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9 SEALING ALONG THE PANEL GAP
IMPORTANT NOTE: To prevent cabinet "sweating", apply field
provided insulation tape along all joining surfaces between
the coil, gas furnace, duct work, and panels. See Figure11.
APPLY INSULLATION TAPE
10 DRAIN PIPING WORK
In all cooling applications where condensate overflow may cause
damage, a secondary drain pan must be provided by the installer
and placed under the entire unit with a separate drain line prop-
erly sloped and terminated in an area visible to the owner. This
secondary drain pan can provide extra protection to the area un-
der the unit should the primary drain plug up and overflow. As
expressed in our product warranty, we will not be liable for any
damages, structural or otherwise due to the failure to follow this
installation requirement.
Condensate drain connections are located in the drain pan at the
bottom of the coil/enclosure assembly see Figure 12. Use the fe-
male (¾" FPT) threaded fitting that protrudes outside of the en-
closure for external connections. The connectors required are (¾"
NPT) male, either PVC or metal pipe and must be hand tightened
to a torque of no more than 37 in-lbs, to prevent damage to the
drain pan connection. An insertion depth between .36 to .49 inches
(3-5 turns) should be expected at this torque.
1. Ensure drain pan hole is NOT obstructed.
2. To prevent potential sweating and dripping on to finished
space, it may be necessary to insulate the condensate drain
line located inside the building. Use Armaflex or similar
material.
A secondary condensate drain connection has been provided for
areas where the building codes require it. Use a downward slope
of at least ¼" per foot to provide free drainage, or as required by
local code. Provide required support to the drain line to prevent
bowing. If the secondary drain line is required, run the line sepa-
rately from the primary drain and end it where condensate dis-
charge can be easily seen.
Drain port labeled (A) in Figure 12 is the primary drain and con-
densate drain line must be attached to this drain port.
Drain port (B) is for the secondary drain line (if used).
Figure 11
NOTE:
•
Water coming from secondary line means the coil primary
drain is plugged and needs immediate attention.
•
Insulate drain lines located inside the building or above a
finished living space to prevent sweating.
•
The installation must include a "P" style trap that is located
as close as a practical to the evaporator coil. See Figure 13
for details of a typical condensate line "P" trap.
•
Trapped lines are required by many local codes. In the ab-
sence of any prevailing local codes, please refer to the re-
quirements listed in the uniform mechanical building code.
•
A drain trap in a draw-through application prevents air from
being drawn back through the drain line during fan opera-
tion, thus preventing condensate from draining and if con-
nected to a sewer line, to prevent sewer gases from being
drawn into the airstream during blower operation.
•
In a blow-through application, the drain trap prevents con-
ditioned air from escaping. It is permissible in this applica-
tion to use a shallow trap design, sometimes referred to as
a running trap. The depth of a running trap (Figure 14)
should be either 1" or a depth that permits unrestricted
condensate drainage without excessive air discharge.
•
If using copper drain line, solder a short piece of pipe, mini-
mum 6" length, to the connector before installing a drain
fitting. DO NOT over torque the ¾" copper connector to
the plastic drain connection. Using a wet rag or heatsink
material on the short piece to protect the plastic drain pan.
Connection
Cased Coil
POSITIVE LIQUID
SEAL REQUIRED
AT TRAP
8
A
B
Figure 12
Drain
2" MIN.
3" MIN.
Figure 13
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