York AFFINITY YAFT026 Installation Manual page 8

AFFINITY & AFFINITY ADVANCED SINGLE & DUAL CAPACITY SERIES INSTALLATION MANUAL
General Installation Information cont.
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 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. 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 Locking
Steel Ring
Snap Ring
Gasket
Support
Gasket
Sleeve
Material
Water Quality
It is the responsibility of the system designer and installing
contractor to ensure that acceptable water quality is present and
that all applicable codes have been met in these installations.
Failure to adhere to the guidelines in the water quality table could
result in loss of warranty. In ground water 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 ground water 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 special solutions and pumping equipment
are required. Hot water generator 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 flushing.
Heat pumps with cupronickel heat exchangers are recommended
for open loop applications due to the increased resistance to
build-up and corrosion, along with reduced wear caused by acid
cleaning.
Water Treatment
Do not use untreated or improperly treated water. Equipment
damage may occur. The use of improperly treated or untreated
water in this equipment may result in scaling, erosion, corrosion,
algae or slime. Purchase of a pre-mix antifreeze could significantly
improve system reliability if the water quality is controlled and there
are additives in the mixture to inhibit corrosion. There are many
examples of such fluids on the market today such as Environol™
1000 (pre-mix ethanol), and others. The services of a qualified
water treatment specialist should be engaged to determine what
treatment, if any, is required. The product warranty specifically
excludes liability for corrosion, erosion or deterioration of
equipment.
8