9
NDS OUTDOOR SPLIT INSTALLATION MANUAL
Residential NDS 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 the Typical Split System Outdoor
Installation Using Closed Loop. Make the connections to
optional fittings from the loop circulator pump(s) and
ensure 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 detection thermostat is
installed in the unit to automatically start loop
circulator pump if loop temperature drops
below 20°F. Loop freeze detection should also
be maintained to the lowest temperature the
insulated loop may encounter in the case of
power failure.
Open Loop (Indoor Installations)
NDS Splits can be installed on an open loop system, but
only indoors. All NDS Splits are supplied with GeoLink
swivel connectors. The swivel connectors will also accept a
1 in. O.D. copper pipe (sweat) which can be connected in an
open loop system.
Loop Supply
and Return
Piping
Typical Split System Outdoor Installation
Using Closed Loop
Water Piping
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
included with each NDS unit. The brass adapter fittings
have plastic swivel connectors that also accept 1 in. O.D.
copper pipe (sweat).
NOTE:
For ease of installation, attach provided hoses to
coax first and then trim to fit to elbows on flow center.