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Piping
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Table 7.
Gas Output (MBh)
Connection Size (NPT)
Heat Exchanger Condensate Piping Recommendations
Condensate usually does not form in the heat exchanger during normal heating operation.
However, if the unit operates for extended periods of time at very low fire, or if the air handler
serves as a cooling unit also, condensate can form in the heat exchanger and should be removed.
All units are equipped with a condensate drain and drain valve. The condensate drain is on the
same side as the gas train located inside the piping vestibule.
Since the drain line is equipped with a shut-off valve, a condensate p-trap is not required, but may
be installed for convenience to avoid periodic manual draining. If a p-trap and drain is to be
connected to the condensate drain line, consult local plumbing codes for disposal of the
condensate may be a slightly acidic solution.
Use
The use of a tee-fitting at the connection to the condensate outlet is recommended. This allows for
priming and cleaning the trap. If a tee-fitting is used, be sure to furnish a plug or cap for the clean
out opening. Be sure to replace the plug after priming or cleaning the trap.
Figure 12. Heat exchanger condensate piping
L=H+J+diameter where:
H = 5 inches
J = 2.5 inches
20
If the gas pressure regulator serves more than one heating unit, it must be sized appropriately
to ensure that the inlet gas pressure at each unit is 7 to 14 inches wc while all burners are firing.
Nine inches wc is required for 1250 to 2000 10:1 turndown heaters. Gas pressure must not
exceed 14 inches wc when all units are off.
Check the gas supply pressure before making the final connection to the unit. If the gas pressure
is too high, damage to the gas valve could occur.
Gas supply line connection sizes
Figure 12
as a guideline for p-trap construction.
200-560
700-1000
1 in.
1 1/4 in.
Normal operation
L
1250-1750
2000-2400
1 1/2 in.
Tee with cap
CLCH-SVX08A-EN
2 in.
H
J
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