Honeywell AQ25A Series Technical Reference Booklet page 64

AQ250 SERIES HYDRONIC CONTROL PANELS
4. Pressing the Test button at any time during the Auto Test
routine pauses the routine indefinitely. While paused, the
Diagnostic LED blinks slowly.
5. Pressing the Test button while the Auto Test routine is
paused advances the routine to the start of the next step
in the routine (testing the next zoning output) and the
Auto Test routine resumes its test procedure.
6. When the Auto Test routine is completed, the Diagnostic
LED returns to a constant ON status (no blinking).
7. Replace the DIP switch cover on the Zoning Module.
8. For each AQ155/AQ157 Zoning Module connected to
the AQ250, repeat steps 1-7.
SEQUENCE OF OPERATION—AQ155/AQ157 ZONING MODULES
1. When the Auto Test button is pressed, Zone 1 of the
Zoning Module is energized and the Diagnostic LED on
the AQ155/AQ157 begins to blink quickly.
2. Zone 1 remains energized for 15 seconds, then shuts off.
3. Next, each of the remaining zones is energized,
sequentially for 15 seconds, starting with Zone 2, and
then shuts off.
4. After Zone 4 has de-energizes, the AQ155/AQ157 exits
the Auto Test routine and the Diagnostic LED on the
Module returns to steady illumination (no blinking).
C) End Auto Test
If no errors are detected in the Control Module or Zoning
Module Auto Test routines, the AQ250 is now ready for
operation. If errors are detected, refer to "Troubleshooting" on
page 19.
68-0306—02
Checkout
1. If present, turn down the DHW Aquastat to avoid interfer-
ing with space heating control operation.
2. Turn up the setpoint of one of the AQ1000 zone
thermostats.
2.1 The zone valve or pump associated with that zone
turns on.
2.2 The Boiler and T-T relay outputs energize.
NOTE: When a setpoint is changed on an AQ1000
thermostat, the AQ250's boiler short cycle
protection is disabled in favor of a faster
reaction for the user.
3. Turn down the setpoint of one of the AQ1000 zone
thermostats.
3.1 The zone valve or pump associated with that zone
should turn off.
3.2 The Boiler, and T-T relay outputs should de-energize.
4. Repeat steps 2 and 3 for all zones to verify each zone is
operating correctly. Thermostats may be exercised
individually or all together to accelerate the check out
process.
5. Turn up the DHW Aquastat to simulate a call for hot
water.
5.1 If the DHW device is a pump, the DHW relay output
energizes immediately, and the Boiler pump relay
remains off.
5.2 If the DHW device is a valve, the Boiler pump relay
energizes after a 15 second delay to allow the zone
valve to fully open.
5.3 Turn up the set point of one of the AQ1000 zone
thermostats.
5.3.1 If the DHW relay is configured to control a
pump, and DHW Priority is selected, the
Boiler and associated zone pumps relays
remain off.
5.3.2 If the DHW relay is configured to control a
valve, and DHW Priority is selected, the
associated zone relays remain off.
5.3.3 If DHW Priority is disabled, space heating
(zone pumps and valves) operates normally
even during a call for DHW.
6. Turn down the DHW Aquastat to end the call for hot
water. Space heating operation should continue (if DHW
priority is disabled) or resume (if DHW PRIOrity is
enabled).
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