Install Instructions

• Maximum domestic working pressure is
150 psig [10 bar].
• Water quality limitations (based on E.P.A
National Secondary Drinking Water
Regulations):
- Chloride, less than 150 ppm or mg/l
- pH value min. 6.5, max. 8.5
- Total hardness 3 - 7 grains/gallon or 50-
120 ppm or mg/l.
- Total Dissolved Solids (TDS), less than
120 ppm or mg/l.
- Iron less than 0.3 ppm or mg/l.
- Aluminum, less than 0.2 ppm or mg/l.
- Copper, less than 1 ppm or mg/l.
- Manganese, less than 0.05 ppm or mg/l.
- Zinc, less than 5 ppm or mg/l.
In hard water areas (more than 7 grains
of hardness) soften the cold domestic
supply water to the appliance to prevent
scaling.
Any water conditioning system must be
installed and maintained in accordance
with manufacturer’s specifications.
Pressure Relief Valve - Standard
Installations
The domestic water heater (if utilized) shall
have a field supplied pressure relief valve
installed within 6” [152 mm] of the DHW HOT
outlet connection with the relief valve spindle
installed in the vertical position.
The domestic water heater (if utilized) requires
a field supplied pressure relief valve identified
with the ASME V or HV symbol and set to
relieve at or below 150 psi [ 10 bar] of domes-
tic water pressure and a minimum relieving
capacity of 124,000 Btu/hr with 3/4” NPT
threads. For safe operation of the domestic
water heater, the relief valve must not be
removed from its designated location of instal-
lation or plugged.
1. The CHALLENGER is not supplied with a
150 psi [10 bar] pressure relief valve and
must be piped using a Pressure Relief Valve
connected as shown in Fig. 11 page 26.
2. To avoid potential water damage to the sur-
rounding area or potential scalding hazard
due to the operation of the relief valve, the
discharge piping:
- Must be connected to the discharge out-
let of the relief valve and directed to a
safe place of disposal.
- Length should be as short and direct as
possible. The size of the discharge line
should not be reduced, maintain the
same size as the outlet of the relief valve.
- Should be directed downward towards
the floor at all times. The piping should
terminate at least 6 inches [152 mm]
above any drain connection to allow
clear visibility of the discharge.
- Should terminate with a plain end, not
with a threaded end. The material of the
piping should have a serviceable temper-
ature rating of 250ºF [121ºC] or greater.
- Should not be subject to conditions
where freezing could occur.
- Should not contain any shut-off valves
or obstructions. No shut-off valve
should be piped between the appliance
and relief valve.
Failure to comply with the guidelines on
installing the pressure relief valve and dis-
charge piping can result in personal injury,
death or substantial property damage.
WARNING
NOTICE
BEST PRACTICE
Domestic Piping
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