Classic HVPA & HVPSA M&S 8.09-1
15700 - 9
HVAC Equipment
3.1 ELECTRICAL
Classic heat pumps and air conditioners are built in a wide variety of configurations and op
-
tions. The illustrations of the control center and the electrical schematics shown here are typical,
but probably are not identical to your units. Please refer to the electrical schematic in each unit
for the specific con
struction of that unit.
model selected. Voltage must be maintained above minimum specified values listed
below. Refer to the unit data plate for ampacity requirements.
Table 1. Voltage Limitations
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.
4.1 MAINTENANCE
Marvair
®
strongly recommends that the heat pump be serviced a minimum of twice a
year – once prior to the heating season and once prior to the cooling season. At this
time the filters, evaporator coil, condenser coil, the cabinet, and condensate drains
should be serviced as described below. Also at this time, the heat pump should be
operated in the cooling and heating cycles as described in Chapter 3, Start-Up. In
addition to this seasonal check-out, the unit should be maintained as follows:
Air Filter
Replace the air filter whenever it is visibly dirty.
Indoor Coil
If the coil becomes clogged or dirty, it may be cleaned by careful vacuuming or with
a commercial evaporator cleaning spray. DO NOT use a solvent containing bleach,
acetone, or flammable substances. Turn power OFF before cleaning. Be careful
not to wet any of the electrical components. Be sure the unit has dried before
restarting.
Outdoor Coil
Periodically inspect the outdoor coil and the cabinet air reliefs for dirt or obstructions.
Remove foreign objects such as leaves, paper, etc.
If the coil is dirty, it may be washed off with a commercial solvent intended for
this purpose. TURN OFF POWER BEFORE CLEANING! Be sure that all electrical
components are thoroughly dry before restoring power.
Cabinet
The cabinet may be cleaned with a sponge and warm, soapy water or a mild
detergent. Do not use bleach, abrasive chemicals or harmful solvents.
