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When connecting to an open loop (ground water) system, thread
any 1-inch MPT fitting (SCH80 PVC or copper) into the swivel
connector and tighten in the same manner as noted above. The
open and closed loop piping system should include pressure/
temperature taps for serviceability.

Never use flexible hoses smaller than 1-inch inside diameter
on the unit. Limit hose length to 10 feet per connection. Check
carefully for water leaks.

Duct System

An air outlet collar is provided on vertical top air discharge units
and all horizontal units to facilitate a duct connection. A flexible
connector is recommended for discharge and return air duct
connections on metal duct systems. Uninsulated duct should be
insulated with a minimum of 1-inch duct insulation. Application of
the unit to uninsulated ductwork in an unconditioned space is not
recommended as the unit’s performance will be adversely affected.

If the unit is connected to existing ductwork, check the duct
system to ensure that it has the capacity to accommodate the air
required for the unit application. If the duct is too small, as in the
replacement of heating only systems, larger ductwork should be
installed. All existing ductwork should be checked for leaks and
repaired if necessary.

The duct system should be sized to handle the design airflow
quietly and efficiently. To maximize sound attenuation of the unit
blower, the supply and return plenums should include an internal
duct liner of fiberglass or constructed of ductboard for the first few
feet. On systems employing a sheet metal duct system, canvas
connectors should be used between the unit and the ductwork. If
air noise or excessive airflow is a problem, the blower speed can
be changed.

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.

All source water connections on residential units are swivel piping
fittings (see Figure 4) that accept a 1-inch male pipe thread (MPT).
The swivel connector has a rubber gasket seal similar to a rubber
hose gasket, which when mated to the flush end of any 1-inch
threaded pipe provides a leak-free seal without the need for thread
sealing tape or compound. Check to ensure that the rubber seal
is in the swivel connector prior to attempting any connection. The
rubber seals are shipped attached to the waterline. To make the
connection to a ground loop system, mate the brass connector
(supplied in CK4LI connector kit) against the rubber gasket in
the swivel connector and thread the female locking ring onto the
pipe threads, while maintaining the brass connector in the desired
direction. Tighten the connectors by hand, then gently snug the
fitting with pliers to provide a leak-proof joint.