7
Marvair Wall Mount Heat Pump I&O Manual
06/2023 Rev.7
Model
Weight
Base
w/Economizer
w/3 Phase
w/Economizer & 3 Phase
MAA1020H/MAA1024H/MAA2024H
Lbs (Kg)
337 (153)
357 (162)
356 (161)
376 (171)
MAA1030H/MAA1036H/MAA2030H/MAA2036H
Lbs (Kg)
397 (180)
419 (190)
416 (189)
438 (199)
MAA1042H/MAA1048H/MAA2042H/MAA2048H
Lbs (Kg)
453 (205)
476 (216)
491 (223)
514 (233)
MAA1060H/MAA2060H
Lbs (Kg)
469 (213)
492 (223)
522 (237)
545 (247)
MGA1072H
Lbs (Kg)
576 (261)
599 (272)
629 (285)
652 (296
Table 2. Installed Weight (lbs (Kg)
Model
FILTER TYPE
INCHES
MILLIMETERS
PART
NUMBER
FILTERS
PER UNIT
MERV
RATING
MAA1020H/MAA1024H/MAA2024H
Return Air Filter 30 x 16 x 2 762 x 406 x 51
80138
1
8
MAA1030H/MAA1036H/MAA2030H/MAA2036H
Return Air Filter 36½ x 22 x 2 927 x 559 x 51
80162
1
8
MAA1042H/MAA1048H/MAA2042H/MAA2048H
Return Air Filter 36½ x 22 x 2 927 x 559 x 51
80162
1
8
MAA1060H/MAA2060H
Return Air Filter 18 x 24 x 1
457 x 610 x 25
81199
2
8
MGA1072H
Return Air Filter 18 x 24 x 2
457 x 610 x 51
81257
2
8
Table 3. Filter Size (inches)
Model
MAA1020H MAA1024H
MAA1030H
MAA1036H
MAA1042H
MAA1048H
MAA1060H
MGA1072H
A
A
C
D
A
C
D
A
C
D
A
C
D
A
C
D
A
C
D
C
D
Charge Amount
100
110
114
130
185
185
185
210
Model
MAA2024H
MAA2030H
MAA2036H
MAA2042H
MAA2048H
MAA2060H
A
C
D
A
C
D
A
C
D
A
C
D
A
C
D
A
C
D
Charge Amount
120
120
150
185
185
220
Table 4. Refrigerant Charge (R410A, Ounces)
Basic Model
Special Option
TEMPERATURE RANGES
Non-Economizer
Base Unit
*20ºF - 131ºF (-7ºC - 55ºC)
Desert Duty
*20ºF - 131ºF (-7ºC - 55ºC)
Extreme Duty
*0ºF - 131ºF (-18ºC - 55ºC)
Economizer-Equipped
Base Unit
-40ºF - 131ºF (-29ºC - 55ºC)
Desert Duty
-40ºF - 131ºF (-29ºC - 55ºC)
Extreme Duty
-40ºF - 131ºF (-29ºC - 55ºC)
**An Optional FCC switch is required for the cooling Mode. Heating mode ratings are @47°F Outdoor Temperature. Performance loss
realized below this rating point.
Table 5. Ambient Temperature Operating Ranges
1.5 General Operation
Refrigerant Cycle
Marvair heat pumps use R-410A refrigerant in a conventional vapor-compression refrigeration cycle to
transfer heat. In the cooling mode, a double blower assembly blows indoor air across the evaporator (indoor
coil). Liquid refrigerant passing through the evaporator is boiled into gas by heat removed from the air.
The warmed refrigerant gas enters the compressor where its temperature and pressure are increased. The
hot refrigerant gas condenses to liquid as heat is transferred to outdoor air blown across the condenser
(outdoor coil) by the condenser fan. Liquid refrigerant is metered into the evaporator through a metering
device to repeat the cycle. In the heating mode, the process is reversed.
Heating Mode
During heating mode a special reversing valve reverses the flow of refrigerant through the system
exchanging the roles of the condenser and evaporator. Now the outdoor coil becomes the evaporator and
the indoor coil becomes the condenser. The refrigerant then flows through the outdoor coil, picks up heat
and becomes vaporized. The vapor then enters the compressor where it is compressed to a higher pressure
and temperature. Next it is pumped to the indoor coil where the heat will be released into the room. The
compressed refrigerant vapor will condense to its liquid state as it gives up heat. Finally, liquid flows
through a metering device into the evaporator where the cycle will be repeated.
Optional electric strip heat is available for all models. Please see Appendix A for instructions on field
installation of electric heat.
