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Piping
LM Series Heat Pump
LM Series Heat Pump
8 733 905 315 (2013/9)
Subject to change without prior notice
PIPING
Supply and return piping must be as large as the
unit connections on the heat pump (larger on long
runs).
LM 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.
In conditions anticipating moderate scale
formation or in brackish water a cupro-nickel 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 must be ball valves. Globe and gate
valves must not be used due to high pressure drop
and poor throttling characteristics.
Always check carefully for water leaks and repair
appropriately. Units are equipped with female pipe
thread fittings. Consult Unit Dimensional
Drawings. (Pg#55 through Pg#58)
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.
ELECTRICAL
Refer to electrical component box layout.
(Figures #6-8)
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 diagram (Figures#25 through #31,
Pg#38 through Pg#47).
Never use flexible hoses of a smaller inside
diameter than that of the fluid connections
on the unit.
Proper testing is recommended to assure the
well water quality is suitable for use with water
source equipment.
Never exceed the recommended water flow
rates, as serious damage or erosion of the
water-to-refrigerant heat exchanger could
occur.
Teflon tape sealer should be used when
connecting water piping connections to the units
to insure against leaks and possible heat
exchanger fouling.
Do not overtighten the connections.
Field wiring must comply with local and
national electric 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.
Units supplied with internal electric heat require
two (2) separate power supplies:
1) Unit compressor
2) Electric Heat, Blower Motor and Control
Circuit.
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Refer to the ELECTRIC HEATER PACKAGE
OPTION section and Pg#38 through Pg#47 for
wiring diagrams. See data plate for minimum
circuit ampacities and maximum fuse/breaker
sizing.
Summary of Contents for LM Series
Page 39: ...Wiring Diagrams 39 LM Series Heat Pump 8 733 905 315 2013 9 Revised 09 13 Figure 26 ...
Page 41: ...Wiring Diagrams 41 LM Series Heat Pump 8 733 905 315 2013 9 Revised 09 13 Figure 28 ...
Page 43: ...Wiring Diagrams 43 LM Series Heat Pump 8 733 905 315 2013 9 Revised 09 13 Figure 30 ...
Page 45: ...Wiring Diagrams 45 LM Series Heat Pump 8 733 905 315 2013 9 Revised 09 13 ...
Page 47: ...Wiring Diagrams 47 LM Series Heat Pump 8 733 905 315 2013 9 Revised 09 13 Figure 31 ...
Page 49: ...Wiring Diagrams 49 LM Series Heat Pump 8 733 905 315 2013 9 Revised 09 13 Figure 33 ...
Page 59: ...Notes 59 LM Series Heat Pump 8 733 905 315 2013 9 Revised 09 13 NOTES ...
