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  Condensate Trap and Drain Line.

1.  All condensate, which forms in the boiler or vent 

system, collects in the sump under heat exchanger 
and leaves the boiler through factory installed 
condensate trap.

2.  The trap allows condensate to drain from sump 

while retaining flue gases in the boiler. The trap 

has factory installed overflow switch, which shuts 
down the boiler in the event the drain line becomes 
obstructed, preventing proper condensate removal.  
Refer to Section XIII “Service and Maintenance” 

for condensate trap and condensate overflow switch 
removal and replacement procedure, if required.

3.  Note the following when disposing of the 

condensate:

a.  Condensate is slightly acidic, typical pH around 

3.5 - 4.5. Do not use metallic pipe or fittings in 

the condensate drain line. Do not route the drain 
line through areas that could be damaged by 
leaking condensate.

b.  Do not route or terminate the condensate drain 

line in arrears subject to freezing temperatures.

c.  If the point of condensate disposal is above the 

trap, a condensate pump is required to move 
the condensate to the drain. Select a condensate 
pump approved for use with condensing 

furnaces. If overflow from the pump would 
result in property damage, select a pump with an 

overflow switch. Wire this switch in series with 
installer provided external high limit, to shut off 
the boiler, and, if desired, in series with installer-
supplied alarm, to trigger an alarm in the event 

of overflow.

d.  Do not attempt to substitute another trap for one 

provided with the boiler.

e.  In order for boiler to work properly, the boiler 

must be leveled during installation.

4.  The condensate trap stub is located at boiler left 

side, below inlet and outlet water pipe connections. 
Refer to Figures 1A and 1B.

5.  Condensate trap must be filled up with water, 

prior to boiler start-up and before connecting any 
condensate line to the boiler, to insure combustion 

products cannot escape from operating boiler. To fill 

the trap, inject water in the amount of 1 cup (8 fluid 

ounces) through condensate trap stub opening. Do 

not overfill the trap.

6.  If any additional condensate drain line is needed, 

construct the extension from PVC or CPVC 
Schedule 40 pipe. The factory supplied ¾” x 5-5/8” 
long PVC coupling, located in the Part Carton, must 
be used to connect drain line to the condensate trap 

stub. Do not over tighten coupling compression nuts 
when connecting drain line and condensate trap 
stub.

1.  Some jurisdictions may require that the condensate 

be neutralized before being disposed of. Follow 
local codes pertaining to condensate disposal.

2.  A Condensate Neutralizer Kit (P/N 101867-01) 

is available as optional equipment. Follow local 
codes and instructions enclosed with the kit for 
Condensate Neutralizer installation.

3.  Limestone chips will get coated by neutral salts 

(product of chemical reaction between limestone 
and acidic condensate) and lose neutralizing 
effectiveness over time. Therefore, periodic 
condensate neutralizer maintenance and limestone 
chip replacement must be performed. A pH test or 
acid test kits are available from HVAC/plumbing 
distributors and should be used to measure 
condensate acidity before/after neutralizer thus 
indicating a need for service and chip replacement.