Installation manual
SeaMach 24 VDC
Rooftop Air Conditioners
SeaMach 24 VDC Rooftop Air Conditioner Installation Manual 5/2013 Page 20 of 20
1976A520 (10-11) PP
Chapter 11 - Maintenance
One of the biggest advantages to your air conditioner is that the maintenance needed to keep the unit in
good care is minimal. As the owner, your primary responsibility is the cleaning and replacement of the
lter(s). Filters are made from long life natural bers which can be cleaned and reused.
If the lters are not cleaned at regular intervals, they may become partially clogged with lint, dirt, grease,
etc. A clogged lter will produce a loss of air volume and may eventually cause an icing-up of the cooling
(evaporator) coil. The lters should be cleaned or changed at least every two weeks when the air conditioner
is in operation.
Cleaning and/or changing the lters:
Disengage the two 1/4-turn fasteners that secure the ceiling assembly grille to the ceiling assembly 1.
(See Figure 7).
Lower the grille and lter(s) from the ceiling assembly.2.
Take lter(s) out and either clean or exchange with other lters (See Figure 7).3.
If the vehicle is equipped with a ush mount ceiling assembly, remove the four return air grill 4.
screws.
Remove lter from grill and either clean or exchange with new lter. 5.
NOTE: If replacement lters are necessary, they can be purchased from most Authorized Service
Centers. It is recommended that spare lters be carried with the unit at all times to replace worn,
torn or deteriorated lters.
Service Person:
Electrical -A. All electrical work and/or inspection should be performed only by qualied service
personnel. Contact your nearest Service Center if electrical problems should arise.
Check Points -B. Failure to start or to cool the air are sometimes problems with air conditioning
units. The air conditioner is designed to operate on 24 VDC electrical power. If the compressor on
the air conditioner fails to start, check with your Service Center to determine that the proper wire
size is connected to the unit, the proper circuit breakers are installed as protection devices on the
electrical circuit. Refer to the chart on page 9 to determine if the proper size wire is being used.
Each air conditioning unit must be protected with a 50 amp time delay fuse or circuit breaker.
If the air conditioner continues to trip off the circuit breakers, have an electrician check the starting
amperage and running amperage on the unit. If the circuit breaker continues to trip off and the electrical
consumption is found to be normal, it will require the replacement of the faulty circuit breaker. If all
electrical power to the air conditioner is normal but neither the fan nor the compressor will operate,
the connector plug located behind the ceiling assembly control box should be checked to determine
whether it is faulty.
Mechanical Integrity -C. The air conditioner should be inspected periodically to be sure that the bolts
which secure the unit to the roof are tight and in good shape. Also, an examination of the plastic
shroud covering the air conditioner on the top of the roof should be made periodically. Be sure the four
mounting screws and washers are snug and holding the shroud to the air conditioner. Also examine the
shroud to be sure it is not developing cracks or has suffered damage from impact.
Airxcel, Inc.
Marvair Division
156 Seedling Dr.
Cordele, GA 31015