36
Specifications subject to change without notice.
36
2SP H/C and 3 Speed Fan Operation
FAN TYPE = 2SP H/C and FAN TYPE = 3SPEED are not
used on RHW units.
CHECKOUT
Inspect all wiring connections at the economizer module’s
terminals, and verify compliance with the installation wiring
diagrams. For checkout, review the Status of each config
-
ured parameter and perform the Checkout tests.
NOTE: For information about menu navigation and use of
the keypad see Interface Overview on page 28.
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
economizer 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 9) 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 28.
Checkout Tests
Use the Checkout menu (see page 32) 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 28.
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 in
-
stallation 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 dis
-
play 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
devices (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 activity for at least 5 minutes, the Alarms menu dis
-
plays 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 redis
-
played within 5 seconds.
Controller Options
LOW AMBIENT
If the unit comes with Electro-Mechanical (EM) control, then
no adjustment is necessary.
If the unit is equipped with a third party controller, then refer
to its installation control manual for details on adjusting
“Cooling Lock-Out” setting and configure for the specific job
requirements.
Smoke Detectors
Smoke detectors are available as factory-installed options
on RHW models. Smoke detectors may be specified for
Supply Air only or for Return Air without or with economiz
-
er, or in combination of Supply Air and Return Air. Return
Air smoke detectors are arranged for vertical return config
-
urations only. All components necessary for operation are
factory-provided and mounted. The unit is factory-config
-
ured for immediate smoke detector shutdown operation;
additional wiring or modifications to unit terminal board
may be necessary to complete the unit and smoke detec
-
tor configuration to meet project requirements.
Units equipped with factory-optional Return Air smoke de
-
tectors require a relocation of the sensor module at unit
installation. See Fig. 47 for the as-shipped location.
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 re
-
move power from the Economizer module before start
-
ing work. Pay particular attention to verifying the power
connection (24 Vac).
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.
Summary of Contents for RHW036-060
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