Northern Heatpump NorthStar RD-WE-096 Installation & Operating Instructions Manual - page 13
08/19/2014
11
NI701
Mechanical Installation Source Water
WARNING
LOOP DESIGN IS EXTREMELY IMPORTANT FOR PROPER HEAT PUMP OPERATION.
INCORRECT LOOP DESIGN WILL REDUCE HEAT PUMP EFFICIENCY, CAUSE POOR
PERFORMANCE OR MAY RENDER THE SYSTEM UNUSABLE. CONTACT AN IGSHPA OR
CGC CERTIFIED GEOTHERMAL LOOP CONTRACTOR FOR PROPER INSTALLATIONS.
Water Connections General
The following pages outline typical piping arrangements for the most common source water connection options,
as well as flushing and filling procedures and antifreeze requirements for closed loop systems. Do not connect
copper piping directly to the source water connection points on this unit. A section of flexible piping is
recommended to reduce and isolate vibrations transmitting from the compressor into other parts of the system.
This manual covers wide range of heat pump capacities. As a result water connections show one representative
cabinet size. Exact water connection locations and size vary based upon these ranges, (2-1/2 ton – 4-ton), (5 – 6
ton), and (8 – 12 ton). See product dimension pages at the beginning of the manual for exact location and pipe size.
Once closed loops are completed, they must be pressure tested to at least 60 PSI to insure integrity. Once
pressure is tested, loop must be purged of all foreign debris and filled with fluid. All air must be removed at this
time by flushing the system. (Table 2) shows approximate fluid volumes.
Flow Switch – depending upon the model series and size the mounting and field installation requirement
differs.
RA-WE-030, 036, 050 – factory mounted internal and provided complete
RA-WE-060, 072 – loose kit, field installed external, wired to ICM board (see diagram below)
RD-WE Series – loose kit, field installed external, wired to ICM board (see diagram below). Also, an
adapter is required for 8-12 ton models. 8-12 ton models have 1-1/2” MPT ports, therefore a field provided
coupling is required to attach the 1-1/4” flow nipple to 8-12 ton models. The flow switch itself is directional
and must be installed facing the correct direction.
Note: The directional arrow is located at the top of the switch and must be pointing toward the heat pump.
Product warranty is void if this flow switch is not installed.