24 volt signal on this input indicates the unit is in the Heating Mode.
Typically, the source for this signal is the “O” call from the thermo-
stat.
Water Proof of Flow System On/Off
A 24 volt signal to Binary Inputs #6-7 indicates Water Proof of Flow
for each system.
Suction Pressure Analog Inputs
Sensors from Analog Inputs #1-4 correlate with the Suction Pressure of
each Compressor (250 PSI).
Leaving Water Temperature Thermistor Inputs
T1 correlates with Compressors A1 & A2 (RLY1 and RLY2). T2 cor-
relates with Compressors B1 & B2 (RLY3 and RLY4).
Input Commands (VCM-X WSHP or SA
Connection)
NOTE: When the term “ON” is used, it means there is either 24
VAC on the appropriate Binary Input or a call-to-run
signal is being received from the VCM-X WSHP or SA
Controller. When the term “OFF” is used, it means there
is either 0 VAC on the appropriate Binary Input or the
call-to-run signal from the VCM-X WSHP or SA has
been removed.
Compressor On/Off
Instead of a physical input signaling the Compressor On/Off function,
the VCM-X WSHP Controller or SA Controller communications drives
the Compressor On/Off function.
Heat Enable On/Off
As with the Compressor On/Off function, the VCM-X WSHP or SA
Controller communicates to the Module that it is in Heat Mode.