Airxcel 48000 Series Specifications download pdf (Page 4)

SUPPLY DUCTING AND REGISTERS

A. Ducting

1. The field fabricated supply ducting must attach to

both sides of the ceiling plenum. A minimum of two

ducts are required, with one duct attached to each

side of the plenum (See Figure 1).

2. Each duct must have a minimum height of 1 1/2",

maximum height cannot exceed 4 inches. Total free

area inside each duct must be no less than 10 square

inches.

NOTE

To decrease restriction and increase air flow, the

ducting should make as few bends and turns as

possible. When corners or turns are required, we

recommend that you radius the corners to keep air

flow at a maximum.

Ten (10) square inches of free area per duct is the

minimum requirement, larger ducting will improve

air flow and system performance.

3. Where ducting secures to the ceiling plenum,

maximum width is 8 inches.

4. All field fabricated cold air supply ducting must be

insulated and must have a vapor barrier.

IMPORTANT

Insulation reduces cooling loss and helps prevent

water staining of the vehicle ceiling due to

moisture condensation.

B. Registers

Supply (cold air) registers should have a minimum

discharge area of 48 square inches per system, or 24

square inches per duct. A minimum of 6 is

recommended.

Plenum

Terminal

Designation

Thermostat

Wire

Connection

Function Of Low Voltage Terminal

Extending From Ceiling Plenum

B BLUE

Completes -

12 VDC circuit for all relays

Y YELLOW Energizes coil on Compressor Relay

GREEN Energizes coil on High Fan Relay

GRAY

Energizes coil on Low Fan Relay

WHITE Energizes coil on Heat Relay

“Heat Ready”

Boxes

“Cool Only”

Boxes

FREEZE

WHITE Evaporator Freeze Sensor Connections

1 2 3 4 5 6 7 8 9 10

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Airxcel 48000 Series Specifications Page 4

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