AQ25A SERIES PROGRAMMABLE BOILER CONTROL PANELS
31 69-2119—02
BOILER OPERATION
CYCLES/HOUR 2 to 6 4 The number of heating cycles per hour that the control will
operate the boiler
FIRE DELAY 0 seconds to 3 minutes
(in 5 second increments)
10
(seconds)
Time period that AQ25A control expects between closing
the T-T relay and the boiler firing up. Referring to the
boiler's instruction manual, set this value equal to the
boiler's pre-purge time, if available for the boiler.
PURGE TIME OFF, 10 seconds to
30 minutes
(in 10 second increments)
30
(seconds)
Length of time the Boiler pump (or Boiler pump plus zone
valve) will continue to operate (remain open) after the
boiler stops firing. Adjustable from 10 seconds to
30 minutes or OFF.
EXERCISE YES / NO YES Option can be set to YES or NO. When set to YES, all
pumps and valves in the system are energized for
30 seconds following a period of 2 weeks of no zone
equipment activity. The boiler is not fired during this
operation.
FREEZE PROT YES / NO YES Option can be set to YES or NO. When set to YES, all
pumps and valves in the system are energized for
4 minutes every hour. The boiler is operated at high fire
during this operation.
10V MOD. SELECT Operating settings for the analog 0-10V (2-10V) modulating signal
10V MOD 0-10V / 2-10V 0-10V The analog signal provided by the control to the boiler is
proportional to the target firing rate of the boiler calculated
by the AQ25A. This firing rate will produce a constant
boiler supply water temperature (typically equal to the
BOILER HIGH LIMIT) for as long as any zone is calling for
heat.
USAGE NONE / BOILER NONE This setting assigns the device which the analog signal will
drive. The NONE option disables a signal from the 10V
output.
DOMEST.HOT
WATER
Settings that the AQ25A uses to manage Domestic Hot Water generation
DHW ENABLE / DISABLE ENABLE Identifies whether Domestic Hot Water Management
function is enabled. DHW is typically disabled only if a
separate source of domestic hot water (e.g., oil, or gas-
fired hot water heater) is used.
DHW PRIO YES / NO NO Displays only if DHW = ENABLE.
Selects whether DHW generation can take priority over
space heating. If yes, set to YES; if not, set to NO.
PRIO.OVER. YES / NO YES Displays only if DHW PRIO = YES.
Selects whether (following a 30 minute uninterrupted call
for DHW Demand) the priority given to DHW generation
can be overridden to minimize the chance of freeze up or
excessive cool down of the space heating zones.
• YES = On = Allow DHW Priority override.
• NO = Off = Do not allow DHW Priority override.
If DHW Priority is selected, Honeywell strongly
recommends setting the DHW PRIOR.OVER to YES.
DHW DEVICE PUMP / VALVE PUMP Displays only if DHW = ENABLE.
Selects whether the DHW loop is supplied by a zone valve
or zone pump.
DHW VLV.OP 0 - 230 seconds
(in 5 second increments)
15
(seconds)
Displays only if DHW DEVICE = VALVE.
Time required for the DHW zone valve to fully open before
boiler loop pump is energized.
The 15 second default is typical for motorized valves.
Table 6. Installer Menu – Equipment Setup. (Continued)
EQUIPMENT SETUP
Menu Option Range
Factory
Default Description
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