23
11
Forced fan
OFF
(Continued)
2) During forced fan OFF, the operation is performed depending on the met condition
1 to 3.
• Condition 3 is met
There is a possibility of condensation on the heat exchange element. Only the exhaust
fan is operated for a given time to dry the heat exchange element.
<Zone B>
The supply fan OFF and exhaust fan ON are continued for 10 minutes, the fan is
operated for 5 minutes, and then the normal operation starts. The forced fan OFF by
Zone B is invalid for 60 minutes after the normal operation starts. However, if Condition
1, 2 or 3 is met during 60 minutes, the fan is turned off forcedly.
<Zone C>
The supply fan OFF and exhaust fan ON are continued for 60 minutes, the fan is
operated for 5 minutes, and then the forced fan OFF is continued or released
depending on the temperature (TRA, TOA, TSA).
• Condition 1 or 2 is met while Condition 3 is not
The fan OFF is continued for 60 minutes, the fan is operated for 5 minutes, and then
the forced fan OFF is continued or released depending on the temperature (TRA, TOA,
TSA).
3) The cooling zone is determined as follows depending on the relation between TRA
and TOA:
1) Condition of switch to Zone A
• Zone B
ĺ
Zone A: TOA
–8 °C and TOA
TRA – 34 °C
2) Condition of switch to Zone B
• Zone A
ĺ
Zone B: TOA
–10 °C or TOA
TRA – 36 °C
• Zone C
ĺ
Zone B: TOA
–13 °C and TOA
TRA – 39 °C
3) Condition of switch to Zone C
• Zone B
ĺ
Zone C: TOA
–15 °C or TOA
TRA – 41 °C
* The current zone is maintained in Undefined zone. If the temperature enters the
undefined zone when the operation starts, the upper zone is selected.
4) Other forced fan OFF release conditions
• Operation stopped
• Trial mode
No.
Item
Specification outline
Remarks
TOA: Outdoor air temper
ature (°C)
TRA: Return air temperature (°C)
Zone A
Undefined zone
Zone B
Undefined zone
Zone C
Summary of Contents for MD-VNK802HEXE
Page 120: ...118 11Owner s Manual Excerpt ...
Page 137: ...135 12Installation Manual Excerpt ...
