Table of Contents
Advertisement
WATER PIPING
Read all installation requirements in this manual before
installation
begins.
The water piping installation must conform to these instructions
and to all local and national code authority having jurisdiction.
Costs to diagnose, perform service and repair damage caused
by installation errors are not covered under the limited warranty.
Costs to correct installation errors are not covered under the
limited warranty.
MINIMUM PIPE SIZE
The inlet (return) and outlet (supply) water piping installed be-
tween the HPWH unit and the storage tank must not be smaller
than the water connection sizes on the HPWH. See Table 4, be-
low, for water line connection sizes and water flow rates.
Water line sizing is a critical installation requirement. Installing
undersized water piping between the storage tank and the
HPWH unit will cause insufficient water flow and will have an
adverse impact on performance and equipment life.
TABLE 4
Water Connection and Flow
Water Flow Rate
(GPM)
Unit
Single
Pass
C25W
2.5
C60W
6
9
C90W
C125W
12.5
C185W
18.5
25
C250W
PIPE SUPPORT
All water piping must be properly supported per local code
requirements.
PIPE INSULATION
All piping installed between the HPWH unit and the storage
tank must be insulated.
COLD WATER SUPPLY
Cold water supply lines should not be connected directly to
the HPWH inlet or T fitted into the inlet (return) water piping.
The cold water supply lines should be connected directly to
the storage tank only. See Inlet & Outlet Water Temperature
on page 8 and Figure 7 and Figure 8 on page 16.
WATER PRESSURE
System water pressure should be maintained between 40 and
60 PSI. Local code may require, and the manufacturer recommends,
installing a pressure reducing valve (PRV) in the cold water
supply to the building to maintain consistent water pressure
Connection Size
(Inches)
Multi
Single
Multi
Pass
Pass
Pass
5.4
3/4"
3/4"
13
1"
1"
20
1"
1 1/2"
25
1"
1 1/2"
40
1 1/2"
2"
50
1 1/2"
2"
.
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements or
such conditions as high line pressure, among others, have
installed devices such as pressure reducing valves, check
valves, and back flow preventers. Devices such as these cause
the water system to be a closed system.
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed
system the volume of water will grow when it is heated. As the
volume of water grows there will be a corresponding increase
in water pressure due to thermal expansion. Thermal expansion
can cause premature failure (leakage) of storage tanks, water
heaters and HPWH components such as the condenser. Leakage
caused by thermal expansion is not covered under the HPWH
limited warranty.
Thermal expansion can also cause intermittent Temperature-
Pressure Relief Valve operation: water discharged due to
excessive pressure build up. The Temperature-Pressure Relief
Valve is not intended for the constant relief of thermal expansion.
A properly sized thermal expansion tank must be installed on
all closed systems to control the harmful effects of thermal
expansion. Contact a local plumbing service agency to have a
thermal expansion tank installed on all closed water systems.
MIXING VALVES
Water heated to a temperature which will satisfy clothes washing,
dish washing, and other sanitizing needs can scald and cause
permanent injury upon contact. See Table 5, page 12.
Some people are more likely to be permanently injured by
hot water than others. These include the elderly, children, the
infirm and the physically/mentally disabled. The Table below
shows the approximate time-to-burn relationship for normal
adult skin. If anyone using hot water provided by the water
heater being installed fits into one of these groups or if there is
a local code or state law requiring a certain water temperature
at the point of use, then special precautions must be taken.
In addition to using the lowest possible temperature setting
that satisfies the demand of the application a Mixing Valve
should be installed upstream from the building fixtures or at
the hot water taps to further reduce system water temperature.
11
Advertisement
Table of Contents
