CHAPTER V - ACCESSORY ITEMS
SECTION I HOT WATER SYSTEMS
1 - Description of the Hot Water Circuit
Pressure Type
Bottle Type
2 - Electrical Heating System
3 - Servicing the Hot Water System
Problem: No Hot Water
Problem. Water Too Hot
SECTION II FOOT PEDAL AND LINKAGES
SECTION I - HOT WATER SYSTEMS
PRESSURE HOT WATER SYSTEM
Since all supply water has air and gases in solution,
which are released when heated, the hot water system
must be vented to relieve these gases. This is
accomplished through the use of a double seating hot
water valve. When the valve is closed to line pressure,
the area above the seat and the hot water supply line is
open to the atmosphere, therefore no relief valve is
required.
1.
DESCRIPTION OF THE HOT WATER CIRCUIT
Pressure Type - A tee in the "Water In" connection
supplies water to the hot water valve. As hot water is
dispensed, the vent tube is closed, water flows to the
bottom of the heater tank. The pressure of the water
forces heated water from the top of the tank and through
the dispensing valve.
Bottle Type - Water runs directly from the bottom of the
shell type cooling unit to the bottom of the heater tank.
Hot water is drawn from the top of the tank when
dispensing valve is open.
CAUTION - Do not fill shell above water level normally
maintained by the inverted bottle.
A vent in the hot water system allows air and gases
common to heated water to escape to the top of the
cooling shell. Slits are provided in the bottle ring for
escape of these gases to the atmosphere.
CAUTION - When the water cooler is exposed to
freezing temperatures, the hot water system must be
drained. Connections are provided on the bottom of the
heater tank for this purpose.
2.
ELECTRICAL HEATING SYSTEM
An electrical heater element immersed in the heater tank
is used as the source of heat. The temperature of the
water is controlled by an adjustable thermostat, similar to
the ones used with the refrigeration system, to control a
maximum temperature of 1800F. When provided, an
overheat protector is located on the heater tank for
thermoprotection.
3.
SERVICING THE HOT WATER SYSTEM
Problem - No Hot Water
Solution A - Check the electrical supply to the
heating system. When this is not the source of
trouble, disconnect electrical supply and test each
electrical component individually with an ohmmeter
for continuity. Replace part proved defective.
Solution B - Older Type systems have a reset type
overheat protector. Reset overheat protector and
test thermostat for proper operation.
Problem - Water Too Hot
Solution A - The thermostat located in the machinery
compartment is adjustable. Turn adjusting screw
clockwise for cooler setting.
Solution B - The hot water tank may be cycling on
the overheat protector due to the thermostat setting
to high or burnt contacts in the thermostat. With
failure
in
adjustment
of
thermostat,
replace
thermostat.
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