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

Technical Guide
Two Condenser Head Pressure Module
11
Sequence of Operation
Table 1: Two Condenser Head Pressure Module
Inputs & Outputs
General
The following inputs and outputs are available on the Two Condenser
Head Pressure Module. See Table 1 below to reference the Input/
Output Map.
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.
Cooling Enable On/Off
A 24 volt signal to Binary Input #2 initiates the Cooling Enable On
function. Typically, the source for this signal is the “O” call from the
thermostat. A signal on this input indicates indicates the reversing valve
has been energized and that the unit is in the
Cooling Mode.
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 Condenser
is 235 for 410-A refrigerant. Set the OPTIONS Dip Switch to 0 if using
these Default Settings. In addition, if using the Default Settings, you
must set the Address Dip Switch. See “ADDRESS Dip Switch” below.
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 for 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 6
for ADDRESS Dip Switch location and Table 3 for Setting information.
Binary Inputs
1 Condenser Fans A & B On/Off (24 VAC Wet Input)
2 Cooling Enable (24 VAC Wet Input)
Binary Outputs
1
Condenser A Enable Relay
(Dry Contact Output Rated for 24 VAC)
2
Cooling Enable
(Dry Contact Output Rated for 24 VAC)
3
Condenser B Enable Relay
(Dry Contact Output Rated for 24 VAC)
4
Cooling 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 (0-10 or 2-10 VDC)
1 Condenser Signal A (AOUT 1)
2 Condenser Signal B (AOUT 2)
PWM Output
1 ECM 142 PWM Input (0-100% Duty Cycle)
2 ECM 142 PWM Input (0-100% Duty Cycle)