Start Up - Trane GRAA Installation Operation & Maintenance

inlet airstream at the end of the heat exchanger.
When the temperature reaches the limit setpoint,
normally caused by insufficient air throughput, all
gas is shutoff. The limit control has an automatic
reset and once the unit has cooled, it will reset itself .
This is a safety control and if cycling on the primary
limit is noted, corrective action must be taken. See
unit wiring diagram for electrical location. This control
must never be bypassed. Upon completion of unit
installation, the primary limit must be checked for
proper operation. This can be accomplished by \
removing power to the indoor air blower and a call for
heat.
Draftor End Switch : This switch is located at the
end of the draftor motor and is integral to the motor.
The switch, whic h is normally open, will close when
draftor motor attains the minimum speed for proper
combustion allowing main burner operation. The pilot
burner will light without a proven draftor end switch.
See unit wiring diagram for electrical location.
Clogged Filter Switch: (Optional) The clogged filter
switch monitors the pressure differential across the
air filters. If this pressure differential becomes too
great, the switch will alert of this condition. At this
point the air filters must either be cleaned or
replaced. The switch will reset itself.
Firestat: (Optional) Located in either the return
airstream, the supply airstream, or both, this control
monitors temperatures with setpoints which are field
adjustable. If the temperature exceeds the setpoint,
the control will cease unit operation. To resume unit
operation, a manual reset of this control is required.
Freezestat: (Optional) Located in either the return
airstream, the supply airstream, or both, this control
monitors temperatures with setpoints which are field
adjustable. If the temperature does not exceed the
setpoint, the control will cease unit operation.
V. START UP
Before starting the unit, use the "Installation Check
Sheet" (located at the end of this manual) and read
the Outdoor Duct Furnace Manual entirely in con-
junction with the procedures outlined below to
ensure that the unit is completely and properly
installed and ready for start up.
1. Inspect all wiring connections; connections
should be clean and tight. Trace circuits to
insure that actual wiring agrees with the "as
wired" diagrams provided with the unit.
Information in the wiring diagram title block
should match the data appearing on the unit
nameplate.
2. Lubricate all electrical motors according to the
manufacturer' s recommendations .
3. Verify that the system switch is in the OFF position.
4. Check unit supply voltage to ensure that it is
within the utilization range.
5. Inspect the interior of the unit; remove any
debris or tools which may be present.
Starting Unit in Heating Mode
1 . Close the un i t disconnect switch which provides
powe r to th e u nit .
3. Place the system switch in the ON position.
With the thermostat calling for heat, unit operation is
automatic.
Starting Unit in Cooling Mode
1. Close the unit disconnect switch which provides
power to the unit.
3. Place the system switch in the ON position.
With the thermostat calling for cooling, unit operation
is automatic.
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2. Set the thermostat/switching subbase as indicat-
ed below:
a. position the heating system switch at either
HEAT ' or AUTO;
b: set the fan switch to AUTO.
2. Set the thermostat/switching subbase as indicat-
ed below:
a. position the cooling system switch at either
COOL or AUTO;
b. set the fan switch to AUTO.