Instruction/ maintenance manual of the product MA US Modular
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819288-UIM-A-0212 MODULAR NON-V ARIABLE SPEED AIR HANDLERS MODELS: MA INSTALLATION MANUAL ISO 9001 Certified Quality Management System LIST OF SECTIONS GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
819288-UIM-A-0212 2 Unitary Products Group 1. Install this air handler only in a location and position as specified in SECTION III of these instructions. 2. Always install the air handler to operate within the air handler’s intended maximum outlet air t emperature.
819288-UIM-A-0212 Unitary Products Group 3 DOWNFL OW AND HORIZONT AL CONVERSION These air handler units are supplied r eady to be installed in a upflow , downflow and left or right hand horizontal position. If the unit is to be installed with an evaporator coil, refer to Figure 1 for unit positioning information.
819288-UIM-A-0212 4 Unitary Products Group DUCT CONNECT ORS Air supply and return may be handled in one of several ways best suited to the installation.
819288-UIM-A-0212 Unitary Products Group 5 Duct work should be fabricated and in stalled in accordance with local and/or national codes. This includes the standards of the National Fire Protection Association for Installation of Air-Conditioning and Ventilat- ing Systems, NFP A No.
819288-UIM-A-0212 6 Unitary Products Group SECTION V : LO W VOL T AGE CONTROL CONNECTIONS The 24 volt power supply is provi ded by an int ernally wired low voltage transformer which is standard on all model s, However, if the unit is con- nected to a 208 volt power supply , the low voltage transformer must be rewired to the 208 volt tap.
819288-UIM-A-0212 Unitary Products Group 7 External Relay Outputs The control includes thre e outputs to drive external relays having 24 V AC coils. The outputs have a maximum rating of 1.0 Amp pilot duty at 24 V AC. HUM OUT The HUM OUT output can be used to drive an external relay or solenoid (24 V AC coil) to control a humidifier .
819288-UIM-A-0212 8 Unitary Products Group SECTION VII: LINE POWER CONNECTIONS Power may be brought into the unit thr ough the supply air end of the unit (top when unit is vertical) or the left side panel. Use the hole appro- priate to the unit’s orientation in each installation to bring conduit from the disconnect.
819288-UIM-A-0212 Unitary Products Group 9 SECTION IX: UNIT D A T A TA B L E 7 : Physical and Electrical Data Models: MA MA08BN21 MA12BN21 MA12BN41 MA14DN21 Blower - Diameter x Width 10 x 9 10 x 9 10 x 9 10 x 10 Motor HP 1/4 HP 3/4 HP 3/4 HP 1/2 HP Nominal RPM 1075 1075 1075 1075 V oltage 208/230 208/230 460 208/230 Amps Full Load 1.
819288-UIM-A-0212 10 Unitary Products Group * May be 0 (no breaker) or 1 (with breaker). TA B L E 11 : Electrical Data - 1 Ø - 208/23 0-1-60 Models MA Heat Kit - Single Phase Max. Stat ic Min. Spe ed Ta p To t a l H e a t 1 KW St aging KW MBH W1 Only W2 Only W1 + W2 208V 240V 208V 240V 208V 240V 208V 240V 208V 240V 08BN21 4HK*6500206 0.
819288-UIM-A-0212 Unitary Products Group 11 * May be 0 (no breaker) or 1 (with breaker). T ABLE 13: Electrical D a t a - (For Single Source Power Supply) - Copper W ire 1 Ø - 208 /230-1-60 Models MA Heat Kit - Single Phase* Heater Amps Field W iring Min.
819288-UIM-A-0212 12 Unitary Products Group 2. Heaters are 3 Phase. T ABLE 15: Elect rical Data - (F or Multi-Source Power Supply) - Copper W ire 3 Ø - 2 08/230-3-60 Models MA Heater Model Min.
819288-UIM-A-0212 Unitary Products Group 13 All MA series air handler unit s are UL Listed up to 0.50" w .c. external static pressure, including air filte r , wet coil, and la rgest KW size heater .
819288-UIM-A-0212 14 Unitary Products Group All MA series air handler unit s are UL Listed up to 0.50" w .c. external static pressure, including air filte r , wet coil, and la rgest KW size heater .
819288-UIM-A-0212 Unitary Products Group 15 * Optional dehumidificat ion hu midistat switch contacts open on humidity rise. Notes: 1. “Y” T erminal on Air Handler Control Board must be connected for full CFM and applications req uirin g 60 second blower of f del ay for SEER enhancement.
Subject to change without not ice. Published in U.S.A. 819288-UIM-A-0212 Copyright © 2012 by Johnson Controls, Inc. All rights reserved. Supersedes: 262675-UIM-F-1010 Johnson Contro ls Unit ary Produ.
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