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Instruction Manual for Honeywell models including: MARD-5, MARD-6, MARD-7, MARD-8, MARD-9, MARD-10, MARD-12, MARD-14, MARD-16, MARD-18, MARD-5 Modulating Automatic Round Damper, MARD-5, Modulating Automatic Round Damper, Automatic Round Damper, Round Damper, Damper
MARD-14-Honeywell MARD-14 Damper 14" Round With 24V 3-Wire Floating Actuator - Industrial Stores
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DocumentDocumentModulating Automatic Round Damper (MARD) APPLICATION The Modulating Automatic Round Damper is a round damper with a 24-Vac, floating-control type modulating motor for bypass and zone damper control. It is constructed of 22-gauge galvanized steel and has male (crimped) and female (uncrimped) ends to connect to any rigid or flexible round duct. It is available in 5, 6, 7, 8, 9, 10, 12, 14, 16, 18 inch diameter sizes. The motor timing is 90 seconds open to closed. The MARD is used for bypass control when connected to the Static Pressure Switch (SPC). Although it can be used on any bypass application, it is recommended for systems larger than 2000 cfm. The MARD can also be used as a zone control damper connected to a zone control panel. INSTALLATION Before Installing this Product... 1. Read all instructions before installing this product. Failure to follow the instructions can damage the product or cause a hazardous condition. 2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. 3. Installer must be a trained, experienced service technician. 4. Install the product in an area that is easily accessible for checkout and service. 5. After completing installation, use these instructions to check out the product operation. Selecting Damper Size 1. To size the bypass damper, subtract the smallest zone cfm from the total system cfm. The remainder is the amount of air that needs to be bypassed. 2. Calculate the bypass damper size using this cfm and a friction loss of .25 in. on a duct calculator or see Table 1. 3. If used as a zone damper, size it the same diameter as the duct. INSTALLATION INSTRUCTIONS Table 1. MARD Size. MARD Diameter 5 6 7 8 9 10 12 14 16 18 Bypass cfma 120 200 300 400 600 750 1200 1800 2400 3200 aUse this table only to size bypass dampers; for zone damper sizing, use a duct calculator. Selecting Damper Location The damper can be installed horizontally or vertically. Orient the damper so the motor is located on the side or top of the damper, not on the bottom of the damper. Mounting the Damper 1. Install a duct collar into the duct or plenum upstream of any zone dampers. It is preferable to place it as far as practical from the air handler. 2. Slide the damper onto the duct collar. 3. Secure with sheet metal screws (not provided). 4. Run duct from the other end of the damper to the return duct. ® U.S. Registered Trademark Copyright © 2002 Honeywell · ·All Rights Reserved 69- 1551- 1 MODULATING AUTOMATIC ROUND DAMPER (MARD) 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. W8703A OPEN CLOSE OPEN CLOSE OPEN CLOSE 1 2 3 TR1 TR2 COM ZONE C ZONE B ZONE A L1 (HOT) L2 EXTERNAL 40 VA TRANSFORMER SPC C NC NO MARD CW COM CCW MODEL PMT-40 24 VAC TRANSFORMER LINE VOLTAGE M20135A 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. MARD CW COM CCW M20137A Fig. 2. Wiring MARD to W8703 Networked Zoning Damper Interface Module. MARD CW COM CCW ZONE PANEL CONNECTIONS M1 M4 M6 M20136A Fig. 3. Wiring MARD to a conventional zone panel. MARD CW COM CCW ZONE PANEL CONNECTIONS M1 M4 M6 MARD CW COM CCW M20138A Fig. 4. Wiring two MARD in tandem to a zone panel. Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-1551-1 G.H. Rev. 02-02 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. www.honeywell.com/yourhome