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Installation Dx-valve kit (Refrigerant pipe)
By the refrigerant circuit diagram, braze the sensor holder of TC1, TC2, TCJ of the valve kit and the accessory. Refer to the
below table for the pipe diameter and the pipe length to use.
Main pipe equivalent length
Total piping length (real length)
Furthest equivalent pipe length L (real length)
Furthest equivalent pipe length from the 1st branch
Furthest equivalent pipe length between outdoor unit
Max, real length of pipes connected to indoor units
Maximum equivalent between branching section
Outdoor unit - Indoor unit (Upper outdoor unit) H1
Outdoor unti - Indoor unit
Max
(Lower outdoor unit) H2
Height
Difference
Indoor unit - Indoor unit (Upper outdoor unit) H2
Indoor unit - Indoor unit (Lower outdoor unit) H2
Amount of additional Refrigerant
Dx-valve kit and connection of the pipe
• Be sure to cool the strainer and PMV valve body using a wet cloth so that the body temperature does not exceed
248°F(120°C) while brazing.
• For the connection pipe, it may vibrate during the defrosting operation. Carry out the installation work so that the
connection pipe does not break after a long-term use.
Sensor holders
• To ensure reliable operation, all Sensor holders must be fitted by brazing.
• Be careful of that the brazing material does not enter into the sensor holder when attaching the TC1, TC2 and TCJ
sensor holder.
TC1 sensor
• Install it in the collecting part of the gas header.
TC2 sensor
• Install it in the between the liquid pipe distributor and the PMV.
(TC2 sensor is attached to the refrigerant cycle of AHU.)
TCJ sensor
• Install it in the pass where the temperature of the capillary tube is the lowest.
• Keep a distance of 2" (50 mm) ± 1" (25 mm) from the end plate.
TA, TF sensor
• Install the TA, TF sensor where the better of air flow.
• The TA sensor must be located in the Return Air position, prior to mixing with any fresh air.
• Install the TF sensor in a place where the discharge air temperature is uniform.
If the TC1, TC2, or TCJ sensor are easy to be subjected to the surrounding thermal effect, cover them with the heat
insulator material, and fix them with the fixing band.
If the lead wires of various sensors are left over, protect them from the effects of external force, heat, and water, and fix
them with a fixing band. If the lead wires of various sensors do not reach, use the Optional Sensor 32'10" (10 m) cable)
TCB-IFDES1001P-UL
Gas pipe
45°
TC1 sensor holder
Braze the TC1 sensor on the location of the lower
side 45° to detect the stable temperature.
Item
H2 > 9.8 (3 m)
H2 ≤ 9.8 (3 m)
Sensor holder
TA type
ft
Same as piping length restriction of outdoor unit
656
200
427 (394)
130 (120)
131
40
Same as piping length
restriction of outdoor unit
66
20
98
30
131 (40 m) or the outdoor
unit spec. Whichever is shorter
of outdoor unit.
Refer to specification of outdoor unit
Taping
Taping
Attachment figure
After brazing the pipe, wrap the attached heat insulator and fix
it with a tape.
– 14 –
TF, DDC type
m
ft
394 (328)
120 (100)
328
-
-
-
-
131
-
-
Valve kit
Heat insulator
m
100
40
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