Envision Peripherals Series - Manual (Page 10)

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NS SPLIT INSTALLATION MANUAL
Water Piping
Residential NS split units are supplied standard with GeoLink swivel connections with P.T. ports.
CAUTION: Water piping exposed to outside temperatures may be subject to freezing.
Water Piping
The proper water flow must be provided to each unit whenever the unit operates. To assure proper flow, use pressure/
temperature ports to determine the flow rate. These ports should be located at the supply and return water connections on
the unit. The proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerant-
to-water heat exchanger.
Closed Loop - Earth coupled Systems (Outdoor Installations)
Locate unit on an air pad with access hole as shown below. When mounting on an existing concrete pad, holes must
be bored through to accommodate 1 1/4-inch P.E. pipe with 1/2-inch insulation.
Connecting To Earth Loop
The earth loop trench should be continued directly under the unit as shown in Figure 4. Make the connections to op-
tional fittings from the loop circulator pump(s) and insure proper backfill to support the loop pipe during trench settling. All 1
1/4-inch piping should be insulated with a minimum of 1/2-inch closed cell insulation from below the ground surface to the
loop circulator.
IMPORTANT - A freeze sensing thermostat is installed in the unit to automatically start loop circulator
pump if loop temperature drops below 20°F. Loop freeze sensing should also be maintained to the
lowest temperature the insulated loop may encounter in the case of power failure.
Flow Center Installation
Flow centers FC1-GL or FC2-GL, as needed, may be
internally mounted on the NDS splits, Two stub tubes with
barbs are pre connected to the coax. Two tubes with brass
fittings, to adapt to the flow center, 2 hoses to connect
between the two sets of tubes, and four hose clamps are in-
cluded with each NDS unit. The brass adapter fittings have
plastic swivel connectors and are also internally threaded to
accept 1” NPT fittings.
NOTE: For ease of installation, attach provided hoses to
coax first and then trim to fit to elbows on flow center.
Loop Supply
and Return
Piping
Figure 4: Typical Split System Outdoor Installation Using
Closed Loop