Honeywell Mabs Ez 2 Manual

PRODUCT DATA
69- 1360- 2® U.S. Registered Trademark
Copyright © 2001 Honeywell •  All Rights Reserved 
Mastertrol® Automatic Balancing System™
(MABS®) EZ Zone (EZ-2 and EZ-4)
 Control Panels
APPLICATION
The MABS EZ-2 and EZ-4 are microprocessor-based forced 
air zone control panels that provide automatic or manual 
changeover control of single- and two-stage heating and 
cooling and heat pumps with or without auxiliary heat.
FEATURES
• MABS EZ-2 controls two zones and MABS EZ-4 control 
four zones. For...

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the 
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write  or 
phone: 1. Your local Home and Building Control Sales Office (check white...

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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Dampers: See Fig. 3-7 for hookup drawings. See Table 2 for 
recommended dampers.Accessories:
For required accessories, see Table 3.
INSTALLATION
Mounting
CAUTION
Equipment Damage Hazard.
Do not mount MABS EZ inside HVAC equipment.
Mount only on wall or on cold air return
1.Mount the thermostats in each zone of the living space 
using the installation instructions provided with each 
thermostat.
2.Mount the...

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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Wiring Diagrams
See Table 1 for recommended thermostats. See Fig. 1-15 for 
wiring appropriate wiring diagrams.
NOTE: The common wire (C to M1) is used only on thermo-
stats that require it.
Fig. 1. Typical single-stage thermostat hookup diagram.
Fig. 2. Heat pump thermostats with separate heat and 
cool outputs.
Use only thermostats listed in Table 1.
Fig. 3. AOBD damper wiring (single).NOTE: Wiring is the...

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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Fig. 7. ML6161 Damper Motor Actuator wiring diagram.
NOTE: The R8222 relay is not required for operation, but if it 
is not used, the zone damper LED will be constantly 
green.
Fig. 8. Transformer wiring diagram.
NOTE: A dedicated 40 VA, 24 Vac transformer must be 
used.
Fig. 9. ZoneMAX or C7735 Sensor wiring diagram.Fig. 10. Single-stage heating and cooling equipment 
wiring diagram.
NOTES:
— Electric...

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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Fig. 12. Two-stage heating and cooling wiring diagram.
NOTE: The stage timer energizes the second stage equip-
ment.
Fig. 13. Heat pump wiring diagram.
IMPORTANT
Y1 must be jumped to W1 for compressor control. 
Set DIP switch 8 to On to energize the fan with a call 
for heat.
NOTES:
— Fossil Fuel Kits with Heat Pumps: The wiring for 
these heat pumps is similar but the manufac-
turers fossil fuel control...

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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Fig. 14. MABS EZ-2 wiring diagram.
C
123X 4567GY RWC
ZONE 2 THERMOSTAT
24V, 40 VA
TRANSFORMER
M19046AAUTOMATIC ROUND DAMPER
POWERE CLOSED (ARD-PC) OPPOSED BLADE 
DAMPERMOTOR ZONE 1 THERMOSTAT ZONE THERMOSTAT
ZONE DAMPERSGY RW THIS DIAGRAM SHOWS TYPICAL
SINGLE-STAGE THERMOSTAT
AND DAMPER MOTOR CONNECTIONS.W2 E
W1
B
G
R
O
Y1
Y2 TL TL
G L
ZONE 12ND STG. EMG.THERMOSTAT MOTOR
YRWM6M4M1
CR TR1 TR2
HEAT
SECOND...

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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Fig. 15. MABS EZ-4 wiring diagram.
STARTUP AND CHECKOUT
After the installation is complete, verify the operation:
1.Put the Em Heat switch in the off (down) position.
2.Be sure the DIP switches are set correctly. See 
Sequence of Operation and Table 6 for correct configu-
ration. The default position is in the off (down) position. 
3.Power up the MABS EZ and set the thermostats so no 
zones are calling....

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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OPERATION
Sequence of Operation
On a call for heating or cooling, the zone damper to the calling 
zone stays open, and the dampers close to the zones that are 
not calling. The MABS EZ panel brings on the heating or 
cooling and conditioned air is delivered to the calling zone 
until the zone is satisfied. When the call is satisfied, the 
system enters the Purge mode. This holds open the damper 
of the last...

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
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LED Indicators
The panel features several LED status indicators visible 
through a window in the cover. See Table 6.
Re-Booting the Microprocessor
When conditions hang up the microprocessor, press and 
release the Boot button to re-boot the system and enter the 
Purge mode.
ZoneMAX Sensor Leaving Air Temperature Sensor
The ZMS (not included) is a duct-mounted temperature probe 
that monitors the supply of...