Control Outline - Toshiba VN-M150HE Service Manual

6

Control Outline

Air to Air Heat Exchanger
Control Specifications
NO. Item
When the power 1. If the power supply is reset during the occurrence of an error, the check code is
is reset
1
Ventilation Air to Air Heat Exchanger system and Air to Air Heat Exchanger system linked with
mode control air conditioners
1. Air to Air Heat Exchanger system
2
cleared.
If an abnormal state continues even after the unit is restarted by pressing the [ON/
OFF] button on the remote controller, the check code is redisplayed on the remote
controller.
1) Ventilation mode control
• The control method of the automatic mode is different depending on whether
it is an Air to Air Heat Exchanger system or an Air to Air Heat Exchanger
system linked with air conditioners.
• There are three ventilation modes: Automatic, Heat Exchange, and Bypass.
2) When a system without a remote controller or RBC-AMT32E, RBC-AMS41E
remote controller is used:
• The ventilation mode can be changed with CODE No. (DN) [EA] of the DN
setting.
3) Bypass mode control
• If OA RA/10 + 12.5, the system automatically runs in Heat Exchange mode
to prevent condensation. (For details, see the section "Cold Mode Control.")
• The display on the remote controller remains "Bypass" regardless of the
ventilation mode in actual operation.
• When operation starts in Bypass mode, the Heat Exchange mode is
maintained for three minutes if the state before stop is Heat Exchange mode
(cold mode control).
1) Automatic mode control
• One of the following three zones is selected by the TOA and TRA sensors:
Cooling zone, Fan zone, Heating zone
• Automatic ventilation control is performed in the Cooling and Heating zones.
• For the Fan zone, the mode is fixed to Heat Exchange.
• For five minutes after the start of Automatic mode, the Heat Exchange state is
maintained.
• The display on the remote controller remains "Automatic" regardless of the
ventilation mode in actual operation.
2) Criteria for each zone:
[Cooling zone]
OA 24°C or OA 20°C and RA
[Fan zone]
20°C OA < 24°C and 20°C
[Heating zone]
Temperature range out of the Cooling and Fan zones
3) Bypass mode condition in automatic ventilation control
[Cooling zone]
RA 26°C and OA 22°C and RA
[Heating zone]
RA 18°C and RA/10°C + 14.5°C
• If the system is in an undefined zone when operation starts, the system is
operated in Heat exchange mode. If the state moves to this zone during
operation, the previous state is retained.
Specification outline
24°C
RA < 24°C
OA + 3°C
OA 22°C and OA
17
TOA sensor
TRA sensor
CODE No. (DN)
[EA] [EC]
RA + 3°C
Remarks