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EARTH COUPLED SYSTEMS
Operation of a unit on a closed loop application requires the ex-
tended range option.
NOTE: Closed loop and pond applications require specialized de-
sign knowledge. No attempt at these installations should be made
unless the dealer has received specialized training.
Utilizing Ground Loop Pumping Package (GLP) makes the instal-
lation easy. Anti-freeze solutions must be utilized when low evap-
orating conditions are expected to occur. Refer to the installation
manuals for more specific instructions.
Step 8 — Wire Field Power Supply
See Tables 3-6 for electrical data.
See Fig. 2-5 for cabinet electrical wiring points. See typical wir-
ing diagrams starting on page 21. Unit will ship with wiring dia-
gram affixed to the inside of the unit control panel.
HIGH VOLTAGE
All field-installed wiring must comply with the National Electric
Code as well as all applicable local codes. Refer to the unit electri-
cal data on the unit nameplate for wire and branch circuit protec-
tion sizing. Supply power voltage and phasing should match the
Fig. 17 — Cooling Tower/Boiler Application
18
required voltage and phasing shown on the unit nameplate. Oper-
ating the unit below the minimum voltage, above the maximum
voltage or with incorrect phasing can result in poor system perfor-
mance or damage to the heat pump. All field wiring should be in-
stalled by qualified and trained personnel. Refer to the unit wiring
diagram for field connection requirements.
Power wiring to the heat pump should be enclosed in flexible
conduit to minimize the transmission of vibration from the unit
cabinet to the building.
For heat pumps with unit mounted disconnect switches, field pow-
er should be connected to the marked terminals on the disconnect
switch. For heat pumps without unit-mounted disconnect switches
(except units with dual power supply), power is connected to the
line (L) side of the compressor contactor and the ground lug in the
unit electrical box.
CONTROL TRANSFORMER SETTING FOR 208V UNITS
As factory built, all 208/230-v units are wired for 230-v operation.
For job sites with a 208-v power supply, the primary leads on the
unit transformer will need to be changed from 230-v to 208-v.
Refer to the unit wiring diagram for details.
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