WaterFurnace Envision NHAC026, Руководство по установке

Страница: 8 / 16

7
ENVISION AIR COILS INSTALLATION MANUAL
General Installation Information cont.
Encased Coil Cabinet Configuration
The Envision encased coil cabinet is factory configured for
upflow and horizontal left hand air discharge installation
(Figure 1). For bottomflow or horizontal right hand
discharge, certain field modifications are required.
WARNING: Do not lift or reposition the ‘A’ coil by
grasping the copper tube header or distributor.
This could cause a tubing fracture resulting in a
refrigerant leak.
Bottomflow Application
To convert the NRA/NHA encased coil cabinets for
bottomflow applications follow the steps shown below:
Bottom air discharge units require the supply air opening 1.
to be cut at least a 1/2” larger than the unit’s air outlet.
When installed on combustible flooring, protect the
2.
edges of the floor opening with sheet metal over wrap or
other non-combustible material.
Bottom air discharge units should be sealed well to the
3.
floor to prevent air leakage.
Horizontal Right Air Discharge
Application
To convert the NRA/NHA encased coil cabinets for
horizontal right air discharge applications follow the steps
shown below
Remove all access panels. Remove the ‘A’ coil assembly 1.
and the horizontal drain pan.
From the vertical upflow position, rotate the top of the
2.
cabinet 90° to the right and set in place.
Remove the support bracket mounted to the top plate of
3.
the ‘A’ coil. Rotate the ‘A’ coil support bracket 180° from
its original position and re-attach into existing holes in
the top plate of the coil. This must be done to prevent
the ‘A’ coil from falling into the drain pan (Figure 3).
Move the horizontal drain pan from the left side of the ‘A’
4.
coil to the right hand side of the ‘A’ coil. Place the ‘A’ coil
and horizontal drain pan assembly into the cabinet
so that the support bracket is resting in the horizontal
drain pan as shown in Figure 3.
Remove the 2 drain plugs from the upper right of the
5.
access panel and install them on the lower left of the
access panel. Replace the access panels.
If the unit is suspended, the entire length of the cabinet
6.
should be supported.
IMPORTANT: When removing the coil, there
is possible danger of equipment damage and
personal injury. Be careful when removing the coil
assembly from the unit.
Figure 2 - Bottomflow NRA/NHA
Figure 3 - Horizontal Right Hand Air Discharge
Rotate the coil support bracket to this position
Figure 1 - Factory Configuration