Unit installation

15
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 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 lV, refer to flow pressure taken at
pressure tap of automatic gas valve while heater is operating.
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.
For Canadian installations the electrical connections and
grounding shall be done in accordance with current Canadian
Electrical Code CSA C22.1, Part 1 and/or local codes.
If any of the original wire as supplied with the appliance must be
replaced, use only type 105
0
C thermoplastic or equivalent. 250
0
C
type F must be used for the flame sensor leads and the spark
ignition cable must be high voltage 250
0
C.
FIGURE 11
SINGLE UNIT WIRING DIAGRAM BTR(C)-120 THROUGH BTR(C)-500A