Field Conversion Instructions

2
STEP 3
Turn on the manual gas shut off valve. Check for gas leaks.
If leaks are found, turn off the gas and repair the leaks.
STEP 4
NOTE: When converting a Natural Gas Boiler to an LP
Gas Boiler, turn the gas valve throttle screw
clockwise 1 to 2 turns.
When converting an LP Gas Boiler to a Natural
Gas Boiler, turn the gas throttle screw
counterclockwise 1 to 2 turns.
These adjustments are not final. Follow the
procedure below for final adjustments.
Turn on the power to the boiler. Place the Control Board
into System Test Mode by holding down the “Menu”
and “Select” keys simultaneously for 10 seconds. Then
press the “” key until the “” indicates System Test.
Press the “Select” key to choose the menu.
Select Maximum Power on the System Test menu. Insert
the combustion analyzer probe into the test port. See
Figure 3. The combustion readings should agree with
Table 1.
If the combustion readings do not agree with Table 1,
turn the throttle screw as shown in Figure 4 and Table 2
until the readings are within the acceptable range as
shown in Table 1. Record the High Fire combustion
readings on the combustion data sheet, Table 3.
Select Low Power on the System Test menu. Record the
Low Fire combustion readings after they have stabilized.
If the Low Fire combustion readings do not agree with
Table 1, turn off the boiler and contact your PB Heat
Representative.
Figure 4
It is very important that this conversion is set up
within the recommended combustion measurements
in Step 4. Visually looking at the flame does not
determine flame quality. A combustion measurement
using a combustion analyzer with CO and CO
2
reading capability is the only way to assure a
correct adjustment.
WARNING
PUREFIRE
®
GAS CONVERSION KIT
If you smell gas:
• Turn off the gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch: do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor's
phone. Follow gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire
department. Installation and service must be
performed by a qualified installer, service agency
or the gas supplier.
WARNING
Table 2
*Very high CO with low CO
2
indicates possible unburned gas due to
insufficient air
Turning Gas Valve Throttle Screw
If CO is
not too high
If CO is
too high
If CO
2
is
too high
Turn Clockwise (–) Turn Clockwise (–)
If CO
2
is
too low
Turn Counterclockwise
(+)
Turn Clockwise (–)*
Figure 3
Table 1
Combustion Settings
High Firing rates and Low Firing rates on all Models
Natural Gas Propane LP
Low High Low High
Carbon
Monoxide
(CO)
< 50 ppm < 100 ppm < 50 ppm < 100 ppm
Carbon
Dioxide
(CO
2
)
8.5% – 9.5% 8.5% – 9.5% 9.5% – 10.5% 9.5% – 10.5%