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4. Make sure the HACR circuit breaker shipped from the
factory is at OFF position (the white arrow pointing at
OFF).
5. Insert the shaft all the way with the cross pin on the top of
the shaft in the horizontal position.
6. Tighten the locking screw to secure the shaft to the
HACR circuit breaker.
7. Turn the handle to the OFF position with red arrow point-
ing at OFF.
8. Install the handle on to the painted cover horizontally
with the red arrow pointing to the left.
9. Secure the handle to the painted cover with (2) screws
and lock washers supplied.
10. Engaging the shaft into the handle socket, re-install (3)
hex screws on the HACR circuit breaker enclosure.
11. Re-install the unit front panel.
Fig. 29 — Handle and Shaft Assembly for HACR
Circuit Breaker
UNITS
WITHOUT
FACTORY-INSTALLED
FUSED
DISCONNECT
BREAKER — When installing units, provide a disconnect
switch per NEC (National Electrical Code) of adequate size.
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per na-
tional or local codes. Do not cover unit informative plate if
mounting the disconnect on the unit cabinet.
ALL UNITS — All field wiring must comply with NEC and
all local codes. Size wire based on MCA (Minimum Circuit
Amps) on the unit informative plate. See Fig. 24 and unit label
diagram for power wiring connections to the unit and equip-
ment ground. Maximum wire size is #4 ga AWG (copper only)
per pole on contactors and #2ga AWG (copper only) per pole
on optional non-fused disconnect or HACR.
Provide a ground-fault and short-circuit over-current protec-
tion device (fuse or breaker) per NEC Article 440 (or local
codes). Refer to unit informative data plate for MOCP (Maxi-
mum Over-current Protection) device size.
NOTE: Units ordered with factory-installed HACR do not
need an additional ground-fault and short-circuit over-current
protective device unless required by local codes.
NON-
OR
HACR
CIRCUIT
All field wiring must comply with the NEC and local re-
quirements.
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is to be
connected to a 208-v power supply, the control transformer
must be rewired by moving the black wire with the
male spade connector from the 230-v connection and moving it
to the 208-v
1
/
-in. male terminal on the primary side of the
4
transformer. Refer to unit label diagram for additional informa-
tion.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within 2%
and the current within 10%. Use the formula shown below to
determine the percent of voltage imbalance. Operation on im-
proper line voltage or excessive phase imbalance constitutes
abuse and may cause damage to electrical components. Such
operation would invalidate any applicable Carrier warranty.
Unbalanced 3-Phase Supply Voltage:
IMPORTANT: Never operate a motor where a phase
imbalance in supply voltage is greater than 2%. Use
the following formula to determine the percentage of
voltage imbalance.
% Voltage Imbalance = 100 x
Example: Supply voltage is 230-3-60.
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 227
224 = 3 v
–
(BC) 231
227 = 4 v
–
(AC) 227
226 = 1 v
–
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance =
This amount of phase imbalance is satisfactory as it is be-
low the maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance
is more than 2%, contact your local electric utility
company immediately.
NOTE: Check all factory and field electrical connections for
tightness.
19
1
/
-in. fe-
4
max voltage deviation from
average voltage
average voltage
224 + 231 + 226
3
681
=
3
= 227
4
100x
226
=
1.76%
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