577C--C, 577C--E, 577C--F: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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use vapor barrier in accordance with latest issue of Sheet Metal and
Air Conditioning Contractors National Association (SMACNA)
and Air Conditioning Contractors of America (ACCA) minimum
installation standards for heating and air conditioning systems.
Secure all ducts to building structure.
7. Flash, weatherproof, and vibration isolate all openings in building
structure in accordance with local codes and good building
practices.
Step 10 – Install Electrical Connections
High-Voltage Connections
When routing power leads into unit, use only copper wire between
disconnect and unit. The high voltage leads should be in a conduit until
they enter the duct panel; conduit termination at the duct panel must be
watertight.
The unit must have a separate electrical service with a field-supplied,
waterproof disconnect switch mounted at, or within sight from, the unit.
Refer to the unit rating plate, NEC and local codes for maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) for wire
sizing.
The field-supplied disconnect switch box may be mounted on the unit
over the high-voltage inlet hole when the standard power and
low-voltage entry points are used (See
for acceptable
location).
NOTE:
Field supplied disconnect switch box should be positioned so
that it does not cover up any of the unit gas combustion supply air
louvers.
See unit wiring label (
-
) and
for reference when
making high voltage connections. Proceed as follows to complete the
high-voltage connections to the unit.
Single phase units:
1. Run the high-voltage (L1, L2) and ground lead into the control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side of the
contactor (if equipped).
4. Connect field L1 to black wire on connection 11 of the compressor
contactor.
5. Connect field wire L2 to yellow wire on connection 23 of the
compressor contactor.
Three-phase units:
1. Run the high-voltage (L1, L2, L3) and ground lead into the control
box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side of the
contactor (if equipped).
4. Connect field L1 to black wire on connection 11 of the compressor
contactor.
5. Connect field wire L3 to yellow wire on connection 13 of the
compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
Special Procedures for 208-v Operation
Control Voltage Connections
Do not use any type of power-stealing thermostat. Unit control problems
may result.
Use no. 18 American Wire Gage (AWG) color-coded, insulated (35°C
minimum) wires to make the control voltage connections between the
thermostat and the unit. If the thermostat is located more than 100 ft
(30.5 m) from the unit (as measured along the control voltage wires), use
no. 16 AWG color-coded, insulated (35°C minimum) wires.
Standard Connection
Run the low-voltage leads from the thermostat, through the inlet hole,
and into unit low-voltage splice box.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
The unit cabinet must have an uninterrupted, unbroken electrical
ground. This ground may consist of an electrical wire connected to the
unit ground screw in the control compartment, or conduit approved for
electrical ground when installed in accordance with NFPA 70 (NEC)
(latest edition) (in Canada, Canadian Electrical Code CSA C22.1) and
local electrical codes.
CAUTION
!
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit being
installed.
1. Make all electrical connections in accordance with NFPA 70
(NEC) (latest edition) and local electrical codes governing such
wiring. In Canada, all electrical connections must be in
accordance with CSA standard C22.1 Canadian Electrical Code
Part 1 and applicable local codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO NOT
USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating
voltage range indicated on unit rating plate. On 3-phase units,
ensure phases are balanced within 2 percent. Consult local
power company for correction of improper voltage and/or phase
imbalance.
4. Insulate low-voltage wires for highest voltage contained within
conduit when low-voltage control wires are in same conduit as
high-voltage wires.
5. Do not damage internal components when drilling through any
panel to mount electrical hardware, conduit, etc.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Make sure the power supply to the unit is switched OFF and install
lockout tag before making any wiring changes. With disconnect switch
open, move black wire from transformer (3/16 in. [4.8mm]) terminal
marked 230 to terminal marked 208. This retaps transformer to primary
voltage of 208 vac.
WARNING
!
ELECTRICAL SHOCK FIRE/EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death
and property damage.
Before making any wiring changes, make sure the gas supply is switch
off first.
Then
switch off the power supply to the unit and install lockout
tag.
