506941-01
Page 5 of 16
Issue 1148
Condensate Drain
This package unit is equipped with a 3/4” (in.) FPT coupling
for condensate line connection. Plumbing must conform to
local codes. Use a sealing compound on male pipe threads.
The condensate drain line must be properly trapped
and routed to a suitable drain.
See Figure 5 for proper
drain arrangement. The drain line must pitch
to an open
drain or pump to prevent clogging of the line. Seal around the
drain connec
Ɵ
on with suitable material to prevent air leakage
into the return air system.
Gas Piping
Proper sizing of a gas piping depends on the cubic feet per
hour of gas fl ow required, specifi c gravity of the gas, and
length of run. National Fuel Gas Code Z223.1 latest edition
should be followed in all cases unless superseded by local
codes or gas company requirements. In Canada, refer to
CAN/CGA B.149.1 & .2 (latest edition).
The heating value of the gas may differ with locality. The
value should be checked with the local gas utility. For
temperature rise of unit, see unit rating plate.
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 fl exible 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.
Filters
Filters are not supplied with the unit. Filters must always
be installed ahead of the evaporator coil and must be kept
clean or replaced. Dirty fi lters will reduce the airfl ow of the
unit. Filters should be sized in accordance with Table 1.
This unit is equipped with an internal fi lter clip which is
located in the indoor coil compartment attached to the side
of the unit drain pan.
When fastening ductwork to the side duct fl anges on unit,
insert screws through duct fl anges only. Do not insert
screws through the casing. Outdoor ductwork must be
insulated and waterproofed.
CAUTION
Typical Condensate Drain Connection
Figure 5
Table 1
Minimum Required Surface Area
for Disposable Filters
Cooling BTU/HR
Filter Area
36,000 (3 Ton)
600 Square Inches
48,000 (4 Ton)
800 Square Inches
60,000 (5 Ton)
900 Square Inches
Unit Model
Internal Filter Size
36
28” X 25”
48-60
30” X 30”
