Installation Instructions
85002
│ Gas Valve 120Vrac VK4115
| 2
Figure 2 - Gas Valve Outlet Gasket (LP-orifice)
Combustion Calibration Procedure
To calibrate burner combustion, perform the following procedure using a calibrated combustion analyzer capable of
measuring CO
2
and CO from a Natural Gas or Propane burning appliance:
1.
Set analyzer
to the appropriate fuel (Natural Gas or Propane).
2.
Gas Line Pressure Test
– monitor gas line pressure throughout all combustion tests and verify it is maintained
within tolerance. See
Gas Line Pressure Test
below.
3.
Set Throttle Screw
– operate burner to the maximum modulation rate (see Table 2); set combustion according to
Table 1 using the Throttle Screw; allow time for the analyzer readings to stabilize between adjustments – record
CO
2
value. See
Throttle Screw Adjustment
below.
4.
Set Offset Screw
– operate burner to the minimum modulation rate (see Table 2); using the Offset Screw, set the
CO
2
to 0.4-0.8% lower than the value obtained during the maximum modulation rate test (e.g. if CO
2
at Max =
9.5%, then CO
2
at Min must = 8.8-9.1%). See
Offset Screw Adjustment
below.
Combustion Calibration is mandatory
upon installation and during each annual service.
Failure to perform the Combustion Calibration in accordance with these instructions may result
in incorrect combustion leading to burner damage or excessive Carbon Monoxide concentrations
causing property damage, personal injury or death.
Carbon Monoxide
- Never leave the unit operating while producing Carbon Monoxide (CO)
concentrations in excess of 175 ppm. Failure to follow this warning may result in serious injury
or death.
LP-orifice
Outlet Gasket
Propane
–
install LP-orifice in the
outlet gasket of the gas valve
