Thermal Solutions EVS SERIES, Installation, Operating And Service Instructions

Page: 54 / 92

54
LCD Display
Alarm Message
Recommended
Action
Explanation
Remote Input Fail
Check Wiring and
Remote System
Remote Control Input Fail
The Remote Control Input is configured and is not connected or is above or be-
low a valid range. When the remote control input fails, the following control mode
changes are taken automatically:
Selected Modes Resulting Control Mode
Remote Mod Outlet Sensor and Local Setpoint
Remote Mod & Remote Sensor Remote Sensor and Local Setpoint
Remote SP Outlet Sensor and Local Setpoint
Remote SP & Remote Sensor Remote Sensor and Local Setpoint
Comm Failure
Confirm each boiler has
a unique address
Check Wiring and
Remote System
Communication Failure
The Modbus or Peer-To-Peer network has failed. When the Modbus network fails
the following control mode changes are taken automatically:
Selected Modes Resulting Control Mode
Modbus Mod Outlet Sensor and Local Setpoint
Modbus Mod & Remote Sensor Remote Sensor and Local Setpoint
Modbus SP Outlet Sensor and Local Setpoint
Modbus SP & Remote Sensor Remote Sensor and Local Setpoint
After a Modus communication failure, the ‘Comm Failure’ alarm is not cleared
until communication is restored and successfully writes to both the Remote On
/ Off Modbus Command (00004) and Remote Firing Rate or Remote Setpoint
(40006) points have been completed, power is cycled or the protocol parameter is
changed to Peer-To-Peer and then back to Modbus.
When a Peer-To-Peer network has failed the boilers begin operation as stand
alone boilers using the selected parameters.
After a Peer-To-Peer communication failure the ‘Comm Failure’ alarm is not
cleared until communication is restored and the boiler rejoins a network with at
least one other boiler, power is cycled or the protocol parameter is changed to
Modbus and then back to Peer-To-Peer.
Low Inlet Temp
Check return water
temperature. Consider
system or operational
changes to avoid low
temperature events
Check wiring and
sensor
Low Boiler Inlet Temperature
If the boiler inlet temperature is below the low boiler inlet temperature setpoint,
the “Low Inlet Temp” Message is displayed and the boiler inlet temperature
history is stored.
Memory Failure
Call Factory Reset
all memories in
System menu:
Clr BIT History
Clr Alarm Hist
Clr Run Time Cnt
Clr Cycle Cnt
Factory Defaults
(Factory Level
Password is required)
Memory Failure
New software has been installed in the Thermal Solutions Boiler Control (TSBC)
or a power interruption has caused a memory failure. The Call For Heat will be
prevented until the condition is cleared.
Alarm Messages (continued)
B.
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