CONQUEST
®
WATER HEATER
36
PV500-70 10/15
2. The second screen will display the software revision for the touch panel display. Press the enter button to view.
3. The third screen allows the user to turn the display backlight ON continuously, OFF or TMPY will keep the
backlight on only during use.
4. The fourth screen allows the user to choose between Fahrenheit and Celsius.
5. All of the following screens will display the most recent alarm messages up to 15. The Status field will show
messages beginning with the most recent. This screen will display the time and date of the failure.
11 COMMUNICATIONS AND DIAGNOSTICS
11.1 Indicators
The PIM has three LED indicators to display operational status and to help diagnose system error conditions:
•
Power: Green LED indicating the PIM module is receiving 24 VAC power.
•
Alarm/Test: Amber LED which indicates the PIM is in Commission Test Mode or that a diagnostic alarm (fault)
is present.
•
Diagnostic
Code:
Red LED that is normally off. During a control or system fault condition, this LED flashes the
error codes.
11.2 Alarm Messages – Diagnostic Codes (Flashes)
ALARM
MESSAGE
DISCRIPTION OF ALARM
LED
Flashes
MODBUS
CODE #
ID CARD
The ID card is connected to the PIM control board when the system is initialized for
the first time, the ID card selects the control profile to be used. An ID card error
may occur when the original card is replaced with an incorrect card or has been
disconnected from the PIM control board.
Red LED
ON, Green
LED OFF
20
INTERNAL FAIL
The PIM control board may have failed. Replace the control board if manually
resetting the control does not correct the fault.
Red LED
ON
21
CTL SETUP FAIL
Try resetting the defaults in the TOOL BOX menu. If unable to correct, replace the
control display
N/A 1
VENT LIM
The vent temperature sensor is approaching the programmed limit. This will force
the burner to operate at a reduced firing rate to prevent overheating.
N/A 5
AIR FLOW FAIL
During blower purge periods the air flow proving switch is not closing this circuit.
This could be caused by a faulty blower or pressure switch.
1 9
FLAME FLSE
A false flame signal is usually cause by a leaky gas valve which propagates a
flame after the call for heat cycle has ended. Check for leakage through the gas
valve. If no mechanical cause can be found, replace flame control.
2 19
FLAME FAIL
Flame failure indicates that during the burner ignition process, the burner either
failed to light or it did light but no flame signal was detected. If the burner fails to
light it is likely that the hot surface igniter (HSI) is faulty or the burner fuel/air
mixture is too far out of adjustment to ignite. If the burner lights but immediately go
out, check for an inadequate gas supply, faulty gas valve or regulator or poorly
adjusted combustion.
3 15
FLAME LOSS
Flame loss indicates that sometime after flame has been established and the
burner is operating, the flame signal is lost. This can be caused by a faulty igniter,
damaged refractory or combustion that becomes poorly adjusted as the burner
modulates to higher inputs.
3 16
LOW HSI
The PIM control board is not sensing the correct amp draw from the HSI (Hot
Surface Igniter). This is most likely caused by a faulty or disconnected igniter.
4 23
LOW 24VAC
The 24VAC supply to the PIM control is below the threshold for reliable control
operation. This may be caused by low voltage to the heater or a faulty 120/24VAC
supply transformer.
5 24
VENT MAX
The vent temperature sensor is used to protect low temperature vent systems from
damage caused by high flue gas temperatures. When this alarm occurs, first
confirm that the vent material is suitable for the application as well as the limit
setting for this control. When this product is operated with high return or inlet water
temperature, the flue gas can exceed the rating of low temperature vent systems.
6 17
