National Comfort Products Comfort Pack CPE U Series, Installation Manual, Page: 11 / 36

Installation Guide for Comfort Pack (CPE) Units
9
Secondary Drain Connection
Drain Pan
1/2” I.D. Tubing
Grommet
Trap
Chassis Base
“Squeeze”
Drainage
ni
t
The 3/4” I.D. flexible tubing included should be connected to the Comfort Pack primary drain connection
so that it can easily be disconnected if the cooling chassis must be removed. A trap at least 2” deep
should be provided close to the drain pan. The tubing should not be higher than the bottom of the unit
drain pan at any point to assure proper drainage and allow chassis removal. The drain line should pitch
downward at least 1” per 10 ft. to an open building drain trap.
Secondary Drain Trap Install Instructions:
1. The trap and 3” piece of clear flexible 1/2” ID tubing
are shipped loose to prevent damage. They should be
installed after the Comfort Pack unit is installed and the
return air connection completed.
2. The trap must be primed (filled with water) for proper
operation of the secondary drain system. This may be
done prior to installation of the trap or after.
3. Position the trap as shown below and slide the 3”
piece of clear flexible about 1 1/2” onto the top end of the
trap. Install the other end of the trap through the grommet
in the slide-out chassis under the indoor coil drain pan.
Slide the top of the flexible tube on the trap onto the
bottom of the 1/2” OD secondary drain connection and
push the top of the trap up. The trap should be positioned
so that there is only a small gap between the top of the
trap and the bottom of the secondary drain connection.
4. To avoid damage whenever the slide-out chassis has
to be removed from the cabinet, remove the secondary
drain trap before sliding the chassis out. After the chassis
is reinstalled in the cabinet, prime the trap with water
before reinstalling it.
Secondary Drain
SECONDARY DRAIN TRAP
MUST BE INSTALLED
Drain Pan
3/4” I.D. Flexible Tubing Included
2”
min.
Pitch Downward 1” per 10ft.
Shaded Area Represents Components
Provided and Installed By Others
Highest Point Must Not Be Above
Bottom of Drain Pan
3/4” O.D. Drain Connection
(Primary Drain)