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BLD2024-0422_Manufacturer_Specifications_and_Installation_Instructions_3.27.2024_9.43.28_AM_4159653Interfacing the indoor unit with the outdoor unit IMPORTANT: Use a kit to interface the indoor unit with the outdoor unit. Order HMH7AK001 for the required hardware and follow the instructions provided. Low -voltage wiring HEAT PUMP THERMOSTAT HEAT PUMP B ______ REVERSING VALVE_____ B INSTALLATION KIT W2 BRN -- 51 RED W1' -- ----------------- - W BLU Y YEL --'-'-'-'-'- - y YEL C-U -- - ----------- - - - C R RED -- - _--- _ q FAN RELAY __ - SPDT s 24v JJ Y Y K 6 BLK 5 q BLU 5 O RLK/WHT L BLOWER RED/ G MOTOR 2 RED/WHT WHT N t BLK/WHT 208V 3 J 240V COM m z 8 � � 2 N w � 24V � m XFORMER BLU 6061517-UWD-A-0121 Figure 1: Wiring diagram - HMH7 ACC STD ECM Figure 2: Wiring Diagram - HMH7 ACC VS ECM Note: Use the B terminal on the thermostat for the reversing valve connection (energized in heat mode). The room thermostat must control fossil fuel operation if matched with a gas furnace. A CAUTION This equipment uses an inverter drive that stores hazardous energy up to 5 min after power is removed. Wait for more than 5 min before performing electrical work after power is removed. Clearance During installation, maintain the required clearance from walls and adjacent equipment. See Figure 3. When installing multiple units, be careful to avoid intake of discharged air from adjacent units. 24K/36K: Over 12 in. (300 mm) 48K/60K: Over 24 in. (600 mm O�e�6,h (7 � �1 s0�J O �1 ,e� V O Figure 3: Minimum clearance (3S0 11436-001 It is imperative to fasten this equipment to a sturdy base for protection against vibration, strong breeze, or earthquake. Use anchors and a base adequate to protect the unit against tipping or dislocation. Connection and access points Fan guard (removable High -voltage connection Low -voltage connection Mounting points/ 1 (4 points) Service valve connections Figure 4: Connection and access points ���Ilgll;l� A1439-001 Note: Refer to the Tabular Data Sheet provided with the unit for detailed unit dimensions. Table 3: Piping requirements A CAUTION The indoor coil is under inert gas pressure. Relieve pressure from the coil by depressing the Schrader core at the end of the suction manifold stub out. Dry nitrogen must always be supplied through the tubing while it is being brazed, because the temperature required is high enough to cause oxidation of the copper unless an inert atmo- sphere is provided. The flow of dry nitrogen must continue until the joint has cooled. Always use a pressure regulator and safety valve to ensure that only low pressure dry nitrogen is introduced into the tubing. Only a small flow is necessary to displace air and prevent oxidation. If a refrigerant leak is discovered after the system is charged, the system must be evacuated to repair the leak. Attempting to braze a line under refrigerant pressure can cause the line to rup- ture. A rupture can propel hot solder and oil causing injury to the technician attempting to braze the line. A CAUTION Avoid personal injury and/or equipment damage. Carefully follow the brazing, charging, and other instructions in the Installation Manual provided with the unit. Operating limit conditions Table 1: Minimum and maximum operating limit conditions Air temperature Outdoor coil °F (°C) Indoor coil °F (°C) DB cool DB heat WB cool DB heat Minimum 35 (2)* -5 (-21) 57 (14) 50 (10) Maximum 125 (52)' 75 (24) 72 (22) 80 (27) Note: *Refer to the notice in the Reduced capacity conditions section In the Installation Manual. Standard lineset The maximum allowable equivalent line length for this product is 80 ft. The maximum allowable vertical lineset varies depending on the vertical separation between the indoor and outdoor section. See Table 2 for allowable lineset lengths and sizing. Table 2: Allowable vertical linesets Model Maximum pipe length ft (m) Maximum height difference ft (m) Additional refrigerant - exceeding 15 ft (4.6 m) oz/ft (g/m) HMH72B24 164 (50) 98 (30) 0.38 (11) HMH72B36 246 (75) 98 (30) 0.38 (11) HMH72B48, HMH72660 246 (75) 98 (30) 0.60 (17) Refrigerant piping Keep the connecting pipe as short as possible to ensure optimum performance. Subject to change without notice. Published in U.S.A. Copyright © 2021 by Johnson Controls. All rights reserved. Model Outdoor diameter of pipe - in. (mm) Gas Liquid HMH72B24 5/8 (15.88) 3/8 (9.52) HMH72B36 3/4 (19.05) 3/8 (9.52) HMH72B48, HMH72B60 7/8 (22.22) 3/8 (9.52) Electrical connection Lock nut (field -supplied) Conduit plate Conduit connector (field supplied) Figure 5: Electrical connection for HMH72B24 and HMH72B36 models Right side plate Low -voltage cable Power supply nut (quantity: 2) supply dtage cable --d controller) A1438-001 L �L Conduit connector for low -voltage cable ' RAint n n Valve Maintenance plate cover Conduit connector for power supply Figure 6: Electrical connection for HMH72B48 and HMH72B60 models a eace plate cover A1437-001 Unit charging and startup It is important to be aware of the following: • Correct charging of the equipment is essential for correct operation. • The unit is precharged with refrigerant. Add refrigerant as appropriate for the length of the lineset. Refer to the Tabular Data Sheet for more information. • You cannot use subcool or superheat methods to charge the unit. Recover and weigh in if you have any concerns about the unit charge. • Perform start-up and verify operation in cooling mode and heating mode. Refer to the Instal- lation Manual and the Service Data Application Guide for instructions on manual operation. 6046974-URG-A-0121 Supersedes: Nothing York International Corp. 5005 York Drive Norman, OK 73069