FIELD POWER SUPPLY— 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 sup-
ply, the transformer must be rewired by moving the black
wire from the 230-v orange wire on the transformer and con-
necting it to the 200-v red wire from the transformer. The
end of the orange wire must then be insulated.
Refer to unit label diagram for additional information. Wir-
ing leads are provided for field service. Use copper conduc-
tors only when splice connectors are used.
When installing units, provide a disconnect per NEC.
All field wiring must comply with NEC and local require-
ments. In Canada, electrical connections must be in accor-
dance with CSA (Canadian Standards Association) C22.1
Canadian Electrical Code Part 1.
Install field wiring as follows:
1. Connect ground lead to chassis ground connection when
using separate ground ties.
2. Install conduit between disconnect and side panel. Insert
conduit through power supply knockout opening. See
Fig. 9.
3. Connect power lines to power wiring leads.
4. Pigtails are provided for field power connections and are
located inside the burner access panel. See Fig. 10 and
11. Use factory-supplied splices or Underwriters’ Labo-
ratories (UL) approved copper connector.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate (see
Table 2). On 3-phase units, voltages between phases must be
balanced within 2% and the current within 10%. Use the for-
mula shown in the legend for Table 2, Note 2 to determine
the percent of voltage imbalance. 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.
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to installation in-
structions included with the accessory. Locate thermostat as-
sembly on a solid wall in the conditioned space to sense av-
erage temperature in accordance with thermostat installation
instructions. Connect thermostat wires to terminal board.
Route thermostat cable or equivalent single leads of col-
ored wire from subbase terminals through connector on unit
to low-voltage connections (shown in Fig. 12).
NOTE: For wire runs up 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C minimum). All
wire larger than no. 18 AWG cannot be directly connected
to the thermostat and will require a junction box and splice
at the thermostat.
Feed control wires through the raceway located between
the condenser coil top cover and burner side panel. See
Fig. 10. Connect control wires to corresponding screw ter-
minals, the low-voltage connections located inside low-
voltage access panel. See Fig. 12 for connections. The low-
voltage connections provide the ULrequired clearance between
high- and low-voltage wiring.
HEAT ANTICIPATOR SETTINGS — Set heat anticipator
settings at .14 amp for the first stage and .14 amp for second-
stage heating, when available.
MAXIMUM ALLOWABLE DIFFERENCE
(in.)
A-B B-C A-C
0.5 1.0 1.0
Fig. 3 — Unit Leveling Tolerances
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