Honeywell AQ25A Series Technical Reference Booklet page 76

AQ251 SERIES BOILER RESET CONTROL PANELS
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FROM LOW VOLTAGE
24 VAC TERMINALS
(C AND R) ON TOP
OF TRANSFORMER
Fig. 12. Wiring an AQ15540B Zoning Module for use
with low voltage zone valves without end switches.
2. Low voltage zone valves with end switches:
See Fig. 13. 24 Vac power is pre-wired between the
transformer secondary at the top left of the AQ251's
transformer and the AQ15740B Zoning Module. No field
wiring is required.
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M
Fig. 13. Wiring an AQ15740B Zoning Module for use
with low voltage zone valves with end switches.
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M27689A
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NOTE: When wiring zone valves with end switches, note the
transformer's VA:
f low voltage zone valves with end switches are used
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for zone control, make sure the selected zone valves
do not draw more power (VA) than the 38 VA capacity
of the AQ10X38 transformer supplied with the AQ251
Control Panel. This integral transformer has enough
power to operate 4 motorized zone valves (such as
Honeywell V8043E valves or 4 valves using low-
amperage draw, heat motor actuators, such as
Honeywell MV100 actuators), plus power the
electronics of the AQ251's Control Module and up to
16, AQ1000 thermostats. If zone valves with high-
amperage-draw heat-motor actuators are used (such
as Taco 500 series zone valves), additional 24 Vac
transformer capacity will need to be wired to the
Zoning Module to power the valves. See Fig. 14 on
page 11 for recommended wiring of additional low
voltage VA capacity to AQ2000 Series Zoning
Modules.
CAUTION
Equipment Damage Hazard.
Can damage internal circuitry of Zoning Module.
The ES1 and ES2 terminals of the AQ15740B Zoning
Module are powered terminals and must only be
connected to a set of dry contacts, such as a zone
valve motor's end switch. If power is applied to these
contacts (for example, by running line voltage through
the zone valves' end switches to bring on a circulator
feeding those valves), the internal circuitry of the
Zoning Module will be damaged, in which case the
warranty for this product will be voided.
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