4
Install coils with the drain pan and/or casing on a flat, level
surface. Slope the coil 1/4” towards the drain. Condensate lines
must be installed in accordance with building codes. It is the
contractor’s responsibility to ensure proper condensate drainage
at the time of the installation; National Comfort Products bears
no responsibility for damages caused by improper condensate
management.
SOME COILS HAVE PRIMARY AND SECONDARY
DRAIN PORTS ON BOTH SIDES OF THE PAN TO OFFER
INSTALLATION FLEXIBILITY, SO ENSURE ALL THREADED
PLUGS ARE IN PRESENT AND TIGHTENED IN ANY
UNUSED DRAIN PORTS. THESE MAY BE HIDDEN BEHIND
THE COIL CASING ACCESS DOOR. FAILURE TO DO SO
MAY RESULT IN PROPERTY WATER DAMAGE; IT IS THE
CONTRACTOR’S RESPONSIBILITY TO ENSURE THESE
PLUGS ARE PRESENT AND TIGHT.
!CAUTION
The drain lines must be installed with ¼” per foot pitch to provide
free drainage. A condensate trap MUST be installed on the
primary drain line to ensure proper drainage of the condensate.
The trap must be installed in the drain line below the bottom of
the drain pan. Fig. 1 illustrates the typical drain trap installation.
Prior to installation, ensure drain pan hole is not obstructed.
Additionally, National Comfort Products recommends the drain
lines be insulated to prevent sweating and dripping.
Fig. 1
USE TEFLON TAPE TO CONNECT THE DRAIN LINES TO
THE THREADS IN THE DRAIN PAN. DO NOT USE SOLVENT
BASED PIPE DOPE. THIS WILL REDUCE THE LIFE OF THE
PAN.
!CAUTION
The drain pan has primary (white) and secondary (red) drain
connections. If a secondary drain line is required, it should be
run separately from the primary and should terminate in a highly
visible location. Condensate disposal through the secondary
drain line indicates that the primary drain line is plugged and
needs cleaning. If a secondary drain line will not be provided,
plug the secondary drain. Drain plugs are NOT to be reused
without plumbers tape or putty. Drain line connection should be
finger tightened, then turned no more than one complete turn
as needed to ensure a firm connection. DO NOT overtighten
connection or damage may occur.
Coil Installation
THE COIL IS MANUFACTURED WITH DRY NITROGEN
PRE-CHARGE. RELEASE THE PRESSURE THROUGH THE
SCHRADER VALVE TEST PORT PRIOR TO INSTALLATION.
IF HOLDING PRESSURE IS NOT PRESENT, RETURN COIL
TO DISTRIBUTOR FOR EXCHANGE.
!WARNING
Clean coil fins with degreasing agent or mild detergent and rinse
fins clean prior to installation. Refer to page 7 for coil cleaning/
maintenance guidance.
The refrigerant line sizes should be selected according to the
recommendations of the outdoor unit manufacturer.
Care must be taken to ensure all connection joints are burr-free
and clean. Failure to do so may increase chances of a leak. It is
recommended to use a pipe cutter to remove the spun closed
end of the suction line.
To reduce air leakage, rubber grommets may be present where
the lines pass through the coil case. To avoid damage, remove
grommets prior to brazing by sliding over the lines. Use a
quenching cloth or allow the lines to cool before reinstalling the
grommets.
Use of wet rags/quenching cloth is highly recommended to
prevent weld-related damages to the casing and Schrader valve
(if present).
Can be installed in either an upflow or a downflow application.
COIL SHOULD BE INSTALLED ON THE DISCHARGE SIDE
OF THE FURNACE
!CAUTION
NATIONAL COMFORT PRODUCTS COILS MAY INCLUDE
A SCHRADER VALVE ON THE SUCTION MANIFOLD.
ENSURE THAT THE SCHRADER VALVE AND VALVE
CORE (WHERE PRESENT) ARE PROTECTED FROM HEAT
TO PREVENT LEAKAGE.
!CAUTION
