Water Piping - Mixing Valve Usage; Mixing Valves; Water Heater Operation - Giant UG40 Installation And Operating Manual

WATER PIPING - MIXING VALVE USAGE

DANGER
BURN
Water heated to a temperature which satisfies 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 a temperature increase
of the hot water by 11C° (20F°) higher than the heater's
temperature settings.
This appliance has been design certified as complying
with CSA Standard for water heaters and are considered
suitable for combination Water (Potable) Heating and
Space Heating but not space heating only applications.
The water supply pressure should not exceed 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 pressures.
Water Time for 1st
Temperature Degree Burns
°C (°F) (Less Severe Burns)
44 (110) (normal shower temp.)
47 (116) (pain threshold)
47 (116) 35 minutes
50 (122) 1 minute
55 (131) 5 seconds
60 (140) 2 seconds
65 (149) 1 second
68 (154) instantaneous
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong,
Sept. 15,1978)
Table 1.
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.
Table 1 (published by U.S. Government Memorandum,
1978) 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, special precautions must be taken.
Water temperature over 52°C
(125°F) can cause severe
burns instantly resulting in
severe injury or death.
Children, the elderly and the
disabled and are at highest
risk of scald injury.
Feel water before bathing or
showering.
Temperature limiting devices
such as mixing must be
installed when required by
codes and to ensure safe
temperatures at fixtures.
Time for Permanent
Burns 2nd & 3rd
Degree (Most
Severe Burns)
45 minutes
5 minutes
25 seconds
5 seconds
2 seconds
1 seconds
In addition to using lowest possible temperature setting
that satisfies demand of application, a mixing valve should
be installed at hot-water taps to further reduce system
water temperature.
Mixing valves are available at plumbing supply stores. Consult
a Qualified Installer or Service Agency. Follow mixing valve
manufacturer's instructions for installation of the valves.
Before changing the factory setting on the thermostat,
read the "Operating The Temperature Control System"
section in this manual.

WATER HEATER OPERATION

Figure 7 shows the water heater's sequence of operation
when a call for heat is initiated. The ignition control module
will attempt to light the burner three times. If the ignition
control does not detect ignition it will enter lockout mode
and flash the corresponding error code.
HEATER
THERMOSTAT
CALLS FOR
HEAT
HEATER CONTROL
CHECKS TO ENSURE
BLOWER EXHAUST
PRESSURE SWITCH
IS OPEN
BLOWER IS
ENERGIZED
CONTROL CHECKS
TO ENSURE:
EXHAUST PRESSURE
SWITCH CLOSES AND
INTAKE PRESSURE
SWITCH REMAINS
CLOSED INDICATING
BLOWER IS
OPERATING AND
THERE ARE NO
BLOCKAGES (INTAKE
OR EXHAUST)
TEMPERATURE
SWITCH REMAINS
CLOSED INDICATING
VENT TEMPERATURE
IS NOT ABOVE THE
ALLOWABLE LIMIT
9
IGNITER IS
ENERGIZED AND GAS
VALVE IS OPENED
BURNER COMES ON
AND THE FLAME IS
SENSED BY CONTROL
BURNER CONTINUES
TILL THE WATER IN
THE TANK REACHES
THERMOSTAT
SETTING
GAS VALVE IS
CLOSED AND
BURNER SHUTS OFF
BLOWER CONTINUES
FOR A POST PURGE
TIME
HEATER
REMAINS ON
STANDBY UNTIL
NEXT CALL FOR
HEAT
Figure 7.