Trane GRCA - Start up

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
p owe r t o 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.
-15-
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.