Mitsubishi Electric PAC-IF021B-E Manual page 11

3
Electrical work (FTC)
3.2. Connecting thermistor cable
Connect the thermistor 2 for the FTC controller.
3.2.1. Connecting the actual fl ow water temp. thermistor (TH1)
Connect the thermistor for the actual fl ow water temp. to 1 and 2 on
the terminal block (TB61) on the FTC controller.
When the thermistor cables are too long, cut them at the
appropriate length.
Do not bind them in the FTC unit.
<Thermistor position>
Fix TH1 on water piping (water outlet side).
Note: Be sure to attach the TH1 where it detects Flow
temp.(Water oulet side) correctly.
3.2.2 Connecting the pipe temp. thermistor (TH2)
Connect the thermistor for the refrigerant pipe temp. to 3 and 4 on
the terminal block (TB61) on the FTC (PCB).
For packaged Outdoor unit : It is not necessary to connect TH2.
For split Outdoor unit : Connect TH2.
When the thermistor cables supplied with FTC are too long, cut
them to the appropriate length.
Do not bind them in the FTC unit.
<Thermistor position>
Fix the TH2 fi rmly on refrigerant piping (Liquid side) so that it can not be detached easily.
It is better to protect the thermistor with heat insulating materials not to be affected by the ambient temperature.
Note: Be sure to attach the TH2 where it detects Refrigerant piping temp. (Liquid side) correctly.
Caution:
Do not route the thermistor cables together with power cables.
The sensor part of the thermistor should be installed where user must not touch.
(It is separated by the supplementary insulation from where user may touch.)
<Thermistor position and necessity>
Outdoor unit
PACKAGED type
SPLIT type
Ο: Necessary. Connect the thermistor.
Х: Not necessary. The thermistor is not needed to connect.
PACKAGED type outdoor unit
Water OUTLET side
TH1
Outdoor unit
*1
Water piping
TH1 TH2 TH5
Ο Х Х
Ο Ο Х
SPLIT type outdoor unit
FTC
Outdoor unit
TH2:
not necessary
TH2
TB61
TH1
TH2
Photo. 3-4
TB62
Wired remote controller cable
Refrigerant LIQUID side
TH2
Refrigerant piping
Flow temp. controller
Water OUTLET side
FTC
TH1
*1
Water piping
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