AERCO BMS 168 - Manual (Page 74)

H-4
Appendix H
_____________________________
Table H2 Common Problems - Continued
Problem Possible Causes Solution
Boilers overshooting
setpoint or tripping
aquastat • Header sensor not installed
correctly
• PID setting require
adjustment
• Adjustable aquastat set too
low
• System pumps are shut
down and not controlled by
or interlocked with the BMS
• BMS is set to ALWAYS
ENABLE
• Check header sensor connections
and installation.
• Adjust PID settings. See para. 4.4.7
• If aquastat is set lower than 200°F,
reset it to 220°F.
• If system pumps are shut down,
check start and stop temperatures
on energy management system.
They should correspond to those
set in the BMS. In addition, interlock
wiring can be run between the BMS
and energy management system to
disable the BMS pumps when
pumps are not running.
• If BMS is set to ALWAYS
ENABLED, change it to START
ENABLED
Modbus Network faults
encountered. Boiler
plant not operating • BMS or boilers not properly
configured for Modbus
communication
• Refer to Modbus Communication
Manual GF-114. Check all wiring
connections and software menu
settings.