WaterFurnace AT019D, Руководство по установке и обслуживанию

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4
PREMIER 2 SINGLE-SPEED INSTALLATION AND MAINTENANCE MANUAL
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 repairs.
The duct system should be sized to handle the design airflow quietly. Due to increased run
time at lower airflows, the Premier 2 diffusers should be sized for 75% of design airflow. 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. If air noise or excessive airflow is a problem, the blower speed can be changed (see the
Blower Speed and Blower Performance sections on pages 19 and 20).
WATER PIPING
All Residential Premier 2 source water connections are swivel piping fittings that accept a 1"
male pipe thread (MPT) (see Figure 4A). The swivel connector has a rubber gasket seal similar
to a rubber hose gasket, which when mated to the flush end of any 1" 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 air coil inside the blower compartment.
To make the connection to a ground loop system, mate the brass connector (supplied in
CK4L and CK4S connector kits) 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 (see
Figure 4B). Tighten the connectors by
hand, then gently snug the fitting with pliers
to provide a leak-proof joint. When connect-
ing to an open loop (groundwater) system,
thread any 1" MPT fitting (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" inside diameter on the unit.
Limit hose length to 10 ft. per connec-
tion. Check carefully for water leaks.
WATER QUALITY
The unit may be ordered with either a copper or a cupronickel coaxial heat exchanger.
Copper is adequate for closed loop and open loop groundwater systems which are not high in
mineral content. In conditions anticipating moderate scale formation or in brackish water, a
cupronickel heat exchanger is recommended. In groundwater situations where scaling could be
heavy or where biological growth such as iron bacteria will be present, a closed loop system is
recommended. The heat exchanger coils in groundwater systems may over a period of time lose
heat exchange capabilities due to a buildup of mineral deposits inside. These can be cleaned,
but only by a qualified service mechanic as acid and special pumping equipment are required.
Desuperheater coils can likewise become scaled and possibly plugged. In areas with
extremely hard water, the owner should be informed that the heat exchanger may require
occasional acid flushing.
Figure 4B - The female
locking ring is threaded
onto the pipe threads which
holds the male pipe end
against the gasket and seals
the joint.
Figure 4A
AAA
AAA
AAAA
AAAA
Locking
Ring
Stainless
Steel
Snap Ring
Gasket
Support
Sleeve
Gasket
Material