Honeywell AQ25A Series Technical Reference Booklet page 38

AQ25A SERIES PROGRAMMABLE BOILER CONTROL PANELS
Menu Option
DOMEST.HOT WATER (continued)
DHW PURGE YES / NO
DHW SENSOR YES / NO
DHW SETPOINT - -
60°F to 160°F (16°C to 71°C)
DHW DIFF - -
5°F to 40°F (2.5°C to 22°C)
DHW VACANCY - -
[41°F + DHW DIFF] to 160°F
([5°C + DHW DIFF] to 71°C)
ZONING Settings which the AQ25A uses specifically for Zone operation
HT DMND PRIO YES / NO
PRIO.OVER YES / NO
ZONING VALVES 5 - 230
TIME TO OPEN (seconds)
69-2119—02
Table 6. Installer Menu – Equipment Setup. (Continued)
EQUIPMENT SETUP
Factory
Range Default
YES
NO
140°F
(60°C)
20°F
(-7°C)
45°F
(7°C)
NO
NO
15
(seconds)
32
Description
Displays only if DHW = ENABLE.
Selects whether or not a purge should be applied after a
DHW demand has been served. If YES is selected, the
DHW pump or valve is kept running for the amount of time
programmed in the PURGE TIME option of the BOILER
OPERATION menu.
Selects whether or not the Return sensor will be used as a
DHW tank sensor. YES = use as the DHW sensor.
Displays only if DHW SENSOR = YES.
Target temperature set for the DHW tank.
• "- -" means Off (not used).
Displays only if DHW SENSOR = YES.
• "- -" means Off (not used).
• A call for DHW begins when the measured DHW
temperature = DHW SETPOINT - DHW DIFF and ends
when the DHW temperature = DHW SETPOINT.
• For example, if the DHW setpoint = 140°F and the DHW
Diff = 20°F, a call for DHW begins when the DHW
temperature falls below 120°F and ends when the DHW
temperature increases to 140°F.
Displays only if DHW SENSOR = YES.
Target DHW temperature when system is in VACANCY
mode.
• "- -" means Off (not used).
Selects whether a HEAT DEMAND (device connected to
the Heat terminals on the AQ control module) can take
priority over space heating. If yes, set to YES; if not, set to
NO.
• If both DHW Priority and Heat Demand Priority are set
to YES and both are active at the same time, DHW
Priority takes priority over Heat Demand Priority.
Displays only if HT DMND PRIO = YES.
Selects whether (following a 30 minute uninterrupted call
for Heat Demand) the priority given to the Heat Demand
can be overridden to minimize the chance of freeze up or
excessive cool down of the space heating zones.
• YES = On = Allow Heat Demand Priority override.
• NO = Off = Do not allow Heat Demand Priority override.
Time required for the zone valves installed on space
heating zones to fully open.