10
plate. The regulator is factory adjusted to deliver gas to burner at
correct water column pressure allowing for a nominal pressure
drop through the controls.
The minimum gas supply pressure for input adjustment must
not be less than 4.5" w.c. for natural gas.
Do not subject the combination gas valve to inlet gas
pressures of more than 14.0" W.C. - natural gas. A service
regulator is necessary if higher gas pressures are encountered.
Manifold gas pressure in inches of water column is 3.5.
The gas pressure specified refers to flow pressure taken at
pressure tap of automatic gas valve while heater is operating.
FIGURE 10 - SINGLE UNIT WIRING DIAGRAM
HEATER WIRING
All electrical work must be installed in accordance with the latest
version of the National Electrical Code ANSI/NFPA No. 70, must
conform to all local code authority having jurisdiction.
AN
ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF
ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION.
If any of the original wire as supplied with the appliance must be
replaced, use only type 105°C thermoplastic or equivalent.
250°C type F must be used for the flame sensor leads and the
spark ignition cable must be high voltage 250°C.
Figures shown are valid for 0-2000 ft. installations. See “HIGH
ALTITUDE INSTALLATIONS” for deration requirements over
2000 ft.
