Honeywell AQ15540B, Product Data

AQ255 AND AQ257 SERIES EXPANSION ZONING PANELS

69-1981—06

4

Fig. 2. AQ257 Expansion Zoning Panel Layout (AQ25744B

shown).

2 MOUNTING

This section describes how to mount the Expansion Zoning 

Panels and thermostats.

Mount Expansion Zoning Panel(s)

1.

Remove wire channel plugs from the Control Panel and 

any Expansion Panels (see Fig. 3).

2.

Mount Expansion Zoning Panel on the right-hand end of 

the Main Control Panel.

3.

Reverse wire channel plugs and re-insert them into their 

slot to from a wiring channel between the Main Control 

Panel and the Expansion Zoning Panel (see Fig. 3) and 

to connect the two panels together.

4.

Install two top screws of the Expansion Zoning Panel, 

ensuring it is level with the adjoining Main Control Panel, 

and install two lower screws.

5.

Repeat steps 1–4 for any additional Expansion Zoning 

Panels.

Fig. 3. Orientation of wire channel plugs for creating pass-through wire channel and 

for joining Main Control Panel to Expansion Zoning Panels. 

LOW VOLTAGE

(24 V)

LOW VOLTAGE

(24 V)

TRANSFORMER

ZONING MODULE

M27832A

Zone 1

Zone 2

Zone 3

Zone 4

LOW 

VOLTAGE

(24 V)

LINE 

VOLTAGE

(120 V)

M13757