Trane IntelliPak SCRF 25, Инструкция по установке, эксплуатации и обслуживанию, Страница: 106 / 120

106 SCXF-SVX01Q-EN
Category Diagnostic
Reset
Required
(PAR) An automatic reset occurs after communication has been restored.
L
Low Air Temperature Limit Trip
Problem
The low air temp limit has tripped. (Units with steam or hot water heating, or air handlers with chilled water cooling)
Reason for
Diagnostic
A low air temp limit trip is detected continuously for more than one second. This can occur if the hydronic heat low air temp limit
input closes for > 1 second, or if the chilled water low air temp limit trip input opens for > 1 second. On units with both hydronic
heat and chilled water, both low air temp limit inputs are active, and the unit will respond in the same manner regardless of
which input is used.
Controls
Reaction
The UCM will initiate the following actions:
• An “open all water valves” request is issued to the heat module function, causing any steam, hot water, or chilled water
valves on the unit to open.
• An “all heat off” request is issued to the heat control function.
• A “fan off” request is sent to the supply fan control function.
• A “close damper” request is sent to the economizer actuator control function.
Reset
Required
(PMR) A manual reset is required after the low air temp limit trip condition clears. The diagnostic can be reset at the unit
mounted human interface, by Tracer Summit, or by cycling power to the RTM.
Low Pressure Control Open—Circuit 1, 2, 3, or 4
Problem
The Low Pressure Control (LPC) for Ckt #1, 2, 3, or 4 is open.
Check
State of refrigerant charge for ckt #1, 2, 3, or 4.
Reason for
Diagnostic
The Ckt # 1 LPC input is detected open as described in the compressor protection function.
Controls
Reaction
A “Lockout Ckt # 1, 2, 3, or 4” request is issued to the compressor staging control function.
Reset
Required
(PMR) A manual reset is required anytime after the diagnostic is set. The diagnostic can be reset by the human interface, Tracer
Summit, or by cycling power to the RTM.
M
Manual Reset SA Static Press Limit
Problem
The supply air static pressure went too high for the third consecutive time.
Reason for
Diagnostic
The auto reset supply air static pressure limit diagnostic has occurred for the third time while the unit is operating in occupied
mode.
Reaction
A “supply air pressure shutdown” signal is sent to the following functions;
• Compressor staging control,
• Economizer actuator control,
• Heat operation,
• Supply fan control,
• VFD control,
• Exhaust fan control
• Exhaust actuator control
Reset
Required
(PMR) A manual reset is required and can be accomplished at the HI, Tracer Summit, or by cycling power to the RTM.
MCM Communications Failure
Problem The RTM has lost communication with the MCM.
Check
Check field/unit wiring between RTM and MCM.
Reason for
Diagnostic
The RTM has lost communications with the MCM.
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