Carrier WeatherMaster 50HC14 Installation Instructions Manual page 16

Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.76%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more
than 2%, contact your local electric utility company immedi-
ately.
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 200-v 1 / -in. male terminal on the primary side of the
4
transformer. Refer to unit label diagram for additional
information.
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 Carrier warranty.
NOTE: Check all factory and field electrical connections for
tightness.
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR — When installing units, provide
a disconnect switch of adequate size per NEC (National Elec-
trical Code). Disconnect sizing data is provided on the unit in-
formative 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.
UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR — The factory-installed option
non-fused disconnect switch (NFD) is located in a weather-
proof enclosure located under the main control box. The manu-
al switch handle is shipped in the disconnect or HACR enclo-
sure. Assemble the shaft and handle to the switch or HACR at
this point. Discard the factory test leads (see Fig. 23). The fac-
tory disconnect is a 200A disconnect on 230-3-60 units and a
100A disconnect on 460-3-60 and 575-3-60 units. On units
with factory installed non-fused disconnect, without factory in-
stalled electric heat, the factory supplied load side wires may
be of insufficient size for accessory electric heat applications. If
so, remove the load side factory wiring. Re-size wires per unit
nameplate data provided with accessory electric heat.
4
226
1 / -in. fe-
4
Fig. 25 — Location of Non-Fused Disconnect
To field install the NFD shaft and handle:
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 bottom.
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 point-
er to be 3.75 to 3.88 in. (95 to 99 mm) for 80A and 100A
NFD and 3.43 to 3.56 in. (87 to 90 mm) for 200A NFD.
7. Tighten the locking screw to secure the shaft to the NFD.
8. Turn the handle to the OFF position with red arrow point-
ing at 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.
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Enclosure