Installation - Piping
7
General Piping
• For domestic water piping diagrams, see page 9.
• See pages 10 and 11 for boiler water piping.
• See water heater specifications for domestic
and boiler piping connection sizes, page 25.
• All plumbing must meet or exceed all local,
state and national plumbing codes.
• The supplied sealant is suitable for potable
water systems. Use only the supplied sealant
on all Comfort fittings/joints.
• Use isolation valves to isolate system components.
Domestic Piping
• Union on domestic hot water outlet should be
piped at a higher elevation than domestic water
drain valve. This will make draining the water
heater easier.
• Install unions for easy removal of water heater.
It is recommended to use dielectric unions or
couplings to protect hot and cold water fittings
from corrosion when connecting dissimilar
materials such as copper and galvanized iron
pipe.
• If copper pipe is used for domestic water con-
nections, first solder pipe to a threaded adapter
and then screw adapter into cold water inlet on
top of water heater. Inlet contains an internal
plastic dip tube which can be damaged by heat
from soldering.
Do not apply heat to the cold water inlet
when making sweat connections to water
heater. Sweat tubing to adapter before fit-
ting adapter to cold water inlet of heater. It
is imperative that no heat be applied to the
cold water inlet, as it contains a non metal-
lic dip tube.
• When the water supply pressure is higher than
70 psig, it is recommended to install a pressure
reducing valve on cold water supply line to
prevent water loss through T&P relief valve.
• If water heater will replace tankless coil in
boiler, disconnect piping to coil. Allow water
to drain from coil. Do not plug tankless coil.
Plugging tankless coil inlet and outlet will
result in severe personal injury, death, or
substantial property damage.
NOTICE
DANGER
Comfort manual _Comfort 55 9/8/14 10:29 AM Page 9