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be in a conduit until they enter the duct panel; conduit termination

at the duct panel must be watertight. Run the high-voltage leads

through the power entry knockout on the power entry side panel

(See Fig. 2 and 3 for location and size). When the leads are inside

the unit, run leads up the high-voltage raceway to the line wiring

splice box (See Fig. 12 through 14). For single-phase units,

connect leads to the black and yellow wires; for 3-phase units,

connect the leads to the black, yellow, and blue wires (See Fig.

17).

CONNECTING GROUND LEAD TO GROUND LUG — Refer

to Fig. 17. Connect the ground lead to the chassis using the ground

lug in the wiring splice box.

ROUTING CONTROL POWER WIRES — (24 V) — Form a

drip-loop with the thermostat leads before routing them into the

unit. Route the thermostat leads through grommeted, low-voltage

hole provided in unit into unit control power splice box (See Fig.

2 and 3). Connect thermostat leads to unit control power leads as

shown in Fig. 16.

The unit transformer supplies 24-v power for complete system

including accessory electrical heater. An automatic-reset circuit

breaker (See Fig. 18) is provided in the 24-v circuit; see the caution

label on the transformer or Fig. 19. Transformer is factory wired

for 230-v operation. If supply voltage is 208 v, rewire transformer

primary as described in Special Procedures for 208-V Operation

section.

Fig. 15—Electrical Data Legend

C99024

452=5v

457=7v

455=2v

LEGEND

FLA — Full Load Amps

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

RLA — Rated Load Amps

NOTES:

1. In compliance with NEC (National Electrical Code) requirements

for multimotor and combination load equipment (refer to NEC

Articles 430 and 440), the overcurrent protective device for the

unit shall be Power Supply fuse. The CGA (Canadian Gas

Association) units may be fuse or circuit breaker.

2. Minimum wire size is based on 60 C copper wire. If other than

60 C wire is used, or if length exceeds wire length in table,

determine size from NEC.

3. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply volt-

age is greater than 2%.

Use the following formula to determine

the percentage of voltage imbalance.

% Voltage imbalance

max voltage deviation from average voltage

= 100 x

average voltage

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

452 + 464 + 455

Average Voltage =

1371

= 457

Determine maximum deviation from average voltage.

(AB) 457

(BC) 464

(AC) 457

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

457

= 1.53%

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

immediately.

Fig. 16—Control Connections

C99056

THERMOSTAT

AND SUBBASE

UNIT CONTROL POWER

SPLICE BOX

BRN

WHT

YEL

GRN

RED

ORN

Fig. 17—Line Power Connections

C99057

GROUND LUG

(IN SLPICE BOX)

BLU

YEL

BLK

GROUND

LEAD

SINGLE-PHASE

CONNECTIONS

TO DISCONNECT

PER NEC

3-PHASE

CONNECTIONS

LEGEND

NEC – National Electrical Code

Field Wiring

Splice Connections

NOTE: Use copper wire only.

Fig. 18—Control Wiring Plate

C99070

24 V Circuit Breaker

24 Volt Compartment

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 27 28

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