10
Proper Piping Practice
NOTE: The unit gas supply entrance is factory
sealed with plugs. Keep plugs in place until
gas supply is ready to be installed. Once ready,
replace the plugs with the supplied grommets and
install gas supply line.
Gas Piping Checks
WARNING
To prevent property damage or personal injury due to fire,
the following instructions must be performed regarding
gas connections and pressure testing:
•
The unit and its gas connections must be leak tested
before fire, never use a match or open flame to test
for leaks. Never exceed specified pressures for
testing. Higher pressure may damage gas valve and
cause overfiring which may result in premature heat
exchanger failure.
•
This unit and its shut-off valve must be disconnected
from the gas supply during any pressure testing of that
system at pressures in excess of 1/2 PSIG (3.48 kPA).
•
This unit must be isolated from the gas supply system by
closing its manual shut-off valve during any pressure
testing of the gas supply piping system at test pressures
equal to or less than 1/2 PSIG (3.48 kPA).
WARNING
To avoid property damage or personal injury, be sure there is
no open flame in the vicinity during air bleeding.
There will be air in the gas supply line after testing for leaks
on a new installation. Therefore, the air must be bled from
the line by loosening the ground joint union until pure gas
is expelled. Tighten union and wait for five minutes until all
gas has been dissipated in the air. Be certain there is no
open flame in the vicinity during air bleeding procedure.
The unit is placed in operation by closing the main electrical
disconnect switch for the unit.
ELECTRICAL WIRING
Thermostat Location
Mount the thermostat approximately five feet above the
floor, in an area that has an inside, vibration-free wall and
has good air circulation.
Movement of air must not be obstructed by furniture, door,
draperies, etc. The thermostat must not be mounted where
it will be affected by drafts, hot or cold water pipes or air
ducts in walls, radiant heat from fireplace, lamps, the sun,
television, etc. Consult the Instruction Sheet packaged with
thermostat for mounting instructions.
NOTE: All units have one stage of heating and
either one or two stages of mechanical cooling.
If the unit has two stages of mechanical cooling,
the thermostat must also be two stage. Refer to
figures later in this section for wiring.
WARNING
To avoid personal injury, electrical shock or death,
disconnect electrical power before servicing or changing
any electrical wiring.
The units are designed for operation on 60 hertz current
and at voltages as shown on the rating plate. All internal
wiring in the unit is complete. It is necessary to bring in the
power supply to the contactor as shown on the unit wiring
diagram which is supplied with each unit. The low voltage
wiring must be connected between the unit control panel
and the room thermostat.
R
C
G
W
Y
THERMOSTAT
RD
BL
GR WH YL YL
1 STAGE COOLING - 1 PHASE POWER
R
C
G
RD
BL
GR WH
W1 W2
Y1
Y2
YL YL
PU
PU
THERMOSTAT
2 STAGE COOLING - 1 PHASE POWER
WIRING LEGEND
FACTORY WIRING
FIELD WIRING
WIRE NUT CONNECTION
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. Ensure low
voltage connections are waterproof.
WARNING
To avoid the risk of electrical shock, wiring to the unit must
be polarized and grounded.
