46
TWO-SPEED FAN OPERATION
The W7220 controller has the capability to work with a
system using a 2-speed supply fan. The W7220 does not con-
trol the supply directly but uses the input status to determine
the speed of the supply fan (see Table 19) and controls the
OA damper to the required position.
Table 19 — W7220 Control, 2-Speed Supply Fan
The W (heating mode) is not controlled by the W7220 but it
requires the status to know where to position the OA damper for
minimum position for the fan speed.
The 2-speed fan delay is available when the system is pro-
grammed for 2 speed fan (in the System Setup menu item). The
2-speed fan delay is defaulted to 5 minutes and can be changed
in the Advanced Setup menu item. When the unit has a call for
Y1 In and in the free cooling mode and there is a call for Y2 In,
the 2-speed fan delay starts and the OA damper will modulate
100% open, and the supply fan should be set to high speed by the
unit controller.
After the delay one of two actions will happen:
• The Y2 In call will be satisfied with the damper 100%
open and fan on high speed and the call will turn off, OR
• If the call for additional cooling in the space has not been
satisfied then the first stage of mechanical cooling will be
enabled through Y1 Out or Y2 Out.
CHECKOUT
Inspect all wiring connections at the economizer module’s
terminals, and verify compliance with the installation wiring dia-
grams.
For checkout, review the Status of each configured parameter
and perform the Checkout tests.
NOTE: See “Interface Overview” on page 35 for information
about menu navigation and use of the keypad.
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. All settings are stored in non-volatile
flash memory.
Status
Use the Status menu (see Table 8) to check the parameter val-
ues for the various devices and sensors configured.
NOTE: See “Interface Overview” on page 35 for information
about menu navigation and use of the keypad.
Checkout Tests
Use the Checkout menu (see Table 8) to test the damper oper-
ation and any configured outputs. Only items that are configured
are shown in the Checkout menu.
NOTE: See “Interface Overview” on page 35 for information
about menu navigation and use of the keypad.
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, then displays IN PROGRESS. When the test is
complete, DONE appears.
4. When all desired parameters have been tested, press the
(Menu up) 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 de-
vices (e.g. sensors, actuator) to become operational. The excep-
tion 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 nav-
igate 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 dis-
plays.
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.
STATE
FAN SPEED
OCC
Low
Y1
Low
Y2
High
W
High
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or
death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lock(s)
and lockout tag(s). Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit rating
plate. Unit may have more than one power switch.
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
Failure to follow this caution may result in damage to
equipment. 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.
Summary of Contents for WeatherMaster 50HC*A07 Series
Page 4: ...4 Fig 2 Unit Dimensional Drawing Sizes 07 09 ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing Sizes 07 09 cont ...
Page 6: ...6 Fig 3 Unit Dimensional Drawing Sizes 11 and 12 ...
Page 7: ...7 Fig 3 Unit Dimensional Drawing Sizes 11 and 12 cont ...
Page 25: ...25 Fig 42 Electro Mechanical Control Wiring Diagram ...
Page 26: ...26 Fig 43 Electro Mechanical Control Wiring Diagram with Humidi MiZer System ...
Page 27: ...27 Fig 44 Typical ComfortLink Control Wiring Diagram 50HC 08 09 shown ...
Page 29: ...29 Fig 46 Typical PremierLink Control Wiring Diagram ...
Page 30: ...30 Fig 47 Typical PremierLink Control Wiring Diagram with Humidi MiZer System Option ...
Page 31: ...31 Fig 48 Typical RTU Open Controller Wiring Diagram ...
Page 32: ...32 Fig 49 Typical RTU Open Controller Wiring Diagram with Humidi MiZer System Option ...
