Marvair HVPA49 Manuel d'utilisateur télécharger pdf (Page 7)

Classic Manual 9/2013 rev. 5

1.3 General Operation

Refrigerant Cycle

The Classic 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.

Models HVPSA have 2-stage compressors with first stage cooling capacity approximately 65% of

the total cooling capacity. The 2-stage compressor provides lower start-up amps and is able to match

more precisely the cooling capacity of the heat pump with the heat load in the building. The 2-stage

is only operational in the cooling mode. A two stage cooling thermostat is required for all 2-stage

compressors.

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 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.

Table 2b. Ship Weight (lbs) - Model HVPA & HVPSA

MODEL 24 30/36/42 49 60

Classic with "N" Ventilation

Conguration

375 560 610 625

Classic with "Y", "Z", "B", "J" & "C"

Ventilation Conguration

405 590 625 640

Table 3. Filter Size (inches)

MODEL FILTER TYPE INCHES MILLIMETERS

PART

NUMBER

FILTERS PER

UNIT

MERV

RATING

AVPA24 Return Air Filter 25 x 16 x 1 635 x 406 x 25 80135 1 7

AVPA30/36 & HVPA24 Return Air Filter 30 x 16 x 1 762 x 406 x 25 80136 1 7

AVPA42/48/60,

HVPA30/36/42 &

HVPSA36/42

Return Air Filter 36½ x 22 x 1 927 x 559 x 25 80139 1 7

HVPA49/60 &

HVPSA49/60

Return Air Filter 18 x 24 x 1 457 x 610 x 25 81199 2 7

Intake Air Filter* 14 x 14 x 1 356 x 356 x 25 80192 1 N/A

AVPA24/30/36

& HVPA24 with

GreenWheel ERV

Return Air Filter 27½ x 13½ x 1 699 x 343 x 25 80769 1 7

Intake Air Filter* 14 x 14 x 1 356 x 356 x 25 80192 1 N/A

AVPA42/48/60,

HVPA30/36/42 &

HVPSA36/42 with

GreenWheel ERV

Return Air Filter 36½ x 22 x 1 927 x 559 x 25 80139 1 7

Intake Air Filter* 14 x 14 x 1 356 x 356 x 25 80192 1 N/A

*Units with the GreenWheel ERV

1 2 3 4 5 6 7 8 9 10 11 12 ... 45 46

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Marvair HVPA49 Manuel d'utilisateur Page 7

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