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General Installation Information cont.
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
CAUTION: When attaching ductwork or
accessories to the cabinet, make sure the
fasteners do not come into contact with the
air coil.
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
DUAL COMPRESSOR PACKAGED HEAT PUMP INSTALLATION GUIDE
direction. Tighten the connectors by hand, then gently snug
the fitting with pliers to provide a leak-proof joint. 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.
Figure 4: Swivel Connections
Stainless
Steel
Snap Ring
Gasket
Material
11
Locking
Ring
Gasket
Support
Sleeve
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