Service Manual

─ 20 ─
No. Problem Factor Corrective action
3 [When wall-mounted
type CO
2 sensor
PZ-70CSW-E is
used]
The LED display
lamps of the CO2
sensor do not
light even though
the trial operation
switch (SW2-1) on
the Lossnay circuit
board is turned ON.
CO2 sensor setting is set
incorrectly.
Check the setting.
• When the function setting (No. 66) of PZ-62DR-EA
is set to “0”, the function selection switches
(SW5-6 to SW5-8) on the Lossnay circuit board
should be: SW5-6 ON, SW5-7 OFF, SW5-8 OFF
• When the function setting (No. 66) of
PZ-62DR-EA is set to other than “0”, set it to “5”.
The connectors between the
LED circuit board (of the CO
2
sensor) and control circuit
board (of the Lossnay unit) are
disconnected.
Check the connector connections.
LED circuit board: CN100
Control circuit board: CN34
For details about the CO2 sensor PZ-70CSW-E,
see its Installation and Instruction Manual.
The lead wires connecting the
LED circuit board (of the CO
2
sensor) and control circuit
board (of the Lossnay unit) are
broken.
Measure the voltage between the pins of connec-
tor (CN100) with the trial operation switch (SW2-1)
ON. When the values shown below are detected,
the lead wires are not broken.
• Between the pins 1 and 2 of CN100, voltage is
applied in a cycle of 20-second 0 V and 10-sec-
ond 12 V DC.
• Between the pins 1 and 3 of CN100, voltage is
applied in a cycle of 20-second 0 V and 10-sec-
ond 12 V DC.
• Between the pins 1 and 4 of CN100, voltage is
applied in a cycle of 20-second 0 V and 10-sec-
ond 12 V DC.
When extending the CO2 sensor wiring cables,
check that they are properly connected.
For details about the CO2 sensor PZ-70CSW-E,
see its Installation and Instruction Manual.
LED circuit board failure If the problem persists, replace the wall-mounted
type CO
2 sensor. For details about the CO2 sensor
PZ-70CSW-E, see its Installation and Instruction Manual.
4 [When wall-mounted
type CO2 sensor
PZ-70CSW-E is
used]
CO2 concentra-
tion display of
PZ-62DR-EA does
not change even
though the number
of persons in a room
is changed.
Ventilation air volume by the
Lossnay unit is large enough or
too small against the change in
the number of persons in a room.
In this case, CO2 concentration displayed value
may be always low or high.
The lead wires connecting the
CO
2 sensor circuit board and
Lossnay control circuit board
are broken.
If the lead wire to pin 3 of the connector on the CO2
sensor circuit board is broken, detected CO2 con-
centration value may be fixed.
When extending the CO2 sensor wiring cables,
check that they are properly connected.
For details about the CO2 sensor PZ-70CSW-E,
see its Installation and Instruction Manual.
The lead wires connecting the
LED circuit board (of the CO
2
sensor) and control circuit
board (of the Lossnay unit) are
broken.
Check the connector connections.
LED circuit board: CN100
Control circuit board: CN34
When extending the CO2 sensor wiring cables,
check that they are properly connected.
For details about the CO2 sensor PZ-70CSW-E,
see its Installation and Instruction Manual.
5 The fan does not
stop even though
the remote control-
ler is operated to
stop operation.
The pre-heater or operation
monitor with delay operation is
set to be used.
If the pre-heater or operation monitor with delay oper-
ation is set to be used, the fan continues operating for
three minutes after the stop operation.
Check the function settings (No. 12 to 16) of
PZ-62DR-EA. (See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)