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LOCATION OF CONTROLS
WARNING: Installation, adjustment and service of heater controls, including timing of various operating
functions, must be performed by Rheem Service. Failure to do so may result in control damage, heater
malfunction, property damage, personal injury, or death.
WARNING: Turn off the power to the heater before installation, adjustment or service of any heater
controls. Failure to do so may result in board damage, heater malfunction, property damage, personal
injury, or death.
CAUTION: This appliance has provisions to be connected to more than one power supply source. To
reduce the risk of electric shock, isolate all such sources before servicing.
Ignition Control Functions
When there is a call for heat, and all safeties are closed, then the combustion air blower starts to purge
air from the combustion chamber. After the pre-purge, the igniter is energized. The ignition module will
attempt to light only one time before lockout occurs. To reset the lock-out, press and release the RESET
button located on the right of the control panel. Turning off the power to the heater WILL NOT reset
the ignition module.
High Limit - PIM™
The PIM™ high limit utilizes a dual element sensor located in the outlet header (see
Fig.
47). The set
point is fixed depending on the type of heater supplied ('H' model or 'W' model). To reset a high limit
lock-out, press and release the RESET button located on the right of the control panel.
High Limit— Adjustable Auto Reset
The adjustable auto reset high limit is located behind the touch screen swing out door on the left hand
side and senses water in the outlet header. (see
Fig.
48). The purpose of this high limit is to prevent
undesirable conditions from affecting the water heater without causing nuisance tripping. Once
conditions return to within specification, the high limit will automatically reset. Adjust the setting to
approx. 10°C above desired outlet temperature.
Fig 47: High Limit (Manual Reset)
Fig. 48: Adjustable High Limit (Auto Reset)
79
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