York MA - Manuals - manualsarea.com

Page 2 - SECTION III: UNIT INSTALLATION; CLEARANCES

262675-UIM-A-0806 2 Unitary Products Group 1. Install this air handler only in a location and position as specified inSECTION III of these instructions. 2. Always install the air handler to operate within the air handler’sintended maximum outlet air temperature. Only connect the airhandler to a duct...

Page 3 - AIR HANDLER AND COIL DOWNFLOW; NOTE: Tie plate and screws are provided with coils.; FIGURE 2: Coil and Air Handler Attachment Details

262675-UIM-A-0806 Unitary Products Group 3 DOWNFLOW AND HORIZONTAL CONVERSION These air handler units are supplied ready 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 forunit positioning info...

Page 4 - Air filters and filter racks must be field supplied.; SUSPENSION KITS; Equipment should never be operated without filters.

262675-UIM-A-0806 4 Unitary Products Group DUCT CONNECTORS Air supply and return may be handled in one of several ways bestsuited to the installation. See Figure 3 for dimensions for duct inlet andoutlet connections. The vast majority of problems encountered with combination heatingand cooling syste...

Page 5 - SECTION IV: ELECTRIC HEATER; Units; FIGURE 4: Typical Horizontal Installation

262675-UIM-A-0806 Unitary Products Group 5 HORIZONTAL SUSPENSION For suspension of these units in horizontal applications, it is recom-mended to use angle steel support brackets with threaded rods, sup-porting the units from the bottom, at the locations shown in Figure 4. SECTION IV: ELECTRIC HEATER...

Page 6 - SECTION VI: REQUIRED CONTROL; FUNCTIONALITY AND OPERATION; Jumper Positions

262675-UIM-A-0806 6 Unitary Products Group NOTE: All wiring must comply with local and national electrical coderequirements. Read and heed all unit caution labels. NOTE: It is possible to vary the amount of electric heat turned on duringthe defrost cycle of a heat pump. Standard wiring will only bri...

Page 7 - Unitary Products Group; External Relay Outputs; SECTION VII: LINE POWER

262675-UIM-A-0806 Unitary Products Group 7 External Relay Outputs The control includes three outputs to drive external relays having 24VAC coils. The outputs have a maximum rating of 1.0 Amp pilot duty at24 VAC. HUM OUT The HUM OUT output can be used to drive an external relay or solenoid(24 VAC coi...

Page 8 - SECTION VIII: BLOWER SPEED; FIGURE 6: Line Power Connections; USE ONLY COPPER CONDUCTORS; FIGURE 7: 460V - Line Power Connections; CAP

262675-UIM-A-0806 8 Unitary Products Group SECTION VIII: BLOWER SPEED CONNECTIONS All air handlers contain 3-speed blower motors which are prewired tothe control board. Adjust blower motor speed to provide airflow within the minimum andmaximum limits approved for evaporator coil, electric heat and o...

Page 9 - SECTION IX: UNIT DATA

262675-UIM-A-0806 Unitary Products Group 9 SECTION IX: UNIT DATA TABLE 7: Physical and Electrical Data Models: MA 08B21 12B21 12B41 14D21 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 Voltage 208 / 230 208 / 230 460 208 / ...

Page 15 - SECTION X: MAINTENANCE; LUBRICATION; The bearings of the blower motor are permanently lubricated.; FIGURE 10: Cooling Models with Electric Heat Wiring; MA SERIES - Air Handler Control Wiring; CONTROL WIRING - MA Series - Air Handler & New UPG HP Systems; Two Stage H/P with York Guard VI Board & Copeland “Ultra Tech”

262675-UIM-A-0806 Unitary Products Group 15 1. “Y” Terminal on Air Handler Control Board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.2. Optional humidity switch - contacts open on humidity rise.3. Remove HUM STAT Jumper on AH Control Boar...

Page 16 - Copyright; NOTES

Subject to change without notice. Printed in U.S.A. 262675-UIM-A-0806 Copyright © by York International Corp. 2006. All rights reserved. Supersedes: 170341-UIM-C-0806 Unitary 5005 Norman Product York OK Group Drive 73069 NOTES