Operating instructions

8
G
Y
W
R
R
W
Y
G
From
Unit
Proper Thermostat Wiring
Refer to the unit wiring diagram for electrical connections. When
installed, the unit must be electrically grounded in accordance
with local codes or in the absence of local codes, with the
National Electrical Code, ANSI/NFPA No. 70, and/or the CSA
C22.1 Electrical Code, if an external source is utilized.
WARNING
T
O AVOID THE RISK OF ELECTRICAL SHOCK, WIRING TO THE UNIT MUST BE
POLARIZED AND GROUNDED.
CAUTION
T
O AVOID PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE, USE
ONLY COPPER CONDUCTORS.
CAUTION
T
O PREVENT IMPROPER AND DANGEROUS OPERATION DUE TO WIRING ERRORS,
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS.
V
ERIFY PROPER OPERATION AFTER SERVICING.
The best protection for the wiring is the lowest rated fuse or
circuit breaker which will supply power to the unit during normal
operation without nuisance trips. Such a device will provide
maximum circuit protection. DO NOT EXCEED THE MAXIMUM
OVERCURRENT DEVICE SIZE SHOWN ON UNIT DATA
PLATE.
All line voltage connections must be made through weatherproof
fittings. All exterior power supply and ground wiring must be in
approved weatherproof conduit. Low voltage wiring from the
unit control panel to the thermostat requires coded cable. For
ground level and rooftop wiring see figures below.
UNIT VOLTAGE
The unit transformer is factory connected for 230V operation. If
the unit is to operate on 208V, reconnect the transformer primary
lead and induced draft blower motor leads as shown on the unit
wiring diagram.
AIR CIRCULATION AND FILTERS
AIRFLOW CONVERSION
This package gas unit is shipped from the factory with the
appropriate blower setting for a normal horizontal discharge
installation. Units can easily be converted from horizontal to
vertical airflow delivery. In down-discharge or high static
installations, the installer should measure the total external static
Electrical Power Directly To Junction Box
Electrical Power Routed Through Bottom of Unit
and review the blower performance charts in the Product Data
Book applicable to your model*. In some installations it will be
necessary to change the blower speed to provide proper air
flow.
If converting to down discharge airflow, be sure to refer to the
unit rating plate for approved duct orientation and proceed as
follows:
• Cut insulation around bottom openings and remove panels
from the bottom of the unit, saving the screws holding the
panels in place.
• Install horizontal duct cover kit.
DUCTWORK
Duct systems and register sizes must be properly designed for
the C.F.M. and external static pressure rating of the unit.
Ductwork should be designed in accordance with the
recommended methods of Air Conditioning Contractors of