Process - Carrier 48AJ Operating And Service Manual

6. Install the fan in reverse order, noting the following: the
fan airflow is up (refer to arrow on fan); the fan wire
harness is toward the front; the notched housing barb is
located in the right-rear corner; and the fan cable connects
just forward of the fan at the top of the drive.
To replace the internal enclosure fan for frame sizes R5 or
R6, perform the following:
1. Remove power from drive.
2. Remove the front cover.
3. Lift the fan out and disconnect the cable.
4. Install the fan in reverse order.
5. Restore power.
CONTROL PANEL CLEANING — Use a soft damp cloth
to clean the control panel. Avoid harsh cleaners which could
scratch the display window.
BATTERY REPLACEMENT — A battery is only used in as-
sistant control panels that have the clock function available and
enabled. The battery keeps the clock operating in memory
during power interruptions. The expected life for the battery is
greater than ten years. To remove the battery, use a coin to
rotate the battery holder on the back of the control panel.
Replace the battery with type CR2032.
If the System Mode is OFF:
{
If the fire shut down input (Inputs
is in "alarm":
HVAC mode:
Else
HVAC mode:
}
Else If: The rooftop is not in "factory test" and a fire
smoke-control mode is "alarming":
{
If the pressurization input (Inputs
is in "alarm":
HVAC mode:
Else If the evacuation input (Inputs
is in "alarm":
HVAC mode:
Else If the smoke purge input (Inputs
is in "alarm":
HVAC mode:
}
Else If: Someone changed the machine's
control type (Configuration
run time, a 15 second delay is called out:
{
HVAC mode:
}
Else If: The System Mode is TEST:
{
APPENDIX D — Mode Selection Process
→ →
FIRE FSD)
("Fire Shut Down ") OFF
("Disabled ") OFF
→ →
FIRE PRES)
("Pressurization ")
→ →
FIRE EVAC)
("Evacuation ")
→ →
FIRE PURG)
("Smoke Purge ")
→ →
UNIT C.TYP) during
("Disabled ") OFF
Fig. F — Internal Enclosure Fan Replacement
HVAC mode:
}
Else If: The "soft stop" command (Service Test
is forced to YES:
{
HVAC mode:
}
Else If: The remote switch config (Configuration
→
UNIT RM.CF)=2; "start/stop", and the remote
input state (Inputs
{
HVAC mode:
}
Else If: Configured for static pressure control
→
(Configuration
pressure sensor (Pressures
{
HVAC mode:
}
Else If: Configured for supply fan status monitoring
(Configuration
configured to shut the unit down on fan status fail
(Configuration
{
HVAC mode:
Else If: The unit is just waking up from a power reset
{
HVAC mode:
}
152
A48-7716
("Test ")
("SoftStop Request")
→ →
GEN.I REMT)=ON:
("Rem. Sw. Disable") OFF
→
SP SP.CF = 1,2) and the static
→ →
AIR.P SP) fails:
("Static Pres.Fail") OFF
→ →
UNIT SFS.M = 1,2) and
→ →
UNIT SFS.S = YES)
("Fan Status Fail ") OFF
("Starting Up ") OFF
→
S.STP)
→