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4 -
Make wiring connections as follows:
•
Heaters equipped with circuit breakers –
Connect
field power supply wiring to circuit breaker(s).
•
Heaters equipped with terminal blocks –
Con-
nect field power supply wiring to terminal block(s).
•
Heaters equipped with fuses (460V, 3-Phase,
60Hz and 575V, 3-Phase, 60Hz) –
Connect field
power supply wiring to fuse block. (An extension
plate is provided for J-voltage units.)
Unit Start-Up
1 - Replace the air handler access cover.
2 - Restore power to the unit.
3 - Set the thermostat heat anticipator to 0.4 amps.
4 - Align the provided wiring diagram sticker with the
air handler diagram on the blower housing. Remove
the backing and affix the sticker to the housing.
5 - Set the thermostat above room temperature.
6 - Check the system for normal operation.
7 - Set the thermostat to desired setting.
FIGURE 10. Installing Fuse Block and Transformer (575V only)
Air Handler Blower Speed Connections
When using ECB27 heat section, adjust the blower speed
according to the size of electric heat and air handler unit.
The
minimum blower setting
for each air handler size
with any heat sections in any application is
HIGH
. See
specific air handler installation instructions for blower
speed adjustment procedure.
Typical Unit Applications
Refer to figures 11 and 12 for typical field wiring for cooling
and heat pump applications including an air handler with
electric heat.
CIRCUIT 1
CIRCUIT
BREAKERS OR
TERMINAL
BLOCK
1
4
7
3
6
9
CB1
CIRCUIT
BREAKER
NOTE - USE COPPER CONDUCTORS ONLY
REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM
OVERCURRENT PROTECTION SIZE
NOTE - ALL REMAINING WIRES FACTORY
‐
INSTALLED
LINE VOLTAGE FIELD
‐
INSTALLED
CLASS 2 VOLTAGE FIELD
‐
INSTALLED NEC/CEC
TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM
THERMOSTAT HEAT ANTICIPATION SETTING 0.4 AMP (ELECTRIC HEAT)
WHEN TWO
‐
STAGE THERMOSTAT IS USED, CONNECT SECOND STAGE
NALS “R” AND “W2”
FACTORY
‐
INSTALLED JUMPER
L3 CONNECTION USED ON (Y VOLTAGE) 3
‐
PHASE ELECTRIC HEATERS
ONLY
FIGURE 11. Typical Field Wiring – Cooling Application with Electric Heat
