Water Piping - Mixing Valve Usage; Mixing Valves - John Wood POWER VENTED GAS FIRED WATER HEATER Installation And Operating Instructions Manual

Water Piping - Mixing Valve Usage

MIXING VALVE
SUGGESTED PlPING
ARRANGEMENT FOR
TOP CONNECTIONS
CERTAIN
MODELS ARE
EQUIPPED WITH
SIDE PLUMBING
CONNECTIONS FOR
SPACE HEATING.
THE HOT AND
COLD FITTING
ASSEMBLlES
(PART #9001262)
CAN BE ORDERED
THROUGH AN
AUTHORIZED
DEALER
GAS
SUPPLY
DRAIN
VALVE
* NOTE: THE
T&P VALVE
CAN BE PIPED
DIRECTLY TO
THE DRAIN
Figure 11
This appliance has been design certifi ed as complying with
CSA Standard for water heaters and certain models with
side plumbing connections are considered suitable for Water
(Potable) Heating and Space Heating.
The water heater should not be subjected to excessive
water pressure fl uctuations and should not be subjected to
an operating pressure greater than 80 psi. If this occurs, a
pressure-reducing valve with a bypass should be installed in
the cold-water inlet line. This should be placed on the supply
to the entire house in order to maintain equal hot and cold
water pressure.
SHUT-OFF
TEMPERED
POTABLE WATER VALVE
COLD-WATER
INLET
TEMERATURE-
PRESSURE
RELIEF VALVE
DISCHARGE
PIPE (DO NOT
CAP OR PLUG)
TO SUITABLE
DRAIN
150mm (6")
MAX. AIR
GAP*
METAL
DRAlN
PAN
– 10 –
MIXING VALVE
SUGGESTED PlPING
ARRANGEMENT FOR
TOP CONNECTIONS
NON-TEMPERED
WATER SUPPLY
GAS
SUPPLY
DRAIN
VALVE
* NOTE: THE
T&P VALVE
CAN BE PIPED
DIRECTLY TO
THE DRAIN
Figure 12

Mixing Valves

Water heaters are intended to produce hot water. Water
heated to a temperature which satisfi es space heating, clothes
washing, dish washing, and other sanitizing needs can scald
and cause permanent injury upon contact. Short repeated
heating cycles caused by small hot-water uses can cause
temperatures at the point of use to exceed the water heater's
temperature setting by up to 11C° (20F°).
Some people are more likely to be permanently injured by
hot water than others. These include the elderly, children, the
infi rm and the physically/mentally disabled. Table 3 shows the
approximate time-to-burn relationship for normal adult skin.
National plumbing code requirements limit the temperatures of
certain fi xtures in the home. Local codes may have additional
requirements. In addition to these requirements, if anyone
using hot water in your home fi ts into one of these groups,
then you must take special precautions. In addition to using
the lowest possible temperature setting that satisfi es your
hot water needs, a means such as a Mixing Valve, should
be used at the hot water taps used by these people or at the
water heater. Mixing valves are available at plumbing supply
or hardware stores. Consult a Qualifi ed Installer or Service
Agency. Follow mixing valve manufacturer's instructions
for installation of the valves (see Figures 11 & 12). Before
changing the factory setting on the thermostat, read the
"Temperature Regulation" section in this manual.
SHUT-OFF
TEMPERED
VALVE
POTABLE WATER
COLD-WATER
INLET
NON-TEMPERED
WATER RETURN
TEMERATURE-
PRESSURE
RELIEF VALVE
DISCHARGE
PIPE (DO NOT
CAP OR PLUG)
TO SUITABLE
DRAIN
150mm (6")
MAX. AIR
GAP*
METAL
DRAlN
PAN