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42
GAS-FIRED HEATER Installation Manual
PART 7: VENTING, COMBUSTION AIR & CONDENSATE REMOVAL
(CONTINUED)
H. CONDENSATE REMOVAL SYSTEM
This is a condensing high efficiency appliance,
therefore this unit has a condensate removal
system. Condensate is nothing more than water
vapor, derived from the combustion products,
similar to an automobile when it is initially start-
ed. It is very important that the condensate line
is sloped away from the heater and down to a
suitable inside drain, if the condensate outlet on
the Munchkin Contender is lower than the drain,
you must use a condensate removal pump (kit
P/N 554200 available from Heat Transfer
Products, Inc.) A condensate filter, if required by
local authorities can be made up of lime crys-
tals, marble or phosphate chips will neutralize
the condensate. This can be done in the field by
the installer or you may purchase one from Heat
Transfer Products, Inc. (P/N N1100) It is also very
important that the condensate line is not
exposed to freezing temperatures, or any other
type of blockage. Plastic tubing should be the
only material used for the condensate line.
Steel, brass, copper or others will be subject to
corrosion or deterioration. A second vent may
be necessary to prevent condensate line vacu-
um lock if a long horizontal run is used. Also, an
increase in pipe size may be necessary to drain
properly. Support of the condensation line may
be necessary to avoid blockage of the conden-
sate flow.
CAUTION
The condensate line must remain unobstructed,
allowing free flow of condensate. If condensate
is allowed to freeze in the line or if the line is
obstructed in any other manor, condensate can
exit from the heater tee, resulting in potential
water damage to property.
NOTICE
Use materials approved by the authority having
jurisdiction. In the absence of other authority,
PVC and CPVC pipe must comply with ASTM
D1785 or D1784, F441 or D2665. Cement and
primer must comply with ASTM D2564 or F493.
For Canada, use CSA or ULC certified PVC or
CPVC pipe, fittings and cement. (See Table 7-9)
When installing a condensate pump, select one
approved for use with condensing heaters and
furnaces. The pump should have an overflow
switch to prevent property damage from
condensate spillage.
Condensate from the Munchkin Contender
Heater will be slightly acidic (typically with a pH
from 3.2 to 4.5). Install a neutralizing filter if
required by local codes.
Item Material United States Canada
Vent or air
pipe and
fitting
PVC schedule 40 ANSI/ASTM D1785
ULC S636
certified
only
PVC-DWV ANSI/ASTM D2665
CPVC schedule 40 ANSI/ASTM F441
ABS-DWV schedule 40 ANSI/ASTM D2661
Pipe
cement/
primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
ABS ANSI/ASTM D2235
Table 7-9