34 18-CD30D1-12
Installer’s Guide
This tube on downflow units will need to be cut to fit be-
tween the Inducer and the trap. On upflow units, this tube
may need to be extended, using the tubing shipped with
the furnace.
Connections must be made to an OPEN / VENTED
DRAIN. Outdoor draining of the furnace and coil conden-
sate is permissible if allowed by local codes.
Caution should be taken to prevent drains from freez-
ing or causing slippery conditions that could lead to
personal injury. Excessive draining of condensate may
cause saturated ground conditions that may result in
damage to plants.
NOTE:
Use 1/2" or larger PVC or CPVC pipe and fittings as re-
quired for drain connections (fittings, pipe and solvent
cement not provided).
NOTE:
A corrosion resistant condensate pump must be used
if a pump is required for a specific drain system.
IMPORTANT:
The condensate drain should be installed with provisions
to prevent winter freeze-up of the condensate drain line.
Frozen condensate will block drains, resulting in Fur nace
shutdown. If the drain line cannot be installed in a condi-
tioned space, then UL listed heat tape should be applied
as required to prevent freezing (per manufacturer’s instruc-
tions). The heat tape should be rated at 5 or 6 watts per
foot at 120 volts. Self-regulating (preferred) or thermostati-
cally controlled heat tape is required.
NOTE:
All supplied flexible condensate piping is for internal
use only. All condensate piping external to the unit
must be CPVC or PVC piping.
GAS PIPING
FIRE - EXPLOSION HAZARD
DO NOT RUN FLEXIBLE GAS LINE THROUGH THE
FURNACE CABINET WALL OR WITHIN THE FURNACE
CABINET. FAILURE TO FOLLOW THIS WARNING
COULD RESULT IN PROPERTY DAMAGE, SERIOUS
PERSONAL INJURY, OR DEATH.
Use a backup wrench on the Gas Valve when installing
Gas Piping to prevent damage to the Gas Valve and
Manifold Assembly.
The upflow/ horizontal furnace is shipped standard for left
side installation of Gas Piping. A knockout is provided on
the right side for an alternate Gas Piping arrangement.
The installation of piping shall be in accordance with
piping codes and the regulations of the local gas
company. Pipe joint compound must be resistant to the
chemical reaction with liquefied petroleum gases. Flexible
gas connections, if applied, must not be routed through
the cabinet of the furnace.
Refer to Natural Gas Piping Table 13 for delivery sizes.
NOTE: Refer to local codes and the National Fuel Gas
Code, current edition, for gas pipe requirements.
The furnace and its individual shut-off valve must be
disconnected from the Gas Supply Piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
The furnace must be isolated from the Gas Supply Piping
by closing its individual manual shut-off valve during any
pressure testing of the Gas Supply Piping system at test
pressures equal to or less than 1/2 psig (3.5 kPa).
NOTE:
Maximum pressure to the Gas Valve for natural gas is
13.8" W.C. Minimum pressure is 5.0" W.C. Maximum
pressure to the Gas Valve for Propane is 13.8" W.C.
Minimum pressure is 11.0" W.C.
TABLE 13
NATURAL GAS ONLY
TABLE OF CUBIC FEET PER HOUR OF GAS
FOR VARIOUS PIPE SIZES AND LENGTHS
PIPE
SIZE
LENGTH OF PIPE
10 20 30 40 50 60 70
1/2 132 92 73 63 56 50 46
3/4 278 190 152 130 115 105 96
1 520 350 285 245 215 195 180
1-1/4 1050 730 590 520 440 400 370
This table is based on Pressure Drop of 0.3 inch W.C. and 0.6 SP.GR. Gas
All Gas fittings must be checked for leaks using a soapy
solution before lighting the furnace. DO NOT CHECK
WITH AN OPEN FLAME!
Cut off curved end of
Inducer drain hose
DOWNFLOW (HORIZONTAL)
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