7
7 SERIES 700A11 INSTALLATION MANUAL
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. 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 and rear
air discharge units and all horizontal units to facilitate
a duct connection (vertical bottomflow units have no
collar). 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 according to the table
below 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.
Model
Design Airflow
NV036
1500
NV048
1800
NV060
2100
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
Figure 4: Swivel Connections
Locking
Ring
Stainless
Steel
Snap Ring
Gasket
Support
Sleeve
Gasket
Material
General Installation Information cont.
