Keystone Boilers and Water Heaters
Page 27
6B.2 Piping Requirements
Water piping should be supported by suitable
hangers and floor stands. Do not support piping with the
appliance. Due to expansion and contraction of copper
pipe, consideration should be given to the type of
hangers and supports used. Rigid hangers may transmit
noise through the system resulting from piping sliding
in the hangers. It is recommended that padding be used
when rigid hangers are installed. Maintain 1" (2.5cm)
clearance to combustibles for hot water pipes.
Pipe the discharge of the relief valve (full size) to
the drain or in a manner to prevent injury in the event of
pressure relief. Install a diaphragm-type expansion tank,
flow check, and shutoff valves where needed or as
required by code.
The piping should be installed such that the pump
supplies flow to the heater it is attached to only.
Properly-sized field-supplied pumps should be used.
SECTION 6B.
Water Connections - KW Water Heater
Section 6 is divided into two parts. The first is
for KS models and is Section 6A. The second
is for KW models and is Section 6B. Refer to
the proper section for instructions in installing
and piping your product. Refer to Table 9 for
pipe sizes required.
6B.1 KW Water Quality
KW water heaters must be installed in water
conditions of 10gpg hardness or less with a pH range of
6.5 to 8.5. Operating the KW in water with higher
hardness levels will cause heat exchanger fouling,
erosion, or corrosion leading to premature component
failure, reduced efficiency, heat exchanger failure or
system failure. Failure of this type will not be
warranted. If the water in use exceeds the conditions
recommended water softeners or other devices should
be installed to improve water quality.
Figure 21. DHW Piping, One Heater, One Vertical Tank.
NOTES:
1. Optional CWMU & Recirc. line location.
2. Locate KW DHW sensor or remote aquastat well
in lower 1/3 of tank.
3. Back flow preventer may be required - check local codes.
4. Thermal expansion tank may be required - check local codes.
5. Caution: Pump sizing must be based opon water hardness at job site.
6. Pipe size between Keystone and storage tank must be the same as the
Keystone heater.
7. Size pump based on a maximum delta T of 15 degrees at full input rate.
WARNING: THIS DRAWING SHOWS
SUGGESTED PIPING CONFIGURATION AND
VALVING. CHECK WITH LOCAL CODES AND
ORDINANCES FOR ADDITIONAL REQUIREMENTS.
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