Nortek P8SD-X36C, Installation Instructions Manual

7

rooftop

Rooftop installations must be located according to local 

building codes or ordinances and these requirements:

•  The roof must be capable of handling the weight of the 

unit. For unit weights, see 

Table 6 (page 13)

. Reinforce 

the roof if necessary.

•  The appropriate accessory roof curb (

Figure 4

) must be 

installed prior to unit installation. The roof curb must be 

square and level to ensure proper condensate drainage. 

Please follow all instructions provided with the kit

.

•  Secure  roof  curb  or  frame  to  roof  using  acceptable

mechanical methods per local codes. 

note:

Make sure 

the two supports beneath the unit have been removed. 

Roof

Curb

Figure 4. roof top installation

2”

Figure 3. ground level installation

Securing

Screws

Figure 5. internal Filter rack location

Horizontal to downflow conversion

The unit is shipped ready for horizontal duct connections. 

If down flow ducts are required, the unit must be converted 

following the steps below for the supply and return ducts.

1. Locate the duct cap inside the duct openings and remove 

the screw holding it in place.

2  Lift the cap out of the unit. (Hint: The cap can be pushed 

up from the bottom by reaching through the fork slot).

3. Cover the horizontal duct opening with the horizontal duct 

cap. The insulation will be on the indoor side.

4. Fasten the cover with screws to seal.

removal of internal Filter rack

1. Remove the return air panel from the unit.

2. Remove the height adjustment screw from the inside of 

the rack.

3. Remove (1) screw securing the assembly to the coil located 

on the left leg of the rack. 

note:

 The assembly can now 

be easily collapsed and removed from the unit. See 

Figure 

5

 for filter rack securing screw locations.

installing Filters in the Filter rack

1. Remove access panel screws from return air panel. (

Hint:

Loosen the unit’s top panel screws near the top edge of 

the access panel. The access panel was designed to be 

captured underneath the top panel.)

2. Slide the first filter between both guide channels of filter 

rack and allow the filter to drop easily into place.

3. Verify the bottom of the filter is within the channels of the 

rack.

4. Slide the 2nd filter between both guide channels of filter 

rack.

5. Verify the bottom of the filter is within the channels of the 

rack.

6. Replace access cover by sliding the top edge of panel 

under the lip of the unit’s Top Panel. Secure access panel 

by replacing the screws.

removing Filters from Filter rack

1. Remove access panel screws from return air panel. (Hint: 

Loosen the unit’s top panel screws near the top edge of 

the access panel. The access panel was designed to be 

captured underneath the top panel.)

2. Remove upper filter by gently pulling filter through the 

access panel opening.

3. Remove lower filter by lifting media to top of filter rack. 

Remove in the same manner as described in step 2.

4. Install new filter in the filter rack as described in the previous 

section.

condensate drain

Condensate is removed from the unit through the 3/4” female 

pipe fitting located on the front side of the unit. Install a 2 inch 

condensate trap in the drain line of the same size and prime 

with water. When connecting rigid drain line, hold the female 

fitting with a wrench to prevent twisting. 

do not over tighten!

Refer to local codes and restrictions for proper condensate 
disposal requirements. See 

Figure 6 (page 8)

.