Installation / Operation Instruction Manual

21
Servicing Guide continued-
The following unusual situations will give reason for the pressure controls to
interrupt the electrical current to the coil of the contactor:
 Upon installation or occasions of re-starting heater operation, if the
inlet supply line is closed (i.e. a shut-off valve), the high pressure
limit may be exceeded due to reasons of thermal expansion of the
water.
 If during the operation of the water heater the inlet line is closed (i.e.
a shut-off valve), a low pressure condition can develop when water
is allowed to exit through the outlet connection.
 If during the operation of the water heater the inlet line is closed (i.e.
a shut-off valve), a low pressure condition can develop when water
is removed through the water heater drain valve.
Low Water Level Control
This control will interrupt the electrical current to the contactor coil when a
low water level condition is sensed inside the water heater tank. When the
low water level condition is corrected the control will automatically sense the
new situation and electrical current will again energize the contactor coil.
Normal water heater operation will be resumed.
To remove the low water level control from the tank you must first loosen the
control by un-threading it from the tank fitting and then rotating the control
until the arrow printed on the side of the hex fitting is pointing downward.
Refer to figure 6 for clarification. This will enable the float orientation to align
itself with the opening in the tank-fitting.
Figure 6