Quick Reference Guide
High-Efficiency Horizontal Discharge Modulating Air Conditioner
HMCG2 ACC STD ECM High-Efficiency Horizontal Discharge Modulating Air Conditioner
Interfacing the indoor unit with the outdoor unit
Note: A contractor supplied filter/drier must be field-installed at the indoor coil.
Low-voltage wiring
Figure 1: Wiring diagram – HMCG2 ACC STD ECM
Figure 2: Wiring Diagram – HMCG2 ACC VS ECM
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. 
Figure 3: Minimum clearance
NOTICE
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
Figure 4: Connection and access points
Note: Refer to the Tabular Data Sheet provided with the unit for detailed unit dimensions. 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 atmosphere 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 rupture. A rupture can propel hot solder and oil causing injury to the technician attempting to braze the line. 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 | WB cool | |
| Minimum | 50 (10)* | 57 (14) |
| Maximum | 122 (50)* | 72 (22) |
Note: *Refer to the notice in the Reduced capacity conditions section in the Installation Manual.
Standard refrigeration piping
The maximum allowable equivalent line length for this product is 131 ft for 2 ton and 3 ton and 164 ft for 4 ton and 5 ton. 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 refrigeration piping
| Model | Maximum pipe length ft (m) | Maximum height difference ft (m) | Additional refrigerant exceeding 25 ft (7.62 m) oz/ft (g/m) |
| HMCG22B241S | 131 (40) | 65.5 (20) | 0.38 (11) |
| HMCG22B361S | 131 (40) | 65.5 (20) | 0.38 (11) |
| HMCG22B481S | 164 (50) | 98 (30) | 0.38 (11) |
| HMCG22B601S | 164 (50) | 98 (30) | 0.38 (11) |
Refrigeration piping
Keep the connecting pipe as short as possible to ensure optimum performance.
Table 3: Piping requirements
| Model | Outdoor diameter of pipe – in. (mm) | |
| Gas | Liquid | |
| HMCG22B241S | 5/8 (15.88) | 3/8 (9.52) |
| HMCG22B361S | 5/8 (15.88) | 3/8 (9.52) |
| HMCG22B481S | 7/8 (19.05) | 3/8 (9.52) |
| HMCG22B601S | 7/8 (19.05) | 3/8 (9.52) |
Electrical connection
Figure 5: Electrical connection for HMCG22B24 and HMCG22B36 models 
Figure 6: Electrical connection for HMCG22B48 and HMCG22B60 models
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 pre-charged 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. Refer to the Installation Manual and the Service Data Application Guide for instructions on manual operation.
Subject to change without notice. Published in U.S.A.
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6255355-URG-A-0722
Supersedes: Nothing
York International Corp.
5005 York Drive
Norman, OK 73069
Documents / Resources
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