10
IMPORTANT NOTES TO INSTALLER
• When setting the roof curb for installation, routing and
securement of the gas heat exchanger condensate
drain line must be determined and installed prior to
setting the unit on the curb. It is recommended to drill
a 1.00”-1.25” diameter hole through the roof below
the rectangular opening located in outer close off curb
panel (G), approximately 15” in from the short side of
curb and 1”-2” in from the long side of curb. If drilling a
hole is not an option, routing the condensate drain hose
over to the duct passage opening with enough slope is
acceptable as long as drain line is secured to curb and
duct, ensuring no kinks or traps can form between the
collector box drain or interior of the building. Leave a
minimum of 24” drain line extending out the top of roof
curb front close off panel (G) for passage through unit
bottom and connection to unit drain when unit is being
set. See unit or condensate/vent drain kit (P/N-922485)
instructions for completion of the drain connection.
• It is recommended no non-serviceable connections are
introduced in the drain line between unit drain connection
and an accessible area within the building interior.
• Securement of the drain line to the inside surface of
the roof curb is acceptable and should be made in the
wood nailer area (top 3.5”) to avoid possible leaks or
penetrations to roofing materials.
• Cut and remove the insulation covering the 2” x 3”
condensate drain passage in outer panel (G) only. Before
installing inner panel (G) ensure there is enough slope
and there are no kinks or high spots that could trap
water in the line prior to entering the warmer interior of
the building where a drain trap is acceptable.
• All panels must be securely in place during rigging and
hoisting, except control access panel. See
for additional lifting and setting of unit requirements.
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 both the supply and return
ducts.
1. Remove both horizontal duct caps.
2. Locate the duct cap inside the duct openings and remove
the screw holding it in place.
3. Lift the cap out of the unit. (Hint: The cap can be pushed
up from the bottom by reaching through the fork slot).
4. Cover the horizontal duct openings with the horizontal
duct caps removed earlier in step 1. The insulation will
be on the indoor side.
5. Fasten the cover with screws to seal.
6. Remove and discard the two wood supports beneath
the unit.
Condensate Drain (Air Conditioning)
Air conditioning condensate is removed from the unit
through the 3/4” female pipe and supplied 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.
Table 1. External & Internal Filter Sizes
EXTERNAL FILTER SIZES
NOMINAL
COOLING
(TONNAGE)
FILTER SIZE
(IN. X IN.)
APPROXIMATE
AIR FLOW
RANGE (CFM)
APPROXIMATE
FILTER AREA
(SQ. IN.)*
2.0
20 x 25
600-900
450
2.5
20 x 30
750-1200
550
3.0
25 x 25
1100-1300
625
3.5
24 x 30
1200-1600
750
4.0
18 x 24 (2 required)
1400-1800
850
5.0
20 x 25 (2 required)
1700-2200
1000
INTERNAL FILTER SIZES
CABINET
HEIGHT
OUTDOOR
FAN
DIAMETER
FILTER SIZE
(IN. X IN.)
APPROXIMATE
AIR FLOW
RANGE (CFM)
APPROXIMATE
FILTER AREA
(SQ. IN.)*
30”
20
(2) 14”x25”
700 - 1300
700
24”
(1) 12”x20” and (1) 16”x25”
640
34”
20
(2) 16”x25”
900 - 1400
800
24”
(1) 12”x20” and (2) 10”x25”
740
38”
20”
(2) 18”x25”
1100 - 1600
900
24”
(1) 12”x20” and (2) 12”x25”
840
42”
20”
(2) 20”x25”
1300 - 1800
1000
24”
(1) 12”x20” and (2) 14”x25”
940
* Based on velocity of 300 ft/min for disposable filters.
