Page 8
Trap
Figure 13. Condensate drain and trap.
Overfl ow
To
Disposal
Water Level
Pushed Down
Slightly
Water Level
Pulled Up
2"-3"
(50-75mm)
Condensate
From
Collector
Drain
Condensate From
Vent/Blower Drains
1/4" - 3/8"
(6-10mm)
To
Disposal
Vent
Drain
Figure 12. Condensate drainage components.
Collector
Drain
Trap/
Neutralizer
Blower
Drain
drain tubes.
To install the condensate assembly, fi rst install
the short length of 5/8" I.D. tubing on the barbed
fi tting on the bottom of the condensate collector. Then
drop the condensate tray into the opening in the base
pan of the heater, bending the 5/8" tubing as necessary
to get the tube into the tray. Readjust the 5/8" tubing
so that its lower end is 1/4" - 3/8" above the bottom
of the tray. The tray can be positioned with the outlet
fi tting to the right, as shown in Figure 12, or with the
fi tting to the left, depending on the direction required
for condensate disposal. Connect the piece of 1/2" I.D.
tubing to this outlet fi tting and route it out of the heater
through the hole in the side of the base panel. This
tube carries condensate to the drain. If this disposal
tube is routed to the left, remove the plug button from
the hole on the left side of the base panel and push it
into the hole on the right side.
Connect the remaining short piece of 3/8"
I.D. tubing to the barbed tee fi tting in the tubing
immediately in front of the blower. Position this tubing
so that its bottom end is 1/4"-3/8" above the bottom of
the condensate tray. This tube provides drainage for
the vent duct and blower.
A package of limestone gravel neutralizer
is provided with the condensate assembly. Place
this gravel in the tray after installing and properly
positioning all tubes. Be sure that a limestone pebble
does not plug any of the tubes. Place the cover on the
tray when this is done.
It is important that there be no sagging sections
of tubing to trap water. Drainage to the trap and out
of the trap to the drain must be assured by continuous
downward routing of these tubes. It may be necessary
to elevate the heater to provide downward routing. The
outlet of the disposal tube must be open to the air. PVC
pipe is recommended for long drain tubes.
If a gravity drain is not available, a condensate
pump must be provided in the fi eld. Suitable
condensate pumps are available commercially at air
conditioning equipment distributors.
Incorrect installation of the condensate assembly
or tubing can result in overfl ow or waterlogging of the
vent. In normal operation, water accumulates in the
tray at the level of the outlet fi tting, and this provides
a “water seal” which accommodates combustion
system pressures. Figure 13 illustrates the water seal.
Note that water is “pulled” up toward the condensate
collector pan and is pushed down slightly by the
vent/blower drain. If there is no water seal, air rushes
into the collector drain, preventing normal drainage of
condensate water, until vent drainage provides the seal
(see Section 2L, Start-Up and Adjustment).
The installer must be sure to take whatever
measures are necessary to prevent property damage by
condensate overfl ow. If the heater location is such that
this water can directly or indirectly damage a building,
furnishings or other property, an overfl ow pan or other
appropriate preventative measure should be provided.
2I. Gas Supply and Piping
Before installing gas piping, check the rating
plate on the heater to be sure that the heater is for
use with the correct (available) gas. Make sure that
gas supply pressure is adequate per the requirements
in Table 4. Note that the system must be capable
of providing these pressures while the heater is
operating.
To Next Page
Loading...
Need help?
General
