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Reco-Boxx ZXR / ZXA / Flat – Operation and maintenance instructions
[03/
2022 ]
9.16 Type 16: Alarm indicating that the supply T° is too low
• Conditions:
• Only with post heating or cooling option.
• Causes:
• This alarm indicates that the supply temperature (T5) is lower than 5°C. The fans are stopped for
1 minute. The alarm is configurable through the advanced setup and is disabled by default.
• Effects:
Displayed on Touchpanel
Code
Text displayed
Level
S.50
Post-heating - T° of the supply air too low
0
S.65
Supply air T° too low - Fan stopped
3
TAC control board
ALARM OUTPUT
AL dPa OUTPUT
LED ALARM
Fans
Alarm Status
/
ON
stopped
Manual reset mandatory.
9.17 Type 17: Alarm indicating hydraulic coils frost protection alert
• Conditions:
• Only with internal hydraulic post heating coil (IBA), or external heating coil (EBA).
• Causes:
• Indicates that the anti-frost protection temperature of the hydraulic coil is lower than 4°C (config-
urable through advanced setup, it is important to reduce this Setting for BAin coil if an antifreeze
is in the fluid). The 3-way valve is automatically opened at 100% for 15 minutes and the heat-
ing demand contact is closed (output SAT3 O.R.3). If the AHU is running, the alarm is sent after
2 minutes for a preheating coil and immediately for the others; if the AHU is not running, the alarm
is sent after 5 minutes.
• Effects:
Displayed on Touchpanel
Code
Text displayed
Level
A.40
Anti-freeze protection of the internal post-heater (IBA)
3
A.41
Anti-freeze protection of the waterborne post-heater (EBA+)
3
A.42
Anti-freeze protection of the waterborne post-cooler (EBA-)
3
A.43
Anti-freeze protection of the waterborne reversible coil (EBA+-)
3
TAC control board
ALARM OUTPUT
AL dPa OUTPUT
LED ALARM
Fans
Alarm Status
/
ON
stopped
Manual reset mandatory.
