Honeywell AQ25A Series Technical Reference Booklet page 58

AQ250 SERIES HYDRONIC CONTROL PANELS
1. Boiler Pump
Connect the N and L wires of the boiler loop pump to the N and
switched hot ( ) terminals of the line voltage Boiler output,
shown in Fig. 17. The ground wire of the pump can be
connected to any of the 6 ground screw terminals located on
the back surface of the Control Panel enclosure.
NOTE: If the AQ250 is connected to a modulating
condensing boiler, the boiler pump may need to be
connected to the boiler, not the AQ250. Confirm this
with the boiler's installation manual.
2. DHW Aquastat Device
Wire the DHW pump or line voltage zone valve to the N and
switched hot ( ) terminals of the DHW output, as shown in
Fig. 17.
If using a low voltage zone valve, wire the primary of a spud-
mounted transformer (115V to 24V) to the DHW line voltage
contacts and connect the low voltage zone valve to the
secondary terminals of this transformer. A spud-mounted
transformer may be located in one of the conduit knockouts on
the bottom of the AQ250 Control Panel.
The DHW contacts are made when the DHW inputs on
terminals 9 and 10 are shorted by the controlling Aquastat.
When DHW Priority is enabled, the system has a 30 minute
priority over all calls for heat. After 30 minutes, calls for heat
are added back in to the operation for 30 minutes and then
turned off again, if the DHW demand is still active in the
system. This repeats until the DHW is satisfied.
DO NOT WIRE THE BOILER LOOP CIRCULATOR TO THE BOILER'S AQUASTAT TERMINALS C1/C2; IT MUST BE CONNECTED TO THE BOILER PUMP
1
TERMINALS ON THE BOTTOM OF THE AQ15000B CONTROL MODULE WHEN MAINTAINING A MINIMUM BOILER TEMPERATURE (WITH A TRIPLE
FUNCTION AQUASTAT).
2
FOR INSTALLATIONS USING A TRIPLE FUNCTION AQUASTAT, NOTE THAT THE FACTORY-INSTALLED JUMPER BETWEEN THE ZR AND ZC TERMINALS
OF THE AQ15000B CONTROL MODULE MUST BE REMOVED. THE ZR AND ZC TERMINALS ON THE AQ15000B CONTROL MODULE MUST BE WIRED TO
THE ZR AND ZC TERMINALS, RESPECTIVELY, OF THE TRIPLE AQUASTAT.
68-0306—02
JUMPERED
AT FACTORY
2
FROM LINE VOLTAGE
120V TERMINALS
(N AND L) ON BOTTOM
OF TRANSFORMER
Fig. 17. Wiring for Boiler Pump, and DHW Device.
NOTE: If the AQ250 is connected to a modulating
condensing boiler, the DHW pump will probably need
to be connected to the boiler, not the AQ250. Confirm
this with the boiler's installation manual.
3. Line Voltage Rated Aux Output (optional)
To connect a line voltage auxiliary device to these contacts,
such as a boiler bypass pump, power the device from the N
and L terminals on the bottom of the Control Module, running
the hot (L) lead through the Aux. Pump contacts. See Fig. 16
for details. The exact wiring schematic will depend on what is
connected to these dry contacts.
NOTE: Use of this output is optional. The Aux. pump dry
contacts are line voltage-rated but unpowered. A low
voltage device can be connected to these contacts,
but the wire's insulation must meet applicable codes
for use in line voltage enclosures.
Fig. 16. Wiring of the Aux. pump line voltage rated dry
contacts (example shown is a by-pass pump).
TO AUXILIARY DEVICE
(INSTALLER-DEFINED)
1
12
BY-PASS PUMP M29045A
M29044A