507640-05
Page 13 of 25
Issue 2245
The filter rack must be installed prior to installation of
the unit in applications where access to the rear panel
is limited.
NOTE:
Table 2. Unit Air Filter Sizes - inches
Unit Model
Filter 1
Filter 2
24, 36
14 x 20 x 1
20 x 20 x 1
48, 60
20 x 20 x 1
Condensate Drain
This package unit is equipped with a 3/4” FPT coupling
for condensate line connection. Plumbing must conform
to local codes. Use a sealing compound on male pipe
threads.
Do not
operate unit without a drain trap. The condensate
drain is on the negative pressure side of the blower;
therefore, air being pulled through the condensate line will
prevent positive drainage without a proper trap.
The condensate drain line must be properly trapped,
routed to a suitable drain and primed prior to unit
commissioning.
NOTE:
Install drain lines and trap so they do not block
service access to the unit.
See Figure 3 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 connection with suitable
material to prevent air leakage into the return air system.
To prime trap, pour several quarts of water into drain,
enough to fill drain trap and line.
Drain lines should be hand tight only. Do not use tools
to tighten fitting into drain.
CAUTION
Minimum Pitch:
1 in (25) Per 10”
(3048 mm) of
Line
Open
Vent
Unit
Trap must be deep enough to offset maximum static difference
(generally, 3 inches (76 mm) minimum). In addition, the drain line
must be supported if longer than 10 feet.
Trap must be primed at start-up.
Mounting
Frame
Figure 3. Typical Condensate Drain Connection
Gas Piping
Proper sizing of gas piping depends on the cubic feet
per hour of gas flow required, specific 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edition) should be followed in all cases unless superseded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.
Gas piping recommendations:
• A drip leg and a ground joint union must be installed in
the gas piping. A ground joint union is recommended
by the manifold/valve.
•
When required by local codes, a manual shutoff valve
may have to be installed outside of the unit.
• Use pipe thread sealing compound resistant to
propane gas sparingly on male threads.
Never use a flame to check for gas leaks. Explosion
causing injury or death may occur.
WARNING