26
ENG
MC DUCT +03U400025 - rel. 4 - 20201201
3
• Check DDC signal
• Check DDC wiring & polarity
• Check that DDC signal is isolated
• Check impedance of DDC input
• Check controller input, replace controller if bad
4
• Check sensor wiring
• Check sensor, clean or replace
• Check controller input, replace controller if bad
5
• Check sensor wiring
• Check sensor, clean or replace
• Check controller input, replace controller if bad
6
• On loss of air flow, system shuts down. System will
restart when air flow is restored.
• Check air flow switch, adjust
• Check wiring - switch should open on air flow loss
• Check digital input on controller, replace controller
if bad
7
Compressor has failed. System will not operate.
• Consult compressor manuals and contact
compressor technical support
8
Water treatment system has failed. System will not
operate.
• Consult water treatment manuals and contact
water treatment technical support
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