17
Marvair Classic AVPA/HVPA/HVPSA Heat Pump I&O Manual
11/2017 Rev. 7
5.
Airflow Requirements:
Note the minimum CFM requirements (section 2.4). Keep duct lengths as short as possible. Do not
obstruct airflow through the unit.
Applications using duct work should be designed and installed in accordance with all applicable safety
codes and standards. Marvair
®
strongly recommends referring to the current edition of the National
Fire Protection Association Standards 90A and 90B before designing and installing duct work. The
duct system must be engineered to insure sufficient air flow through the unit to prevent over-heating of
the heater element. This includes proper supply duct sizing, sufficient quantity of supply registers, and
adequate return and filter areas. Duct work must be of correct material and must be properly insulated.
Duct work must be constructed of galvanized steel with a minimum thickness of .019". Duct work
must be firmly attached, secured, and sealed to prevent air leakage. See section 2.4 for additional duct
work requirements.
6.
Clearances:
When facing the unit from the outside, the minimum clearances are found below. Note the minimum
clearances required for proper operation and service (Tables 4a & 4b below).
MODEL
Min. Clearance
From the Front
Min. Clearance
Around Sides
(Single Unit)
Min. Clearance
Between Sides
(Two Units)
Min. Space
Above Unit
24
42 inches
30 inches
18 inches
24 inches
30/36
42 inches
30 inches
18 inches
24 inches
42/48/60
42 inches
30 inches
30 inches
24 inches
Table 4a - AVPA Minimum Clearances
MODEL
Min. Clearance
From the Front
Min. Clearance
Around Sides
(Single Unit)
Min. Clearance
Between Sides
(Two Units)
Min. Space
Above Unit
24
42 inches
30 inches
18 inches
24 inches
30/36
42 inches
30 inches
30 inches
24 inches
42/49/60
42 inches
30 inches
30 inches
12 inches
Table 4b - HVPA Minimum Clearances
7.
Codes:
Make sure your installation conforms to all applicable electrical, plumbing, building, and municipal
codes. Some codes may limit installation to single story structures.
8.
Electrical Supply:
The power supply must have the appropriate voltage, phase, and ampacity for the model selected.
Voltage must be maintained above minimum specified values listed below. Refer to the unit data plate
for ampacity requirements.
Electrical Rating Designations*
A
C
D
Nominal Voltage
208/230
208/230
460
Phase
1
3
3
Minimum Voltage
197
197
414
Maximum Voltage
253
253
506
* Letters refer to model number code designations. Refer to page 5.
Table 5 - Voltage Limitations
