Pre-Start-Up/Start-Up - Carrier 48FC 08-16 Series Service And Maintenance Instructions

CHECKOUT
Inspect all wiring connections at the economizer module's termi-
nals, and verify compliance with the installation wiring diagrams.
For checkout, review the Status of each configured parameter and
perform the Checkout tests.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 60.
WARNING
Failure to follow this warning could result in personal injury,
property damage, or death.
Before performing service or maintenance operations on unit,
always turn off main power switch to unit and install lock(s)
and lockout tag(s). Unit may have more than one power
switch. Ensure electrical service to rooftop unit agrees with
voltage an amperage listed on the unit rating plate.
If any wiring changes are required, first be sure to remove
power from the Economizer module before starting work. Pay
particular attention to verifying the power connection (24 vac).
Power Up
After the W7220 module is mounted and wired, apply power.
Initial Menu Display
On initial start up, Honeywell displays on the first line and econo-
mizer W7220 on the second line. After a brief pause, the revision
of the software appears on the first line and the second line will be
blank.
Power Loss (Outage or Brownout)
All setpoints and advanced settings are restored after any power
loss or interruption.
NOTE: All settings are stored in non-volatile flash memory.
Status
Use the Status menu (see Table 19) to check the parameter values
for the various devices and sensors configured.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 60.
Checkout Tests
Use the Checkout menu (see page 64) to test the damper operation
and any configured outputs. Only items that are configured are
shown in the Checkout menu.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 60.
To perform a Checkout test:
1. Scroll to the desired test in the Checkout menu using the
▲ and ▼ buttons.
2. Press the (Enter) button to select the item. RUN?
appears.
3. Press the (Enter) button to start the test. The unit
pauses and then displays IN PROGRESS. When the test is
complete, DONE appears.
4. When all desired parameters have been tested, press the
(Menu Up/Exit) button to end the test.
The Checkout tests can all be performed at the time of installation
or at any time during the operation of the system as a test that the
system is operable.
CAUTION
Failure to follow this caution may result in damage to
equipment. Be sure to allow enough time for compressor
startup and shutdown between checkout tests so that you do
not short-cycle the compressors.
TROUBLESHOOTING
Alarms
The economizer module provides alarm messages that display on
the 2-line LCD.
NOTE: Upon power up, the module waits 60 minutes before
checking for alarms. This allows time for all the configured devic-
es (e.g., sensors, actuator) to become operational. The exception is
the SAT sensor which will alarm immediately.
If one or more alarms are present and there has been no keypad ac-
tivity for at least 5 minutes, the Alarms menu displays and cycles
through the active alarms.
You can also navigate to the Alarms menu at any time.
Clearing Alarms
Once the alarm has been identified and the cause has been re-
moved (e.g., replaced faulty sensor) the alarm can be cleared from
the display.
To clear an alarm, perform the following:
1. Navigate to the desired alarm.
2. Press the (Enter) button. ERASE? displays.
3. Press the (Enter) button. ALARM ERASED displays.
4. Press the (Menu Up/Exit) button to complete the
action and return to the previous menu.
NOTE: If the alarm still exists after clearing it, it is redisplayed
within 5 seconds.

PRE-START-UP/START-UP

PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal injury or
death.
1. Follow recognized safety practices and wear approved Per-
sonal Protective Equipment (PPE), including safety glasses
and gloves when checking or servicing refrigerant system.
2. Do not use a torch to remove any component. System
contains oil and refrigerant under pressure. To remove a
component, wear PPE and proceed as follows:
a. Shut off all electrical power to unit. Apply applicable
lockout/tag-out procedures.
b. Recover refrigerant to relieve all pressure from sys-
tem using both high-pressure and low pressure ports.
c. Do not use a torch. Cut component connection tubing
with tubing cutter and remove component from unit.
d. Carefully un-sweat remaining tubing stubs when nec-
essary. Oil can ignite when exposed to torch flame.
3. Do not operate compressor or provide any electric power
to unit unless compressor terminal cover is in place and
secured.
4. Do not remove compressor terminal cover until all electri-
cal power is disconnected and approved lockout/tag-out
procedures are in place.
5. Relieve all pressure from system before touching or dis-
turbing anything inside terminal box whenever refrigerant
leak is suspected around compressor terminals.
6. Never attempt to repair a soldered connection while
refrigerant system is under pressure.
68
WARNING