Reznor UEAS Unit Installation Manual - Manual (Page 26)

“C”
“D”
Continue into
sanitary drain.
Minimum Dimensions for Vent Pipe Condensate Drain Trap
“C” = to suit the installation
“D” = “C” plus at least 1-1/2 inches (38mm)
Use 1/2” PVC pipe or larger for condensate trap.
The 4” PVC cleanout cap shown
here is in the vent/combustion
air kit (Option CC6 or CC2); it
is drilled and tapped
for a 1/2” NPT fitting.
HEATER
Drain Trap
OR, the vent drain connection fittings may be
field-supplied as shown above. Drain must be 1/2” or
larger. The trap requirements are the same for either
type of drain connection.
NOTE: In Canada, all PVC vent pipe must be approved to ULC S636.
FIGURE 22 - Vent Pipe Condensate Drain Trap
All electrical wiring and connections, including electrical grounding MUST be made
in accordance with the National Electric Code ANSI/NFPA No. 70 (latest edition)
or, in Canada, with CSA Standard C22.1. In addition, the installer should be aware
of any local ordinances or gas company requirements that might apply.
Check the rating plate on the heater for the supply voltage and current require-
ments. A dedicated line voltage supply with disconnect switch should be run
directly from the main electrical panel to the heater. All external wiring must be
within approved conduit and have a minimum temperature rise rating of 60°C .
Conduit must be run so as not to interfere with the heater access panel. If the
installation requires a stepdown transformer (Option CG), follow the instructions
shipped with the option package for attaching the transformer to the heater.
The electrical supply enters at the rear of the heater (
FIGURE 24). A built-in dis-
connect switch (20A @ 115V; 10A @ 230V Rating) is included. Supply wiring con-
nects to leads located inside a sealed electrical box. To maintain the sealing fea-
ture of the electrical box, always replace the cover plate.
8.0 Electrical and
Wiring
CAUTION: Route wires
so that they do not
contact the flue wrapper
or venter housing.
8.1 Electrical Supply
• FIGURE 22 illustrates the vent pipe drain trap and lists
the required length difference for the trap legs.
7.0 Mechanical
(cont’d)
The most important part of fabricating and assembling the traps is the length of
the individual legs of the traps. If the difference in the lengths of the legs of the
traps are not as illustrated, it could prevent proper drainage of the condensate and
possibly permit vent gas to enter the building. (The length difference is also what
provides a “water seal” that prevents leakage of vent gas into the sanitary drain.)
The two traps may be drained into a common pipe that is connected to the sanitary
drain.
The orientation of the piping is not critical and may be arranged to suit the installa-
tion. Unions are recommended to permit maintenance of the drains and to facilitate
service of the heater. A union is shown in both of the traps and a third union is rec-
ommended in the drain pipe. If pipe insulation or heat tapes are required to prevent
freezing, use should be in accordance with general accepted plumbing practices.
7.3 Condensate Drain System (cont’d)
Form I-UEAS, Page 26