Honeywell AQ25A Series Technical Reference Booklet page 122

AQ252 Universal Injection/Mixing Boiler Reset Control Panels
valves. The valve logic induces a delay before
activating the boiler pump even when zone pumps
are used. When Zone Synchronization is not
selected, the zone demands are served whenever
they call for heat.
• The Zone Synchronization feature replaces the
pump/valve selection of previous AQ2000 versions.
3. DIP Switch 8 functionality:
• The factory setting enables 1-stage per zone
thermostat. The zoning module operates as four 1-
stage zones.
• When using a 2-stage thermostat, set DIP switch 8
to 2-Stg. The 2-stage selection uses TH1 and TH2
inputs for 2-stage thermostat control. For the
selected zone, TH1 is the first stage input from the
thermostat and TH2 is the second stage input.
Inputs TH3 and TH4 operate in same manner. The
2-stage selection reduces the zoning module to a 2
zone module from a 4 zone module.
Table 2. AQ15540B Zoning Module (Pump Zoning Module) DIP Switch Arrangement.
DIP
Switch
1 Zone Address: The positions of these 4 DIP switches define the unique address for
2 each zone on the AQUATROL network. For each group of 4 zones, there can be only
3 one DIP switch in the right hand (ON) position.
4
The correct DIP switch settings for each zone module are:
• First Zone (1-4) Module:
• Second Zone (5-8) Module: 2 = ON position; 1, 3, and 4 = OFF position
• Third Zone (9-12) Module:
• Fourth Zone (13-16) Module: 4 = ON position; 1, 2, and 3 = OFF position
• If set to SYNC, zone synchronization is enabled.
5 • If set to NOT, zone synchronization is disabled.
• If zone valves are normally closed (N.C.), set the NC/NO DIP switch to the OFF
position.
• If zone valves are normally open (N.O.), set the NC/NO DIP switch to the ON
6 position.
• If set to Group (ON position), the AUX Pump contacts on the Control Module are
switched when any of the zones on this Zoning Module are active.
• If set to - (OFF position), the AUX Pump contacts are not affected by activity on
7 these zones.
• If set to 2-Stg (ON position), then 2-stage operation is activated on thermostat
inputs. The zoning module operates as two 2-stage zones or 3 zones (one 2-stage
and two 1-stage).
8 • If set to 1-Stg (OFF position), then operates as four 1-stage zones.
69-1986—02
Review the settings of all DIP switches for each Zoning Module
connected to an AQ1520, to ensure they are correct before
system start-up.
When you finish setting the DIP switches for all the Zoning
Modules, replace the front cover of the AQ252 Control Panel
and the cover of each Expansion Zoning Panel.
NOTE: The snap-on DIP switch covers are designed so they
Switch Description
1 = ON position; 2, 3, and 4 = OFF position
3 = ON position; 1, 2, and 4 = OFF position
16
• When using digital 2-stage thermostats (non
AQ1000 thermostats), the system set-up process
changes slightly. During system set-up, create an
artificial demand on the zoning module by
increasing the set point on the thermostat. The
artificial demand is required during the PRI/SEC set-
up menu to select the primary and secondary loop
for each zone and stage.
cannot be removed (exposing the DIP switches)
when the front cover of the AQ252 Control Panel is in
place.
Label and Factory Settings
AQ15540B
Diagnostic
Diagnostic
Test
Test
M27696
M23720A