16
6. The pigtail wires in the electric heat access area are factory wired to the contactor in
the control box.
7. DO NOT connect aluminum field wires to electric heat kit power input terminals.
B. SPECIAL INSTRUCTIONS FOR POWER WIRING WITH ALUMINUM
CONDUCTORS.
1. Select the equivalent aluminum wire size from the tabulation below:
2. Attach a length (6" or more) of recommended size copper wire to the unit terminals
L1 and L3 for single phase, L1, L2, L3 for three phase.
3. Splice copper wire pigtails to aluminum wire with U.L. recognized connectors for
copper-aluminum splices. Follow these instructions very carefully to make a positive
and lasting connection;
a. Strip insulation from aluminum conductor.
b. Coat the stripped end of the aluminum wire with the recommended inhibitor and
wire brush aluminum surface through inhibitor. Inhibitors: Brundy, Pentex “A”;
Alcoa, No. 2EJC; T&B KPOR Shield.
ILL I312
F
IGURE 17
HEATER KIT INSTALLATION
R
W2
X
B
Y1
Y2
G
E
RED
BLACK
BROWN
BLUE
YELLOW
ORANGE
GRAY
NOTES: IF EMERGENCY HEAT RELAY AND OUTDOOR THERMOSTATS ARE NOT USED, A JUMPER BETWEEN “W2” AND “E” CAN BE INSTALLED TO TRANSFER
CONTROL OF HEATING TO THE FIRST STAGE WHEN THE SYSTEM SWITCH IS IN THE EMERGENCY HEAT POSITION.
Y2 IS ONLY USED WITH OPTIONAL ECONOMIZER.
THERMOSTAT
SUB-BASE
UNIT CONTROL
WIRE PIGTAILS
STANDARD
R
G
B
X
E
W2
Y1
Y2
RED
GRAY
BLUE
BROWN BROWN
RED
WHITE
BLACK BLACK
YELLOW
ORANGE
THERMOSTAT
SUB-BASE
UNIT CONTROL
WIRE PIGTAILS
OUTDOOR
THERMOSTAT
W/EMERGENCY
HEAT RELAY
WITH ONE OUTDOOR THERMOSTAT
W/EMERGENCY HEAT RELAY
FIGURE 18
V
OLTAGE CONNECTIONS DIAGRAMS
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