Carrier 50HCQ12, Руководство по установке

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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 is
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 12) 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 31.
Checkout Tests
Use the Checkout menu (see page 36) 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 31.
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.
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.
SMOKE DETECTORS
Smoke detectors are available as factory-installed options on
50HCQ models. Smoke detectors may be specified for Supply
Air only or for Return Air without or with economizer, or in
combination of Supply Air and Return Air. Return Air smoke
detectors are arranged 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 terminal board may be necessary to complete the unit and
smoke detector configuration to meet project requirements.
Units equipped with factory-optional Return Air smoke detectors
require a relocation of the sensor module at unit installation. See
Fig. 52 for the as-shipped location.
Completing Return Air Smoke Sensor Installation
1. Unscrew the two screws holding the Return Air Smoke
Detector assembly. See Fig. 53, Step 1. Save the screws.
2. Turn the assembly 90 degrees and then rotate end to end.
Make sure that the elbow fitting is pointing down. See
Fig. 53, Step 2.
3. Screw the sensor and detector plate into its operating posi -
tion using screws from Step 1. See Fig. 53, Step 3.
4. Connect the flexible tube on the sampling inlet to the sam -
pling tube on the basepan.
Staged Air Volume (SAV™) with Variable
Frequency
Drive (Factory-Installed Option)
For details on operating 50HCQ 2-stage cooling units equipped
with the factory-installed Staged Air Volume option, refer to the
Variable Frequency Drive (VFD) Installation, Start-Up and Ser -
vice Instructions.
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).
CAUTION
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.