Carrier 48GC 04-06 Series Service And Maintenance Instructions page 62

3. Set system switch selector at HEAT position and fan
switch at AUTO. or ON position. Set heating temperature
lever above room temperature.
4. The induced-draft motor will start.
5. After a call for heating, the main burners should light
within 5 seconds. If the burner does not light, then there is
a 22-second delay before another 5-second try. If the
burner still does not light, the time delay is repeated. If the
burner does not light within 15 minutes, there is a lockout.
To reset the control, break the 24 v power to W1.
6. The evaporator-fan motor will turn on 45 seconds after
burner ignition.
7. The evaporator-fan motor will turn off in 45 seconds after
the thermostat temperature is satisfied.
8. Adjust airflow to obtain a temperature rise within the
range specified on the unit nameplate.
NOTE: The default value for the evaporator-fan motor on/off de-
lay is 45 seconds. The Integrated Gas Unit Controller (IGC) modi-
fies this value when abnormal limit switch cycles occur. Based
upon unit operating conditions, the on delay can be reduced to
zero seconds and the off delay can be extended to 180 seconds.
When one flash of the LED is observed, the evaporator-fan on/off
delay has been modified.
If the limit switch trips at the start of the heating cycle during the
evaporator on delay, the time period of the on delay for the next
cycle will be 5 seconds less than the time at which the switch
tripped. (Example: If the limit switch trips at 30 seconds, the evap-
orator-fan on delay for the next cycle will occur at 25 seconds.) To
prevent short-cycling, a 5-second reduction will only occur if a
minimum of 10 minutes has elapsed since the last call for heating.
The evaporator-fan off delay can also be modified. Once the call
for heating has ended, there is a 10-minute period during which
the modification can occur. If the limit switch trips during this pe-
riod, the evaporator-fan off delay will increase by 15 seconds. A
maximum of 9 trips can occur, extending the evaporator-fan off
delay to 180 seconds.
To restore the original default value, reset the power to the unit.
To shut off unit, set system selector switch at OFF position.
Resetting heating selector lever below room temperature will
temporarily shut unit off until space temperature falls below
thermostat setting.
Ventilation (Continuous Fan)
Set fan and system selector switches at ON and OFF positions, re-
spectively. Evaporator fan operates continuously to provide con-
stant air circulation. When the evaporator-fan selector switch is
turned to the OFF position, there is a 30-second delay before the
fan turns off.
FASTENER TORQUE VALUES
Heat shield screws
Stator motor mounting
screws
Fan rotor mounting screws
Limit switch screws
Fan Deck bracket screws
Condenser fan motor
mounting screws
Condenser fan hub set
screw
Compressor mounting bolts 65 in.-lb (7.3 Nm) +10 in.-lb (1.2 Nm)
START-UP, RTU OPEN CONTROLS
IMPORTANT: SET-UP INSTRUCTIONS
Installation, wiring and troubleshooting information for the
RTU Open Controller.: "48/50FC, 48/50GC Single Package
Rooftop Units with RTU Open Controls, Start-up, Operation
and Troubleshooting Instructions." Have a copy of this manual
available at unit start-up.
START-UP, SYSTEMVU CONTROLS
IMPORTANT: SET-UP INSTRUCTIONS
Installation, wiring and troubleshooting information for the
SystemVu™ Controller.: "48/50FC 04-07, 48/50GC 04-06
Single Package Rooftop Units with SystemVu Controls
Version X.X Controls,
Troubleshooting." Have a copy of this manual available at
unit start-up.
62
30 in.-lb (3.4 Nm) ±2 in.-lb (0.2 Nm)
23 in.-lb (2.6 Nm) ±2 in.-lb (0.2 Nm)
23 in.-lb (2.6 Nm) ±2 in.-lb (0.2 Nm)
50 in.-lb (5.7 Nm) ±5 in.-lb (0.6 Nm)
50 in.-lb (5.7 Nm) ±5 in.-lb (0.6 Nm)
30 in.-lb (3.4 Nm) ±3 in.-lb (0.3 Nm)
60 in.-lb (6.8 Nm) ±5 in.-lb (0.6 Nm)
Start-up, Operation and