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SM Series Heat Pump
CONDENSATE DRAIN
A drain line must be connected to the heat pump and
pitched away from the unit a minimum of 1/8" per foot
to allow the condensate to flow away from the unit.
This connection must be in conformance with local
plumbing codes. A trap must be installed in the
condensate line to ensure free condensate flow.
A vertical air vent is sometimes required to avoid air
pockets. The length of the trap depends on the amount
of positive or negative pressure on the drain pan. A
second trap must not be included.(Figure # 45)
Figure # 45
DUCT SYSTEM
A supply air outlet collar and return air duct flange are
provided on all units to facilitate duct connections.
Supply air duct and return air duct flanges are
shipped unfolded with the unit.
Fold the duct flange outwards along the perforated line.
Refer to unit dimensional drawings for physical
dimensions of the collar and flange. (Pg#58 to Pg#61)
A flexible connector is recommended for supply and
return air duct connections on metal duct systems. All
metal ducting should be insulated with a minimum of
one inch duct insulation to avoid heat loss or gain and
prevent condensate forming during the cooling
operation. Application of the unit to uninsulated duct
work is not recommended as the unit's performance will
be adversely affected.
NOTICE: Do not connect discharge ducts
directly to the blower outlet.
The factory provided air filter must be removed when
using a filter back return air grill. The factory filter should
be left in place on a free return system.
If the unit will be installed in a new installation which
includes new duct work, the installation should be
designed using current ASHRAE procedures for duct
sizing. If the unit is to be connected to existing duct
work, a check should be made to assure that the duct
system has the capacity to handle the air required for
the unit application. If the duct system is too small,
larger duct work should be installed.
Check for existing leaks and repair.
Revised 07-17
The duct system and all diffusers should be sized to
handle the designed air flow quietly. To maximize sound
attenuation of the unit blower, the supply and return air
plenums should be insulated. There should be no direct
straight air path thru the return air inlet into the heat
pump. The return air inlet to the heat pump must have at
least one 90 degree turn away from the space return air
grille. If air noise or excessive air flow are a problem, the
blower speed can be changed to a lower speed to
reduce air flow.
PIPING
Supply and return piping must be as large as the unit
connections on the heat pump (larger on long runs).
NOTICE: Never use flexible hoses of a
smaller inside diameter than that of the
fluid connections on the unit.
SM units are supplied with either a copper or optional
cupro-nickel condenser. Copper is adequate for ground
water that is not high in mineral content.
Proper testing is recommended to assure the well
water quality is suitable for use with water source
equipment. When in doubt, use cupro-nickel.
In conditions anticipating moderate scale formation or in
brackish water, a cupro-nickel heat exchanger is
recommended.
Refer to the water quality table on pg #16.
Both the entering and leaving water lines will sweat if
subjected to low water temperature. These lines should
be insulated to prevent damage from condensation. All
manual flow valves used in the system must be ball
valves. Globe and gate valves must not be used due to
high pressure drop and poor throttling characteristics.
NOTICE: Never exceed the recommended
water flow rates as serious damage or
erosion of the water-to-refrigerant heat
exchanger could occur.
Always check carefully for water leaks and repair
appropriately. Units are equipped with swivel female
pipe thread fittings. Swivel fittings are used in typical
residential installation where water pressure ratings are
below 125 psi. For higher pressure ratings which are
typical to commercial installation, swivel fittings MUST
not be used. (VT, CF Swivel shipped loose, HZ factory
brazed). Consult unit dimensional drawings. (Pg#58
through Pg#61)
Pipe thread sealer should be used when connecting
water piping connections to the units to ensure
against leaks and possible heat exchanger fouling.
Condensate Drain | 15
8733942411 (2017/06)
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