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Reco-Boxx ZXR / ZXA / Flat – Operation and maintenance instructions
[03/
2022 ]
9.12 Type 12: Alarm indicating that the comfort T° is too low relative to setpoint T°
• Conditions:
• Only with post-heating option.
• Causes:
• The comfort T° setpoint cannot be reached (actual T° lower than setpoint during 15 minutes, or
30 minutes if comfort on T2 instead of T5, while post heating is at maximum.)
• Effects:
Displayed on Touchpanel
Code
Text displayed
Level
S.50
Post-heating - T° of the supply air too low
0
TAC control board
ALARM OUTPUT
AL dPa OUTPUT
LED ALARM
Fans
/
/
ON
/
Auto reset: yes
9.13 Type 13: Alarm indicating heat exchanger frost protection alert
• Conditions:
• Only with post-heating option.
• Causes:
• Frost protection is only selected with electrical pre-heating coil (KWin) or water preheating coil
(BAin) or modulating bypass. With KWin or BAin option: In certain air T conditions as meas-
ured on the exhaust airflow after heat recovery, indicating that the internal electrical KWin coil or
external hydraulic coil (BAin) has reached its limit, the TAC control can take over to guarantee the
anti-frost function.
If T° < assignment T -1,5 C for more than 5 minutes: supply and exhaust airflow reduction of
33% if airflow control or demand control and of 25%.
If pressure control mode, for 15 minutes.
• Effects:
Displayed on Touchpanel
Code
Text displayed
Level
A.10
Anti-freeze - Reduced air flows
2
TAC control board
ALARM OUTPUT
AL dPa OUTPUT
LED ALARM
Fans
/
/
ON
/
Auto reset: yes
