Mr. Slim MXZ Series Guide Specification ©July 2011 Mitsubishi Electric / HVAC 5/51
Model Cooling Heating
MXZ-8B48NA 54 dB(A) 55 dB(A)
C. Coil:
1. The outdoor unit coil shall be of nonferrous construction with lanced or corrugated
plate fins on copper tubing.
2. The coil shall be protected with an integral guard.
3. Refrigerant flow from the outdoor unit to the indoor units shall be independently
controlled by means of individual electronic linear expansion valves for each indoor
unit.
4. Outdoor unit shall be pre-charged with sufficient R-410a refrigerant for up to one
hundred and thirty-one (131) feet of refrigerant piping.
5. All refrigerant lines between outdoor and indoor units shall be of annealed,
refrigeration grade copper tubing, ARC Type, meeting ASTM B280 requirements,
individually insulated in twin-tube, flexible, closed-cell, CFC-free (ozone depletion
potential of zero), elastomeric material for the insulation of refrigerant pipes and
tubes with thermal conductivity equal to or better than 0.27 BTU-inch/hour per Sq Ft
/ °F, a water vapor transmission equal to or better than 0.08 Perm-inch and superior
fire ratings such that insulation will not contribute significantly to fire and up to 1”
thick insulation shall have a Flame-Spread Index of less than 25 and a Smoke-
development Index of less than 50 as tested by ASTM E 84 and CAN / ULC S-102.
6. All refrigerant connections between outdoor and indoor units shall be flare type.
D. Compressor:
1. The compressor shall be a high performance, hermetic, inverter driven, variable
speed, dual rotary type manufactured by Mitsubishi Electric Corporation.
2. The compressor motor shall be direct current (DC) type equipped with a factory
supplied and installed inverter drive package.
3. The outdoor unit shall be equipped with a suction side refrigerant accumulator.
4. The compressor will be equipped with an internal thermal overload.
5. The compressor shall be mounted to avoid the transmission of vibration.
E. Branch Boxes:
The outdoor unit shall have a 3/8” liquid line connection and a 5/8” gas line connection.
Pipe lines running from the outdoor unit shall connect to a 3-port, a 5-port branch box, or a
combination of both. The port connections on the branch boxes are as described in the
table below:
Branch Box Model Number PAC-AKA31BC PAC-AKA51BC
Outdoor Unit
to Branch Box
Liquid line 3/8” 3/8”
Gas line 5/8” 5/8”
Branch Box to
Indoor Unit
Port
Connections
A B C A B C D E
Liquid line ¼” 1/4” 1/4” 1/4” 1/4” 1/4” 1/4” 1/4”
Gas line 3/8” 3/8” 3/8” 3/8” 3/8” 3/8” 3/8” 1/2”
The outdoor unit must be connected to at least one branch box. It can also be connected to
two 3-port branch boxes, to one 3-port and one 5-port branch box, or to two 5-port branch
boxes (At least two ports have to be left unused in this case).
(32 pages)
(24 pages)
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