Installation manual

PREMIER INSTALLATION MANUAL

Duct System

An air outlet collar is provided on vertical top ﬂ ow units and all horizontal units to facilitate a duct connection. A ﬂ exible

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 duct-

work 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 airﬂ ow quietly and efﬁ ciently. To maximize sound attenuation of

the unit blower, the supply and return plenums should include an internal duct liner of ﬁ berglass or constructed of ductboard

for the ﬁ rst 10 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 airﬂ ow is a problem, the blower speed can be changed (refer to pages 16-17).

Water Piping

The proper water ﬂ ow must be provided to each unit whenever the unit operates. To assure proper ﬂ ow, use pressure/

temperature ports to determine the ﬂ ow rate. These ports should be located adjacent to the supply and return water con-

nections on the unit. The proper ﬂ ow 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 ﬁ ttings 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 ﬂ ush 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 rub-

ber seal is in the swivel connector prior to attempting any connection. The rubber seals are shipped attached to the water-

line. To make the connection to a ground loop system, mate the brass connector (supplied in CK4L and CK3L connector kit)

against the rubber gasket in the swivel connector and thread the female locking ring onto the pipe threads, while maintain-

ing the brass connector in the desired direction. Tighten the connectors by hand, then gently snug the ﬁ tting with pliers to

provide a leak-proof joint. When connecting to an open loop (ground water) system, thread any 1-inch MPT ﬁ tting (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.

All source water connections on commercial units are standard female pipe thread.

Never use ﬂ exible hoses smaller than 1-inch inside diameter on the unit. Limit hose length to 10 feet per connection.

Check carefully for water leaks.

Freeze Protection

Set the freeze protection switch SW2-2 on the printed circuit board for applications using a closed loop antifreeze solu-

tion to “LOOP”. On applications using an open loop/groundwater system (or closed loop no antifreeze), set this dip switch to

“WELL”, the factory default setting. (Refer to the Dip Switch Field Selection table on page 20.)

CAUTION: Be sure to remove the shipping material from the blower discharge before

connecting ductwork.