Bell & Gossett 210668B Z-4M - Manual (Page 4)

Display Fault Notes
EEPROM The control was unable to read a piece of information from its EEPROM. This error can
FAULT be caused by a noisy power source. The control will load the factory defaults and stop
operation until all the settings are verified
OUTDOOR The control is no longer able to read the outdoor sensor due to a short circuit. In this
SENSOR case, the control assumes an outdoor temperature of 32°F (0°C) and continues operation.
SHORT Check wiring between outdoor sensor and control unit. Verify all connections and inspect
CIRCUIT wire insulation and sensor for damage. To clear the error message from the control after
the sensor has been repaired, press the Item button
OUTDOOR The control is no longer able to read the outdoor sensor due to an open circuit. In this
SENSOR OPEN case, the control assumes an outdoor temperature of 32°F (0°C) and continues operation.
CIRCUIT Check wiring between outdoor sensor and control unit. Verify all connections and inspect
for broken wire or damaged sensor. To clear the error message from the control after
the sensor has been repaired, press the Item button
BOILER The control is no longer able to read the boiler sensor due to a short circuit. In this
SENSOR case, if the BOIL MIN adjustment is set to OFF the control does not operate the Boiler
SHORT contact. If the BOIL MIN adjustment is not set to OFF and a boiler demand is present,
CIRCUIT the Boiler contact will operate for up to 10 minutes of a 20 minute cycle. Check wiring
between outdoor sensor and control unit. Verify all connections and inspect wire
insulation and sensor for damage. To clear the error message from the control after
the sensor has been repaired, press the Item button
BOILER The control is no longer able to read the boiler sensor due to a short circuit. In this
SENSOR case, if the BOIL MIN adjustment is set to OFF the control does not operate the Boiler
OPEN contact. If the BOIL MIN adjustment is not set to OFF and a boiler demand is present,
CIRCUIT the Boiler contact will operate for up to 10 minutes of a 20 minute cycle. Check wiring
between outdoor sensor and control unit. Verify all connections and inspect wire
insulation and sensor for damage. To clear the error message from the control after
the sensor has been repaired, press the Item button
Boiler Reset Controller Display Parameters
Display Parameter Notes
OUTDOOR Current outdoor air temperature as measured by the outdoor sensor. This is also the
TEMP default display for the control
BOILER Current boiler supply water temperature as measured by the boiler sensor
TEMP
BOILER Target boiler supply is the temperature the control is currently trying to maintain at the
TARGET TEMP boiler sensor
Boiler Reset Controller Fault Messages
VIEW
VIEW OUTDR
VIEW OUTDR
VIEW
BOIL
VIEW
BOIL
Mix Reset Control Set-Up Parameters
Field
Display Parameter Definition Range Notes Setting
ROOM DESIGN The room design 35°F to 100°F If the original heating system design
TEMP temperature used (1°C to 37°C) criteria are unknown, the ROOM
in the original heat DESIGN TEMP should be set to the
loss calculation for estimated highest typical (non set-
the building back) thermostat setting
OUTDOOR The outdoor design -60°F to +45F If the original heating system design
DESIGN TEMP temperature used (-51°C to 7°C) criteria are unknown, the OUTDOOR
in the original heat DESIGN TEMP should be set to the
loss calculation for estimated lowest expected outdoor
the building temperature based on geographical
location
ADJUST
ROOM
° F
ADJUST DSGN OUTDR
° F