2
1.0 Adjusting the Gas Valve
The FTG 600, FTG 800, FTG 1200 & FTG 1400 are converted from Natural to LP Gas by
adjusting the Throttle/Input Screw located on the gas valve; unlike most LP conversions an
LP orifice is
NOT
used.
1.
Locate the Throttle/Input Adjustment Screw on the gas valve, see Figure 1-1.
2.
Turn the Throttle Screw all the way in (clockwise until it stops).
3.
Turn the Throttle Screw counterclockwise (out) ½ of a turn (¾ of a turn for FTG 1400).
4.
Proceed to Section 2.0,
Gas Valve and Burner Setup
, for instructions on how to test the Gas Line Pressure and
perform the Combustion Calibration.
Figure 1-1 Throttle/Input Screw Adjustment
2.0 Gas Valve and Burner Setup
Failure to perform the Gas Valve and Burner Setup correctly may result in incorrect
operation, component failure, property damage, serious injury or death.
Operating Sequence
Prior to commencing the Gas Valve and Burner Setup, perform the following operating sequence check:
1.
Turn the supply of gas to the boiler off.
2.
Set the thermostat to the highest setting.
3.
Ensure the combustion fan pre-purges for at least 30 seconds prior to activating the igniter.
4.
Ensure the combustion fan post-purges for at least 60 seconds prior to reactivating the igniter.
5.
Set the thermostat to the lowest setting and continue with the Gas Valve and Burner Setup procedure outlined
below.
DO NOT Adjust
Gas Valve
Manifold Pressure Test Port
(located on gas valve outlet
flange)
Throttle / Input Adjustment Screw
–
using a 3 mm
hex wrench, turn screw
all the way in (clockwise) until it stops,
then turn out (counterclockwise) ½ a
turn (3/4 of a turn for FTG 1400), then
proceed with Combustion Calibration.
Line Pressure Test Port
(located on gas valve inlet
flange)
Venturi
Combustion Blower
Air Filter
Cap
(remove to access Throttle
Adjustment Screw)
Low Gas Pres. Switch
(auto-reset)
High Gas Pres. Switch
(manual reset)
