Install Instructions

39
Tech.Doc - 03/21 - Subject to change. © Belimo Aircontrols (USA), Inc.
ZIP Economizer
Fault Detection and Diagnostics (FDD) Table
Fault Detection Problem
Diagnostic Action
(in addition to alarm stored / transmitted)
Potential Cause
CA Fault
Code
OAT sensor
out of range
Sensor is returning a
value that is out of the
predetermined range
• Economizing functionality disabled
• OA damper returns to minimum position
• Compressor low temp lockout disabled
• Thermistor failure
• Damage to wire affecting resistance output
A, B
OAT sensor
not detected
Sensor previously
installed is not detected
or sensor has not been
installed
• Economizing functionality disabled
• OA damper returns to minimum position
• Compressor low temp lockout disabled
• Sensor never installed
• Installed sensor has open or short
• Wire harness broken
A, B
OAH sensor
out of range
Sensor is returning a
value that is out of the
predetermined range -
Single Enthalpy
• Economizing functionality disabled
• OA damper returns to minimum position
• Supply voltage too high
• Sensor electronics failure
• Sensor element failure
• Sensor used is not correct range
A, B
Sensor is returning a
value that is out of the
predetermined range -
Differential Enthalpy
• Economizing functioning by differential
temperature with return air humidity limit
A
OAH sensor
not detected
Sensor previously
installed is not detected
or sensor has not been
installed -
Single Enthalpy
• Economizing functionality disabled
• OA damper returns to minimum position
• Sensor inadvertently installed, not deleted
• Supply power missing
• Sensor electronics open
• Wire harness broken
A, B
Sensor previously
installed is not detected
or sensor has not been
installed -
Differential Enthalpy
• Economizing functioning by differential
temperature with return air humidity limit
A
RAT sensor
out of range
Sensor is returning a
value that is out of the
predetermined range -
Differential Temperature
• Economizing functioning by OAT single dry bulb
• Change over limit modified to suit single dry
bulb
• Thermistor failure
• Damage to wire affecting resistance output
A
Sensor is returning a
value that is out of the
predetermined range -
Differential Enthalpy
• Economizing functioning by OAE single
enthalpy
• Change over limit modified to 28btu/lb 75°F
A
RAT sensor
not detected
Sensor is returning a
value that is out of the
predetermined range -
Differential Temperature
• Economizing functioning by OAT single dry bulb
• Change over limit modified to suit single dry
bulb
• Installed sensor has open or short
• Wire harness broken
A
Sensor is returning a
value that is out of the
predetermined range -
Differential Enthalpy
• Economizing functioning by OAE single
enthalpy
• Change over limit modified to 28btu/lb 75°F
A
RAH sensor
out of range
Sensor is returning a
value that is out of the
predetermined range
• Economizing functioning by OAE single
enthalpy
• Change over limit modified to 28btu/lb 75°F
• Supply power too high
• Sensor electronics failure
• Sensor element failure
A
RAH sensor
not detected
Sensor previously
installed is not detected
• Economizing functioning by OAE single enthalpy
• Change over limit modified to 28btu/lb 75°F
• Supply power missing
• Sensor electronics open
• Wire harness broken
A