Ductwork

Ductwork should be designed and sized according to the methods in Manual Q of the Air Conditioning Contractors of America (ACCA).

A closed return duct system shall be used. This shall not preclude use of economizers or outdoor fresh air intake. It is recommended that supply and return duct connections at the unit be made with flexible joints.

The supply and return air duct systems should be designed for the CFM and static requirements of the job. They should not be sized by matching the dimensions of the duct connections on the unit.

Outdoor ductwork must be insulated and waterproofed.

Equipment is shipped for side ductwork connection. The unit can be converted to bottom ductwork connection by removing the duct covers located over the bottom duct openings and placing these covers over the side duct openings (see Figure 4).

To remove the bottom duct cover over supply opening:

1.Remove screw on cover nearest side opening.

2.Lift end of cover slightly and push to slide back screw/ pin free from duct flange.

3.Slide duct cover out the side duct opening.

Removing Bottom Duct Covers

2

1

1. Remove screw and lift.

Base

2.Slide cover to free back pin.

Figure 4

CAUTION

When fastening ductwork to side duct flanges on unit, insert screws through duct flanges only; do not insert screws through casing. If using bottom duct work, do not use screws to secure ductwork to bottom duct opening under drain pan side. Using screws to secure bottom duct may damage drain pan.

Filters

Air filters are to be used with this heating/cooling unit. Filters are not factory supplied in the unit. However, a filter frame accessory is available from the manufacturer that allows filters to be installed within the unit. If the filter frame accessory is not used, a filter must be installed in the duct work by the installer. Filters must always be installed ahead of the evaporator coil and must be kept clean or replaced. Dirty filters will reduce the airflow of the unit. Filters should be sized in accordance with Table 2.

Minimum Required Surface Area

for Disposable Filters

Nominal Cooling

Filter Area

(sq. ft.)

 

 

 

24,000

2.67

 

 

30,000

3.33

36,000

4.00

 

 

42,000

4.67

48,000

5.33

 

 

60,000

6.67

 

 

Table 2

Electrical Wiring

WARNING

Line voltage is present at all components when unit is not in operation on units with single pole contactors. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies. Failure to disconnect all power supplies could result in personal injury or death.

All wiring should be done in accordance with the National Electrical Code, ANSI/NFPA No. 70 (latest edition); Canadian Electrical Code Part 1, CSA C22.1 (latest edition); or local codes where they prevail. Use wiring with a temperature limitation of 75°C minimum. Run the electric power supply through a fused disconnect switch to the connection box of the unit and connect as shown in the wiring diagram located on the inside of the control access panel.

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Allied Air Enterprises (2, 4)PHP(13, 15) Removing Bottom Duct Covers, Minimum Required Surface Area For Disposable Filters
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15), (2, 4)PHP(13 specifications

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