Installing The Electrical Box
EnviroComfort Installation Manual
10
L-2657 ENGLISH
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HE
E
LECTRICAL
B
OX
The electrical box must be mounted to a solid surface in a dry location and within 3.5 feet (1m) of the unit. It must also be within
15 feet (4.5m) of where the digital control will be installed. Use the 3 keyhole mounting slots in the back of the electric box to
attach it to a suitable mounting surface. Use screws appropriate for that mounting surface (not included).
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A
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G
RILLES
Install the supply-air grille as high as possible and the return-air grille as low and close to the air conditioning unit as possible to
ensure direct uninterrupted airflow to the evaporator. In no instance should the supply-air grille discharge be directed toward the
return-air grille, as this will cause the system to short cycle.
To install grilles:
1.
Supply-air grille
- A minimum clearance of 3" (77mm) plus the duct diameter size is required behind the grille to
attach the ducting (see earlier section,“Spacing Allowances & Unit Dimensions” on page 7 for more information). Cut
the properly sized hole for the supply-air grille:
•
Measure the height and width dimensions of the grille’s flange (see Figure 5, page 10). Add 1/8” (3mm) to each
measurement and make the cutout that size. The cutout should be as small as possible to create a tight fit. Do not
allow the cutout to exceed the distance to the grille’s mounting holes. Remember to measure twice, cut once!
•
Mount the grille into the cutout and secure with screws in the mounting holes.
2.
Return-air grille
- A minimum clearance of 4" (107mm) is required in front of the return-air grille, free from any
furniture or other obstructions. Cut the properly sized hole for the return-air grille:
•
Measure the height and width dimensions of the grille’s flange (see Figure 5, page 10). Add 1/8” (3mm) to each
measurement and make the cutout that size. The cutout should be as small as possible to create a tight fit. Do not
allow the cutout to exceed the distance to the grille’s mounting holes. Remember to measure twice, cut once!
•
Mount the grille into the cutout and secure with screws in the mounting holes.
If your kit is supplied with a filtered return-air grille, the filter attached to the unit’s evaporator
must be removed
. Two
filters are
not
better than one, as the reduced air flow will decrease performance and possibly freeze the evaporator
coil.
Figure 5: Side View of Grille
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D
UCTS
Good airflow is critical for the performance of the entire system, and airflow is highly dependent on the quality of the ducting
installation. Run the ducting as straight, smooth, and taut as possible, minimizing the number of 90-degree bends (two tight 90-
degree bends can reduce airflow by 25 percent).
To make proper ducting connections:
1.
Starting at either end (the air-discharge grille or the air conditioning unit), pull back the fiberglass insulation exposing
the inner mylar duct hose.
2.
Slide the inner mylar duct hose around the mount ring until it bottoms out.
NOTE
The return-air filter, mounted either to the return-air grille or the front of the evaporator, removes debris from the air
prior to the air being drawn across the evaporator coil and fins. Dust and lint can clog and reduce airflow across the
evaporator coil resulting in poor performance. See “MAINTENANCE” on page 17 for filter cleaning instructions.
Mount ring
for duct
Flange
Measurement point
Measurement point
Front of
grille
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