Certikin MB20S, Operating, Installation And Servicing Instructions

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5.0 Fault fi nding
28
Genie S
BEFORE COMMENCING OR COMPLETING ANY ELECTRICAL WORK ON THE HEATER, TURN
OFF THE MAINS ELECTRICITY SUPPLY
5.1 OPERATION SAFETY CONTROLS AND LOCKOUTS
This heater requires mains on both the Live (L) and switched live (SL) connection to be able to operate. It is
supplied with a link wire, which can be removed if a separate heater switched live is going to be used.
This heater must have a electrical & gas supply, pool pump pressure suffi cient to activate the pressure switch,
all safety devices closed and the pool temperature below set point.
If all the above are correct then the ignition control will start the following ignition sequence:
1. The fan and internal pump operates to pre-purge the heat exchanger.
2. After a few seconds a spark is created at the electrode and the gas valve is opened.
3. Once the gas is ignited the fl ame is sensed and the spark is removed.
4. The gas valve remains open and the fan speed is then modulated to the required speed according to demand.
5. If the controls fails to establish a fl ame the spark will stop and the fan and internal pump will operate on to
post-purge the heat exchanger.
6. After a failure to ignite or a loss of fl ame, the ignition sequence will be repeated up to three times, then the
control will go into a permanent lockout condition and will require a manual reset to start again.
The pool thermostat control indicates the actual and set temperature of the pool and also displays all the lock-
outs. The next pages detail the fault conditions, the indicators, the display and the actions required.
5.2 SETUP MODES
User mode
Turn off on the panel switch. Turn on with the power switch whilst pressing the Lock/Reset Button
The controls are now in “user setup mode”
(See 4.6 for information) .
Service mode
This is a special mode used to set the operation of the control and to investigate fault conditions, it is entered
from user setup mode.
Rotate pool thermostat knob fully clockwise to show the software version number.
Press the Lock/Reset button for 3 seconds. The control is now in Service Mode.
It is now possible to change some of the control’s parameters. To show them, rotate the pool thermostat
potentiometer. To zero or change them, press the Reset/Lock button
To exit, turn the power Switch off then back on again.
Test Mode 1 (td1).
Temperatures are displayed to 0.1
O
C resolution, not the normal 1
O
C
The display will now show each sensor temperature and cycle to the next for each press of the Lock/Reset button:
•
Pool temperature as normally displayed. The Green LED will be ON
• Pool temperature is displayed to 0.1 O C. The Green LED will be ON
• Heat exchanger fl ow temperature. The Yellow LED will fl ash rapidly
• Heat exchanger combustion temperature. The Red LED will fl ash rapidly
Rotating the potentiometer will change the set temperature. Pressing and holding the button whilst one of the
temperatures is displayed will ‘lock/unlock’ it on the display for continuous observation.
5.0 FAULT FINDING
Service Mode Setting Default setting Press Reset Display indicators
1 Pressure Log Number of Operations Resets to zero Yellow LED ON
2 Unused - - Red LED ON
3 Combustion Gas Log Number of Operations Resets to zero Count, Red LED fl ashing
4 Gas Lockout Log Number of Operations Resets to zero Count, Red & Yellow LED ON
5 Condensate Blocked Log Number of Operations Resets to zero Count, Front Red PCB LED ON
6 Unused - - Rear Red PCB LED ON
7 Hours run 0 Resets to zero 156 =1560 hrs, both PCB LEDs ON
8 Pool Temperature Off set 0.5
O
C (0.9
O
F) Steps of 0.5
O
C (0,9
O
F) -3.0
O
C to +3.0
O
C (-5.4
O
F to +5.4
O
F)
9 Display td0 td1 td0 / td1