Piping; Electrical - Sears GT Series Installation Instructions Manual

There s hould benodirect straight airpath
through the return air
grille 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 nmst be as large as the unit connections
on the heat pump (larger on long runs).
[]NIT OPERATION HAZARD
Failure to follow this caution may result in improper
equipment operation.
Never use flexible hoses of a smaller inside diameter than
that of the fluid connections on the unit.
GT units are supplied with either a copper or optional cupronickel
condenser. Copper is adequate for ground water that is not high in
mineral content.
NOTE: Proper testing is recommended to assure the well water
quality is suitable for use with water source equipment. When in
doubt, use cupronickel. See Application Considerations notes on
page 4.
In conditions anticipating moderate scale formation or in brackish
water, a cupronickel heat exchanger is recommended.
Both the supply and discharge 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 nmst be ball valves. Globe and gate valves must not be
used due to high pressure drop and poor throttling characteristics.
EQUIPMENT DAMAGE
OPERATION HAZARD
AND/OR UNIT
Failure to follow this caution may result in equipment
damage and/or improper operation.
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.
[]nits are equipped with female pipe thread fittings. Consult []nit
Dimensional Drawings.
NOTE: Teflon tape sealer should be used when connecting water
piping connections to the units to insure against leaks and possible
heat exchanger fouling.
IMPORTANT: Do not over-tighten connections.
Flexible hoses should be used between the unit and the rigid
system to avoid possible vibration. Ball valves should be installed
in the supply and return lines for unit isolation and unit water flow
balancing (on open-loop systems).
ELECTRICAL
Refer to electrical component box layout. See Fig. 66.
[]NIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage and/or improper operation.
• Field wiring must comply with local and national
electrical codes.
• Power to the unit must be within the operating voltage
range indicated on the unit nameplate or on the
performance data sheet.
• Operation of unit on improper line voltage or with
excessive phase imbalance will be hazardous to the unit,
constitutes abuse, and may void the warranty.
Properly sized fuses or HACR circuit breakers must be installed for
branch circuit protection. See unit nameplate for maximum fuse or
breaker size.
The unit is provided with a concentric knock-out for attaching
common trade sizes of conduit, route power supply wiring through
this opening.
Always connect the ground lead to the grounding lug provided in
the control box and power leads to the line side of compressor
contactor as indicated on the wiring diagrams.
IMPORTANT: []nits supplied with internal electric heat
require two (2) separate power supplies:
1) []nit compressor
2) Electric Heat, blower motor and control circuit.
Refer to the ELECTRIC HEATER PACKAGE OPTION section.
See data plate for minimum circuit ampacities and maximum
fuse/breaker sizing.
+--<5_
A14119
(I) Compressor Contactor (5) Auxiliary Pump Relay (Option)
(2) Comfort Alert Module (6) Transformer
(3) Second Stage Relay (7) Capacitor
(4)
Unit Protection Module
(UPM) (8)
ECM Module
- mounts on E-box cover
Fig. 66 - Electrical Component Box Layout
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