Orion System One Condenser Head Pressure Module - Manual (Page 11)

Technical Guide
One Condenser Head Pressure Module
11
Sequence of Operation
Table 1: One Condenser Head Pressure Module
Inputs & Outputs
Inputs and Outputs
The following inputs and outputs are available on the One Condenser
Head Pressure Module. See Table 1 below to reference the Input/
Output Map.
Binary Inputs
1 Condenser On/Off (24 VAC Wet Input)
2 Reversing Valve Enable (24 VAC Wet Input)
3 N/A
Binary Outputs
1
Condenser Enable Relay
(Dry Contact Output Rated for 24 VAC)
2
Reversing Valve Enable
(Dry Contact Output Rated for 24 VAC)
Analog Inputs
1 Head Pressure #1 (0-667 PSI Sensor)
2 Head Pressure #2 (0-667 PSI Sensor)
3 Head Pressure #3 (0-667 PSI Sensor)
4 Head Pressure #4 (0-667 PSI Sensor)
Analog Outputs
1 Condenser Signal (0-10 or 2-10 VDC)
2 N/A
PWM Output
1 ECM 142 PWM Output (0-100% Duty Cycle)
2 N/A
Stand-Alone Input Commands
Condenser On/Off
A 24 volt signal to Binary Input #1 initiates the Condenser Enable
function. Typically, the source for this signal is the “Y” call from the
thermostat calling for a compressor to run.
Reversing Valve Enable On/Off
A 24 volt signal to Binary Input #2 initiates the Reversing Valve has
been energized and initiates the Reversing Valve Enable On indication
function. Typically, the source for this signal is the “O” call from a
thermostat or other controller.
Head Pressure Setpoint
The Head Pressure Setpoint is set using the OPTIONS Dip Switches.
See Table 2. The Default Setpoint for an Air Cooled Condenser is 340
for 410-A refrigerant. The Default Setpoint for a Water Cooled Con-
denser is 235 for 410-A refrigerant. Set the OPTIONS Dip Switch to
0 if using these Default Settings. You must cycle power after setting
Dip Switch values.
NOTE: The only setpoint available for adjustment by the con-
tractor is the Head Pressure Setpoint. The rest of the
setpoints described can only be changed by the factory.
ADDRESS Dip Switch Settings Condenser Type
Selection
When using the OPTIONS Dip Switch to set the Head Pressure Setpoint,
you must also set the ADDRESS Dip Switch to designate the type of
condenser you are using.
Set ADDRESS Dip Switch 1 to ON for a Water Cooled Condenser or
to OFF for an Air Cooled Condenser.
If set to ON for a Water Cooled Condenser, the Analog Condenser Output
Signal will be 2-10 VDC for the Water Valve. If set to OFF for an Air
Cooled Condenser, the Analog Condenser Output Signal will be 0-10
VDC for the Condenser Fan.
You must cycle power after setting Dip Switch values. See Figure 5
for ADDRESS Dip Switch location and Table 3 for Setting information.