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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 following for-
mula to determine the percent of voltage imbalance.
max voltage deviation from average voltage
% Voltage
= 100 x
Imbalance
Example: Supply voltage is 230-3-60
AB = 224 v
A
B
C
BC = 231 v
AC = 226 v
MOTOR
(224 + 231 + 226)
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 = 100x
This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate
any applicable ICP warranty.
UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT
The factory-installed optional non-fused disconnect (NFD)
switch is located in a weatherproof enclosure located under
the main control box. The manual switch handle and shaft
are shipped in the disconnect enclosure. Assemble the
shaft and handle to the switch at this point. Discard the fac-
tory test leads (see Fig. 24).
Connect field power supply conductors to LINE side termi-
nals when the switch enclosure cover is removed to attach
the handle.
To field install the NFD shaft and handle (see Fig. 25):
1. Remove the unit front panel (see Fig. 2).
2. Remove (3) hex screws on the NFD enclosure - (2)
on the face of the cover and (1) on the left side cover.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at
OFF position (the arrow on the black handle knob is
at OFF).
5. Insert the shaft with the cross pin on the top of the
shaft in the horizontal position.
6. Measure the tip of the shaft to the top surface of the
pointer to be 3.75 in. to 3.88 in. (95 mm to 99 mm) for
80A and 100A NFD and 3.43 in. to 3.56 in. (87 mm to
90 mm) for 200A NFD.
7. Tighten the locking screw to secure the shaft to the
NFD.
14
average voltage
681
=
=
227
3
3
4
= 1.78%
227
Specifications subject to change without notice.
8. Turn the handle to the OFF position with red arrow
pointing to OFF.
9. Install the handle on to the painted cover horizontally
with the red arrow pointing to the left.
10. Secure the handle to the painted cover with (2)
screws and lock washers supplied.
11. Engaging the shaft into the handle socket, re-install
(3) hex screws on the NFD enclosure.
12. Re-install the unit front panel.
Fig. 24 — Location of Non-Fused Disconnect Enclosure
Fig. 25 — Handle and Shaft Assembly for NFD
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED
DISCONNECT
When installing units, provide a disconnect switch per NEC
(National Electrical Code) of adequate size. Disconnect siz-
ing data is provided on the unit informative plate. Locate on
unit cabinet or within sight of the unit per national or local
codes. Do not cover unit informative plate if mounting the
disconnect on the unit cabinet.
RAV-180-01SI
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