14
DISCONNECT THE HEATER AND ITS MANUAL GAS SHUTOFF
VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING
ANY SUPPLY PRESSURE TESTING EXCEEDING 1/2 PSIG (3.45
Kpa). GAS SUPPLY LINE MUST BE CAPPED WHEN
DISCONNECTED FROM THE HEATER FOR TEST PRESSURES
OF 1/2 PSIG (3.45 Kpa) OR LESS. THE APPLIANCE NEED NOT
BE DISCONNECTED, BUT MUST BE ISOLATED FROM THE
SUPPLY PRESSURE TEST BY CLOSING THE MANUAL GAS
SHUTOFF VALVE.
GAS METER SIZE — NATURAL GASES ONLY
Be sure the gas meter has sufficient capacity to supply the full
rated gas input of the water heater as well as the requirements
of all other gas fired equipment supplied by the meter. If gas
meter is too small, ask the gas company to install a larger meter
having adequate capacity.
GAS PRESSURE REGULATOR
The gas pressure regulator is built into the gas valve and is
equipped to operate on the gas specified on model and rating
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
FIGURE 10 - SINGLE UNIT WIRING DIAGRAM SBD MODELS 120 THROUGH 500A
not be less than 4.5" W.C. (1.12 Kpa) for natural gas and 11.0"
W.C. (2.74 Kpa) for propane gas.
Do not subject the combination gas valve to inlet gas
pressures of more than 14.0" W.C. (3.48 Kpa) - natural gas,
14.0" W.C. (3.48 Kpa) - propane gas. A service regulator is
necessary if higher gas pressures are encountered.
Gas pressure specified in Table 5, refer to flow pressure taken
at pressure tap of automatic gas valve while heater is operating.
GROUNDING INSTRUCTIONS
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding conductor
must be run with the circuit conductors and connected to the
equipment grounding terminal or lead on the water heater.
HEATER WIRING
All electrical work must be installed in accordance with the
latest version of the National Electrical Code ANSI/NFPA No. 70,
and /or the CSA C22.1 Electrical Code, for Canada use Canadian
Electrical Code CSA C22.1 and must conform to all local code
authority having jurisdiction. AN ELECTRICAL GROUND IS
REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR
POSSIBLE ELECTROCUTION.