Installing The Thermistors (Mm) - Mitsubishi Electric PAC-SF29LB Installationshandbuch

7. Installing the thermistors (mm)

Be sure to install the thermistors (gas and liquid) supplied with the unit as shown in the illustration.
• If the thermistors are not installed, the unit will not operate. If the thermistors are installed incorrectly, the unit will not operate properly.
Take precaution so that condensation does contact the thermistor leads or enters the electrical devices.
Before installing thermal insulation to the frame connecting points of the indoor unit, be sure to install the thermistors according to the
procedures given on this page.
Outdoor unit
Thermistor installation order
(1) Securely fasten the thermistors (liquid and gas) supplied with the unit using the thermistor holders (3, 4, 5, 6) at the fastening points of indoor
unit refrigerant pipes.
Set thermistor-L (liquid) in thermistor holders 3 or 4 and thermistor-G (gas) in thermistor holders 4, 5 or 6, and then fasten the refrigerant
•
pipes.
Refrigerant pipe
Thermistor holder
MAX. 100 mm
Liquid
ø6.35 indicated
Thermistor
ø6.35 (1/4") ø9.52 (3/8")
Caution:
• To prevent condensation from dripping on the thermistor fasteners, wrap them with sufficient thermal insulation.
• Install the thermistors so that the piping is on top (as shown in above illustration).
• Take out the thermistor lead from above the piping.
• Install the thermistors indoors.
• Route the following lead, line, and cable pairs so that they do not come into contact with each other.
- Thermistor lead and indoor unit–R-Converter transmission line
- Thermistor lead and power supply cable
- Transmission line and power supply cable
8
R-Converter unit
Controller board
Refrigerant pipe (gas)
Thermistor
The diameter of the
applicable pipe is
stamped here.
Thermistor holder
Thermistor
Band (short) 8
Caution
Fasten the thermistor lead with a band so that it does not
15-25
come off even if it is pulled.
Cut the end off the band after fastening it.
ø9.52 indicated
Gas: CN3G Liquid: CN21
Thermistor-L (liquid)
Thermistor-G (gas)
Refrigerant pipe (liquid)
∗ Select thermistor holders that match
the size of the refrigerant piping.
Indoor unit capacity
BTU
07, 09
12, 13
18
24, 30
ø9.52 indicated
ø9.52 (3/8") ø12.7 (1/2")
Flare connecting point
Indoor unit
MAX. 100
pipe size (mm)
HP Liquid Gas
1 ø6.35 ø9.52
1.6 ø6.35 ø12.7
2 ø6.35 ø15.88
2.5 ø9.52 ø15.88
Gas
ø12.7 indicated ø15.88 indicated
ø15.88 (5/8")