Operational Faults - Siemens RVA47.320 User Manual

Siemens Building Technologies
HVAC Products
2.8

Operational faults

2.8.1 No display on the controller:
• Is the heating plant's main switch turned on?
• Are the fuses in order?
• Check the wiring
2.8.2 Controller displays the wrong time of day:
• Set the correct time of day on the controller (operating line 1).
• Set the correct time of day on the clock master (if present).
2.8.3 One of the BMUs does not switch on
• Does the BMU really have to operate? (Check cascade lead strategy, delayed
switching on?)
• Press BMU's lockout reset button.
• Check the electromechanical control thermostat (TR) and the manual reset safety
limit thermostat (STB)
• Check wiring and fuse of the BMU.
• Check communication link to the BMU (operating line 54)
• Check wiring of the cascade temperature sensors (sensor test, operating line 52).
2.8.4 One of the pumps does not run
• Is the right type of plant displayed (operating line 53)?
• Is the pump correctly defined? (Operating line 95)
• Check wiring and fuse of the pump (relay test, operating line 51)
• Check wiring of the sensors (sensor test, operating line 52)
2.8.5 D.h.w. is not being heated:
• Has the button for d.h.w. heating been pressed?
• Check setpoint of the d.h.w. temperature
• Check if d.h.w. heating is released
• Check wiring and fuse of the charging pump (relay test, operating line 51)
• Check wiring of the d.h.w. temperature sensor (sensor test, operating line 52)
• Check setting of the electromechanical control thermostat (TR) installed on the
boiler. It must be above the TKmax setting
2.8.6 The room temperature does not agree with the
required temperature level:
• Does the room temperature setpoint agree with the required temperature level?
(Knob on the controller or on the room unit)
• Is the required operating mode indicated?
• Are weekday, time of day and the displayed heating program correct?
(Operating lines 1...11)
• Has the heating curve slope been correctly set? (Operating line 17)
• Check wiring of outside sensor (operating line 52)
• Has the "Setting knob for the nominal room temperature setpoint" with the "Parallel
displacement of the heating curve" (operating line 100) been calibrated based on
the effective room temperature?
2.8.7 Error message; display shows "ER"
• Select operating line 50 which gives you the error code and error address. There,
you see the error code and the address of the error. Refer to section "Indication of
errors" for a list of the possible error codes and their descriptions.
Basic Documentation RVA47.320
Handling
31/166
CE1P2379E
15.07.2002