Orion System SA Controller - Manual (Page 33)

SA Controller Technical Guide
Installation & Wiring
33
Water Source Heat Pump Protection Module Overview and Wiring
Figure 28: Water Source Heat Pump Protection Module to E-BUS Distribution Module Wiring Diagram
Water Source Heat Pump Protection
Module
The Water Source Heat Pump Protection Module (OE-334-23-WPM-A)
protects the compressors on an AAON Water Source Heat Pump unit
from damage by monitoring Suction Pressure, Leaving Water Tempera-
ture, and Water Proof of Flow. It also utilizes a Delay Timer to prevent
the compressors from turning on at the same time.
There is one water-only version of the Water Source Heat Pump Protec-
tion Module—the OE-334-23-WPM-A which uses R-410A refrigerant.
There are also two 410-A glycol versions—the OE-334-23-WPM-A20
which uses 20% glycol and the OE334-23-WPM-A40 which uses 40%
glycol.
NOTE: When using the WSHP Protection Module, the
compressors are wired to this module instead of the SA Controller
and SA Expansion Module.
The Water Source Heat Pump Protection Module connects to the SA
Controller ( OE332-23-SA) using the E-BUS Distribution Module
( OE365-23-EBD-A). This allows the Water Source Heat Pump Protec-
tion Module to receive control data and alarms from the SA Controller.
See Figure 28 below for wiring diagram.
The Water Source Heat Pump Protection Module requires a 24 VAC
power connection with an appropriate VA rating.
NOTE: For complete information, including the sequence
of operation, refer to AAON Tulsa’s Water Source Heat Pump
Protection Module Technical Guide.
Revised 10/18/10