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NOTE: Proper safety equipment and proper refrigeration tools are required when working with R-410A
refrigerant. Check unit serial tag for correct refrigerant type before topping-off or recharging a system.
NOTE: Refrigerant R-410A uses a POE (polyolester) lubricant. The refrigerant must be introduced and
charged from the cylinder only as a liquid.
NOTE: When installing field piping, you must take care to protect all refrigerant lines from the
atmosphere especially when using refrigerants with POE oils. Do not allow the piping to stand open to
air for more than 15 minutes. Units designed for R-410A have a compressor that contains POE oil,
which quickly absorbs water from the air. The longer that the refrigerant piping is left open to air, the
harder it will be to fully evacuate the system. If left open too long, the POE oil may require replacement
to achieve the required vacuum level.
•
Refer to
piping sizes based on equivalent pipe lengths.
•
Refer to the condensing unit's Installer/User Guide for the complete charging procedure of the
system.
4.2 Refrigerant-line Sizes and Equivalent Lengths
The following tables list the information required to field-install the refrigerant piping for the system.
Table 4.3 Recommended refrigerant line sizes, O.D. cu by equivalent length
System Models
MT036E/PFD037A-*L or PFD037A-*H
MT048HE/PFD054A-*L
MT060HE/PFD067A-*L
MT060HE/PFDZ67A-*L or PFD067A-*H
Consult factory for proper line sizing for runs longer than maximum equivalent length shown.
1. Use one line size smaller on suction lines for vertical risers.
4.2.1 Refrigerant Charge Requirements
To calculate the charge requirements:
1.
Determine the charge for your units by model number from the following tables.
2. Determine the charge for the piping by line size and length.
3. Add these all together to obtain the total refrigerant charge for your system.
Table 4.4 Indoor Evaporator Approximate R-410A refrigerant charge
4 Piping and Refrigerant Requirements
Refrigerant-line Sizes and Equivalent Lengths
Suction line, in.
Liquid line, in.
Suction line, in.
Liquid line, in.
Suction line, in.
Liquid line, in.
Suction line, in.
Liquid line, in.
Model #
MT036HE
MT048HE
MT060HE
below,for recommended refrigerant
Equivalent Length, ft (m)
50 (15)
75 (23)
100 (30)
7/8
7/8
7/8
1/2
1/2
1/2
1
7/8
1-1/8
1-1/8
1/2
1/2
5/8
1-1/8
1-1/8
1-1/8
1/2
5/8
5/8
1-1/8
1-1/8
1-1/8
1/2
5/8
5/8
Charge, lb (kg)
1 (0.45)
2.2 (1.0)
2.2 (1.0)
125 (38)
150 (45)
7/8
7/8
1/2
1/2
1
1
1
1-1/8
1-1/8
5/8
5/8
1-1/8
1-1/8
5/8
5/8
1-1/8
1-1/8
5/8
5/8
17
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