2Sp H/C And 3 Speed Fan Operation; Checkout; Troubleshooting; Rtu Open Controller (Factory Option) - Carrier WeatherMaster 50GC 04-06 Series Installation Instructions Manual

2SP H/C AND 3 SPEED FAN OPERATION

FAN TYPE = 2SP H/C and FAN TYPE = 3SPEED are not used
on 50GC units.

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 26.
WARNING
ELECTRIC SHOCK HAZARD
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 and 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 7) 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 26.
Checkout Tests
Use the Checkout menu (see page 31) 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 26.
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.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
Be sure to allow enough time for compressor start-up and shut-
down 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
removed (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.

RTU Open Controller (Factory Option)

For details on operating 50GC**04-06 units equipped with the
factory-installed RTU Open controller option, refer to the Factory-
Installed Option RTU Open Multi-Protocol Controller Controls,
Start-Up, Operation and Troubleshooting manual.
SystemVu™ Controller (Factory Option)
For details on operating 50GC**04-06 units equipped with the
factory-installed SystemVu controller option, refer to the FC/GC
Series Single Package Rooftop Units with SystemVu Controller
Controls, Start-up, Operation and Troubleshooting manual.

Controller Options

LOW AMBIENT

If the unit comes with Electro-Mechanical (EM) control, then no
adjustment is necessary.
If the unit comes with SystemVu™ or RTU Open control option,
then refer to its installation control manual for details on adjusting
"Cooling Lock-Out" setting and configure for the specific job re-
quirements.

Smoke Detectors

Smoke detectors are available as factory-installed options on
50GC models. Smoke detectors may be specified for supply air
only, for return air without or with economizer, or in combination
of supply air and return air. Return-air smoke detectors are ar-
ranged for vertical return configurations only. All components
necessary for operation are factory-provided and mounted. The
unit is factory-configured for immediate smoke detector shutdown
operation; additional wiring or modifications to unit control board
35
CAUTION