20
CLCH-SVX08A-EN
Piping
•
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.
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
Figure 12
as a guideline for p-trap construction.
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.
Table 7.
Gas supply line connection sizes
Gas Output (MBh)
200-560
700-1000
1250-1750
2000-2400
Connection Size (NPT)
1 in.
1 1/4 in.
1 1/2 in.
2 in.
Figure 12. Heat exchanger condensate piping
J
H
L
Normal operation
Tee with cap
L=H+J+diameter where:
H = 5 inches
J = 2.5 inches
Summary of Contents for Gas Heat Sections for Performance Climate Changer Air Handlers
Page 23: ...CLCH SVX08A EN 23 Wiring Figure 13 200 1000 MBh 3 1 or 10 1 turndown wiring diagram ...
Page 24: ...24 CLCH SVX08A EN Wiring Figure 14 1250 2000 MBh 3 1 or 10 1 turndown wiring diagram ...
Page 25: ...CLCH SVX08A EN 25 Wiring Figure 15 1250 2400 MBh 20 1 turndown wiring diagram ...
Page 35: ...CLCH SVX08A EN 35 Notes ...
