46
INSTALLATION INSTRUCTIONS
Water Supply
CAUTION:
This water heater MUST ONLY
be used with the following water supply conditions to
prevent product damage and operation failure.
• Clean, potable water free of corrosive chemicals, sand,
dirt, or other contaminates.
• Inlet water temperatures above 32°F (0°C), but not
exceeding 120°F (49°C).
• DO NOT reverse the HOT and COLD water connections.
• DO NOT connect this heater to water lines previously
used for space heating. All water piping and
components shall be suitable for potable water.
• With recommended water quality (See chart below).
Thermal Expansion
A thermal expansion tank will be required if the water
heater is installed in a system with a recirculation or
storage tank. This prevents damage to the heater, related
piping, and the relief valve.
NOTICE:
Replacing the relief valve will not correct
the problem!
The expansion tank is designed with a built-in air cushion
that compresses as the system pressure increases. This
relieves the over-pressure condition and eliminates the
repeat operation of the relief valve.
For other approved methods of thermal expansion,
contact an installing contractor, water supplier, or
plumbing inspector.
Water Supply Connections
CAUTION:
IMPORTANT—
DO NOT
apply
heat to the HOT or COLD water connections. If sweat
connections are used, sweat tubing to the adapter before
fitting the adapter to the water connections on the water
heater. Any heat applied to the water supply fittings will
permanently damage the internal components of the
water heater.
NOTICE:
In cold environments, ice can
accumulate in the water heater’s connectors. Plug in the
water heater power cord for approximately 10 minutes
before making these connections. This will melt any ice
buildup.
Plumbing should be carried out by a qualified plumbing
contractor in accordance with local codes.
Only use approved plumbing materials.
To allow the full flow capacity, it is recommended to keep
water inlet and outlet pipes 3/4-in.
(1.9-cm) diameter or larger.
To conserve energy and to prevent freezing, insulate both
COLD and HOT water supply lines.
DO NOT
insulate the
pressure-relief valve.
Recirculation
Direct recirculation is allowed, provided the loop is
thermostatically controlled, and a timer is used to turn
the pump off during off peak periods. The pump must
be sized for a minimum of 5 gpm at 25 ft of head plus
building head. A 10°F difference between the loop
thermostat setting and water heater temperature setting
must be maintained.
Chart for Recommended Water Quality Levels
pH
TDS (Total
Dissolved Solids)
Free Carbon
Dioxide (CO
2
)
Total
Hardness
Aluminum
Chlorides
Copper
Iron
Manganese
Zinc
6.5–8.5
Up to 500 mg/L
Up to 15 mg/L
Up to
200 mg/L
Up to
0.2 mg/L
Up to
200 mg/L
Up to
1.0 mg/L
Up to
0.3 mg/L
Up to
0.05 mg/L
Up to
1.0 mg/L
Cited reference: National Secondary Drinking Water Regulations
Plumbing
