Wayne P250 - Final Steps of Setup

64659-001 REV. A 07/06/18
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To set the low pressure setting:
 Determine the recommended manifold gas
pressure setting based on the table at right.
 Locate the 5mm low pressure adjustment
nut. This is the smaller nut located on the
valve coil.
 Set the appliance to call for full fire and run
for five minutes.
 Turn off power to the burner, set the dip
switches so that only #7 is on (see Figure 10),
and turn burner power back on.
 Run in this low fire mode for one minute.
 Turn the low pressure nut counterclockwise
to reduce the pressure; turn clockwise to
increase the pressure. Adjust until the
desired pressure setting is achieved.
 Careful! Reducing the pressure too much or
too quickly may cause the burner to go out. If
this happens, turn the small nut clockwise ¼
to ½ a turn then repeat the steps above.
After setting the high and low pressure settings:
 Turn off the appliance.
 Close the manual gas valve on the gas supply line.
 Remove the manometer hoses and tighten the pressure tap screws where the hoses were.
Final Steps of Setup
Turn off power to the burner system and wait for all lights on the iHEAT board to go off. Set the dip
switches on the board in the proper positions for normal operation according to the table given in the
Dip Switches section.
Run the appliance at full fire for ten minutes, and then check the burner exhaust with a combustion
analyzer. For natural gas, it is desirable to set the burner to achieve a CO
2
reading between 8% to 10%,
an O
2
reading of 3% or above, and a CO reading of less than 100 ppm. The CO reading should never be
above 400 ppm. Increasing the air shutter opening will generally decrease the CO
2
and CO readings. The
desired range for propane gas is a CO
2
reading of between 10% to 12%, an O
2
reading of 3% or above,
and a CO reading of less than 100 ppm.
Natural gas
Propane gas
Low pressure setting
0.2" w.c.
0.8" w.c.
Table 10 - Recommended Manifold Pressure Settings
Figure 10 - Dip switch positions to make the appliance fire at the
lowest rate: switch 7 on, all others off. Turn off power to the board
before adjusting dip switches.