Bock Water heaters OT300-A Installation And Operation Instruction Manual page 26

SECTION IV: INSTALLATION (cont.)
VENT & COMBUSTION AIR INTAKE (cont.)
Optional Condensate Drain (cont.)
• Tighten a 1/8" NPT stainless steel hose barb fitting into the hole in the PVC pipe. The
hose barb should be adaptable to 1/4" ID plastic tubing.
• Connect 1/4" ID plastic tubing to the hose barb.
• Form a trap by looping a portion of the plastic tube into a circle. Secure the loop in
place with a plastic zip tie.
• Route the plastic tubing to an appropriate floor drain. Use a condensate neutralizer if
necessary.
• Prime the loop trap with water prior to resuming operation of the water heater.
Disconnect the end of the tube that was connected to the hose barb. With the free end
above the loop trap, pour water into the tube until the loop is filled halfway.
• Reconnect the tube to the hose barb and turn on electrical power to the water heater.
Failure to prime the condensate drain loop with water will result in combustion gas
(which may contain carbon monoxide) entering the room. To avoid the risk of
asphyxiation from carbon monoxide, never operate the water heater unless the
condensate drain loop is sealed with water.
Page 26
Figure 17: Optional Condensate Drain on Air Intake Piping
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DANGER