Rheem 70103 - Operational Flow Chart - 703 Series

12
TM063 701, 702 & 703 Series Boiling Water Unit Service Instructions
Revision D: Feb 2017
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Operational Flow Chart – 703 Series
(7)
(4)
(2, 6)
YES
(1)
Plug In
Power On
Fault rectified Isolate Power
NO
Inlet solenoid off
(if on)
Control board triac
(element) disabled
Control board
relay off
NO
Inlet solenoid on
Control board triac
(element) off (if on)
NO
Inlet solenoid
off after 30 seconds
Calibration cycle
performed
Control board
relay on
Control board triac
(element) on 20% - 100%
Water temp (Treq)
maintained at 0ºC
(element off)
NO
YES
YES
YES
YES
YES
Inlet solenoid on
Inlet solenoid off
YES
Inlet solenoid off
Control board triac
(element) on 20% - 100%
Notes:
(1) Control board relay on = Boiling water triac (element) circuit enabled.
(2) The PCB monitors for faults while ever the boiling water unit is operating.
(3) ‘Tb’ is the boiling point temperature detected during calibration; ‘Treq’ is the temperature the water will be maintained at; ‘T0’ is
the water temperature detected by the boiling water thermistor.
(4) Calibration is automatically performed by the control board on initial power up. Calibration will take approx 18 - 30 minutes
(depending upon capacity) during which time 2 heating cycles will be performed. The tap should not be operated whilst calibration
is being performed. Also refer to note 8.
(5) When measured using a conventional multimeter the voltage will be approx. 48 – 240 VAC.
(6) Critical faults are; Hot Sensor O/C or S/C, Triac S/C & Level Probe shorted to earth.
(7) Control board relay off = Boiling water triac (element) circuit disabled.
(8) To activate sleep delay mode: (NZ) press and release the ‘eco’ button whilst the eco circle surround is extinguished, (AU) press
the ECO button whilst the green ECO LED is extinguished. When the ‘eco’ button is released: (NZ) the eco circle surround, (AU)
the ECO LED will illuminate green to indicate the unit is in sleep delay mode. When the unit is asleep the ‘Press eco to heat’ text
will illuminate: (NZ) green, (AU) ‘ECO’ within the text ‘PRESS ECO TO HEAT” illuminates Red.
(9) To deactivate sleep delay mode press and release the ‘eco’ button: (NZ) whilst the eco circle surround is illuminated green, (AU)
press the ECO button whilst the green ECO LED is illuminated. When the ‘eco’ button is released the: (NZ) eco circle surround,
(AU) ECO LED will extinguish.
(10) Calibration mode can be entered by removing power supply then holding the ECO button in the depressed position whilst
restoring power supply. The ‘HEATING LED’ will illuminate and flash at which time the ECO button can be released. The unit will
now recalibrate.
Critical fault
detected?
Sleep delay
mode activated?
Sleep delay
mode
deactivated?
‘T0’ < 70°C
for 3.5 days?
High level probe
detects water?
‘T0' < ‘Tb’-3?
Low level probe
detects water?
Auto calibration
already
performed?
‘T0’ = ‘Treq’-2? ‘T0’ < ‘Treq’-3?
Inlet solenoid off after
15 seconds (if on)
(5)
(3)
(3)
(3)
(3)
‘Treq’ becomes ‘Tb’-3
‘Treq’ becomes ‘Tb’-2
Critical fault detected?
YES
NO
NO
(2, 6)
(3)
‘T0' = ‘Treq’?
Control board triac
(element) off
(3)
YES
NO
NO
NO
YES
NO
High level probe
detects water?
YES
NO
(3)
Control board triac
(element) on 20% -
100%
YES ‘T0’ = 70°C?
NO
Control board triac
(element) off
YES
(3)
(5)
(5)
Low level probe
detects water?
NO
YES NO
YES
A
A
YES
Water temp (Treq)
becomes ‘Tb’ - 3
Calibration
mode entered?
YES
NO
NO
(10)
2 hrs since last
solenoid valve
operation?
YES
NO
(8)
(8) (9)
(9)
Note: Refer to page 21 for timer LED indication.