Toshiba MMD-VN1002HEX1E Owner'S Manual Download Page 10

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Air to Air Heat Exchanger with DX Coil Unit

Owner’s Manual

Air to Air Heat Exchanger with DX Coil Unit

Owner’s Manual

– 9 –

About nighttime heat purge operation

• Nighttime heat purge is a function to reduce the

room air conditioning load in the morning in
summer by exhausting the air indoor which has
become warm while the air conditioner is
stopped in the night automatically in the Bypass
mode.

•

The nighttime heat purge operation functions if
night purge is activated and the last operation
mode of the air conditioner before stopping is

in an Air to Air Heat Exchanger

with DX Coil Unit system linked with air
conditioners.

If the

button is pushed while the system is

running, the operation lamp turns off,

appears on

the display, and the nighttime heat purge operation
turns on-standby.
After the operation becomes on-standby, the unit
automatically starts ventilation in [Low] ventilation
fan speed and [Bypass mode] when the conditions to
start the nighttime heat purge operation below are
fulfilled.
The nighttime heat purge operation is paused for one
hour if any of the conditions to pause the operation
are detected.
If the conditions to start the nighttime heat purge
operation are fulfilled one hour after the pause, the
operation will start again. If not, the operation will
remain paused for one more hour.
This cycle is repeated until the conditions to stop
(end) the nighttime heat purge operation below are
fulfilled.

NOTE

• The setting of the nighttime heat purge operation is

“OFF” As factory default.
Consult your dealer to change the setting to “ON” or
the setting of the time until the monitoring operation
starts.

• The settings of

cannot be changed during

the nighttime heat purge operation. Their indicators
are not displayed.

• The

indicator stays lit while the operation is on-

standby or paused.

• The nighttime heat purge operation cannot be

activated if 24-hour ventilation is activated.

CAUTION

The nighttime heat purge operation is not executed if the
outdoor temperature becomes about 15°C or less to
prevent condensation in the Air to Air Heat Exchanger
with DX Coil Unit, but the

indicator is still lit.

The conditions to start the nighttime heat purge
operation

The unit compares temperatures indoor and outdoor
using the monitoring operation (for about 5 minutes)
and will start the nighttime heat purge operation if the
following conditions are fulfilled.
1. A certain amount of time has passed between the

nighttime heat purge operation becoming on-
standby and the monitoring operation starting. (The
time is set between 1- 48 hours in 1 hour steps.)

2. The indoor temperature is 3°C or more higher than

the outdoor temperature and the indoor
temperature is 2°C or more higher than the
temperature set for the operation.

The conditions to pause the nighttime heat purge
operation (the operation pauses for one hour.)

1. The indoor temperature is the same or lower than

the outdoor temperature, the indoor temperature is
the same or lower than the temperature set for the
operation, or one hour has passed since the
nighttime heat purge operation started.

The conditions to stop (end) the nighttime heat
purge operation

The nighttime heat purge operation ends and the

indicator disappears if any of the following conditions
are fulfilled.
1. The air conditioner or Air to Air Heat Exchanger

with DX Coil Unit is started.

2. 48 hours has passed since the monitoring

operation started.

About humidifying

Humidifying is available during heating.

REQUIREMENT

• When the humidifying season is over, perform the

drying operation for the humidifier.
Even during humidifying season, perform the drying
operation if the unit is not used for a long period of time
(over a couple of weeks).
The drying operation must be performed in ventilation
mode for over 24 hours.
Failure to perform the drying operation may cause
residual water to rot down and emit an unpleasant
odor.

• It is required to replace the humidifying element if it

emits such an odor.

• During humidifying season, when running only this

unit while all the other air-conditioners in the room are
stopped, change the heating mode to the ventilation
mode, and stop the humidifying operation. Continuing
the humidifying operation may increase the
temperature and create condensation.

To use the Air to Air Heat Exchanger with DX Coil
Unit effectively, observe the following conditions.

* If the Air to Air Heat Exchanger with DX Coil Unit is

continuously operated beyond the conditions above,

the protective device will be activated and force the

unit to stop.

Cooling

operation

Outdoor temperature

range

-5°C to +43°C

Room temperature

range