Mitsubishi Electric PUHZ-W50 Installation Manual page 9

4. Electrical work
4.2. Connecting thermistor cable
Connect the thermistor 2 for the FTC controller.
4.2.1. 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>
Put TH1 on water piping (water outlet side).
Note: Be sure to attach the TH1 where it detects Flow temp.(Water
oulet side) correctly.
4.2.2. 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>
Put the TH2 on refrigerant piping (Liquid side).
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
8
TH1 TH2 TH5
Ο Х Х
Ο Ο Х
FTC
TH2:
not necessary
TH2
TB61
TH1
TH2
TB62
Wired remote controller cable
SPLIT type outdoor unit
Refrigerant LIQUID side
Outdoor unit
Refrigerant piping
Photo.4-4
Water OUTLET side
FTC
TH1
TH2
*1
Water piping