Orion System Water Source Heat Pump Module - Manual (Page 11)

Technical Guide
Water Source Heat Pump Module
11
Sequence of Operation
Table 2: Water Source Heat Pump Module Inputs &
Outputs
General
The following inputs and outputs are available on the Water Source Heat
Pump Module. See Table 2 below to reference the Input/Output Map.
Binary Inputs
1 Circuit A, 1 st Compressor Enable (BIN 1)
2 Circuit A, 2 nd Compressor Enable (BIN 2)
3 Circuit B, 1 st Compressor Enable (BIN 3)
4 Circuit B, 2 nd Compressor Enable (BIN 4)
5 Cool Enable (BIN 5)
6 Water Proof of Flow (BIN 6)
Analog Inputs
1 Suction Pressure Circuit A (Pres 1)
2 Not Used
3 Suction Pressure Circuit B (Pres 3)
4 Not Used
5 Leaving Water Temperature (T1)
Analog Outputs (1-5 VDC)
1 Circuit A - Digital Compressor A1 (AOUT1)
2 Circuit B - Digital Compressor B1 (AOUT2)
NOTE: Analog Outputs are not used on Stand Alone
Application
Relay Outputs (24 VAC)
1 Circuit A, 1 st Compressor Enable Output (RLY1)
2 Circuit A, 2 nd Compressor Enable Output (RLY2)
3 Circuit B, 1 st Compressor Enable Output (RLY3)
4 Circuit B, 2 nd Compressor Enable Output (RLY4)
5 Alarm Output (RLY5)
Table 3: Factory-Set Default Setpoints - Water Only
Default Setpoints
Description Setpoint
UNSAFE SUCTION 40 PSIG
LOW SUCTION HEAT MODE 100 PSIG
LOW SUCTION COOL MODE 100 PSIG
LOW LEAVING WATER TEMP 37ºF
Water Source Heat Pump Module
Setpoints
The Water Source Heat Pump Module setpoints are preset at AAON
and are based on the unit’s design and type of coolant being used in the
water loop. See Tables 3 & 4 for default settings.
NOTE: These are default settings only. The setpoints may be
different based on the unit’s design and type of coolant
being used. For fi eld adjustment of these setpoints, you
must contact the AAON factory.
Glycol Default Setpoints
Description 20% Glycol 40% Glycol
UNSAFE SUCTION 40 PSIG 40 PSIG
LOW SUCTION HEAT MODE 77 PSIG 45 PSIG
LOW SUCTION COOL MODE 85 PSIG 85 PSIG
LOW LEAVING WATER TEMP 23ºF 0ºF
Table 4: Factory-Set Default Setpoints - Glycol
Revised 12/28/11