MARD Installation Instructions

69-1551-1 G.H. Rev. 02-02 www.honeywell.com/yourhome
MODULATING AUTOMATIC ROUND DAMPER (MARD)
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
WIRING
The ML6161B2024 motor has a 35 in.-lb, 3 VA, 24 Vac,
50/60 cycle rating. Protect the HVAC equipment from
freeze-up and from tripping the high limit with a discharge
air temperature sensor as follows:
• C7735A1000 on the TZ-3, EMM-3, EMM-3U, EZ-2 or
EZ-4 zone control boards
• C7835A1009 on Networked Zoning
• FPC and T6031A1276 (SPBT) on older zone control
boards.
Multiple dampers can be connected in parallel. See Fig.
1-4. See the SPC literature for additional connection
information.
Fig. 1. Wiring SPC to control MARD damper in
bypass application.
Settings/Adjustment
See the SPC literature for configuration instructions.
CHECKOUT
To check out the MARD:
1. With 24 Vac applied to the M1 (common) and M4
(open) terminals, observe that the motor powers
the MARD to the open position.
2. With 24 Vac applied to the M1 (common) and M6
(close) terminals, observe that the motor powers
the MARD to the closed position.
Fig. 2. Wiring MARD to W8703 Networked Zoning
Damper Interface Module.
Fig. 3. Wiring MARD to a conventional zone panel.
Fig. 4. Wiring two MARD in tandem to a zone panel.
SPC
CW
COM
CCW
MARD
LINE VOLTAGE
MODEL PMT-40
24 VAC TRANSFORMER
M20135A
C NC NO
M20137A
W8703A
L1
(HOT)
L2
EXTERNAL
40 VA
TRANSFORMER
ZONE AZONE B
ZONE C
CLOSE
OPEN
OPEN
CLOSE
OPEN
CLOSE
COM
TR1
TR2
2
3
1
CW
COM
CCW
MARD
M1 M4
M20136A
ZONE PANEL
CONNECTIONS
M6
CW
COM
CCW
MARD
M1 M4
M20138A
ZONE PANEL
CONNECTIONS
M6
CW
COM
CCW
CW
COM
CCW
MARD
MARD