Carrier Aquazone 50HQP 072, Installation, Start-Up And Service Instructions Manual

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17
EARTH COUPLED SYSTEMS
Operation of a unit on a closed loop application requires the ex
-
tended range option. See Fig. 15.
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 2 and 3 for electrical data.
See Fig. 2-5 for cabinet electrical wiring points. See Fig. 18-28 for
typical wiring diagrams. Unit will ship with wiring diagram af -
fixed to the inside of the unit control panel.
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
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. Re -
fer to the unit wiring diagram for details.
50HQP WITH SUPPLY FAN VFD
Units with the SAV
TM
or single speed VFD option include a VFD
that ships inside the unit control enclosure for field installation.
See Fig. 17 for field power wiring for VFD. Use the following
guidance for VFD installation:
NOTE: Installation must adhere to local codes and requirements.
1. Remove the VFD from the unit shipping storage location
(on the pallet or inside the unit, see Fig. 1).
2. Remove the VFD from the cardboard shipping box and
locate the ABB ACH550 VFD Installation, Operation, and
Maintenance Manual.
3. Follow the instructions for VFD installation in the ABB
ACH550 manual for VFD mounting.
4. Disconnect unit power and remove the electrical control
box and compressor access panel. See Fig. 16. Make field
wiring connections between VFD input terminals (U1, V1,
and W1) and Terminal Block 3 (TB3) located in the elec -
trical control box. See Fig. 17.
5. Make field wiring connections between VFD output termi -
nals (U2, V2, and W2) and Terminal Block 4 (TB4)
located in the electrical control box. See Fig. 17.
NOTE: All remote VFD field wiring must be installed per local
codes and requirements.
WARNING
To avoid possible injury or death due to electrical shock, open
the power supply disconnect switch and secure it in an open
position during installation.
CAUTION
All power connections must be properly torqued to avoid the
risk of overheating.
CAUTION
The power supply ground wire should never be used as a neu -
tral wire.