Mitsubishi Electric PAC-TZ02-E, Руководство по обслуживанию

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9
OCH729
7-4. Checking component parts' function
Part Name Check Points
Water circulation pump 2/3
L N
M
1~
Mixing valve
CCW (Open)
Black
CW (Close)
Brown
N
Blue
M
1~
(1) Check if wirings are correct.
TBO.2-1: Brown
TBO.2-2: Blue
TBO.2-3: Black
(2) Remove the motor part from the mixing valve and check if it functions prop-
erly as follows:
• The motor dial rotates in a CW direction when 230 V is applied between
brown and blue.
• The motor dial rotates in a CCW direction when 230 V is applied between
black and blue.
(3) If the motor functions properly, the valve may be locked by some cause: Re-
move the valve to check for clogging inside.
Thermistors
Disconnect the connector then measure the resistance with a tester.
(At ambient temperatures of 10–30°C.)
Thermistor Normal Abnormal
THW6
4.3–9.5 kΩ Open or short
THW7
THW8
THW9
<CC: Constant curve> The circulator runs on a constant curve.
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
Temperature (
:
)
Resistance (k
"
)
<Thermistor Characteristics Charts>
• Zone1 flow water temperature thermistor (THW6)
• Zone1 return water temperature thermistor (THW7)
• Zone2 flow water temperature thermistor (THW8)
• Zone2 return water temperature thermistor (THW9)
0°C 15 kΩ
10°C 9.6 kΩ
20°C 6.3 kΩ
25°C 5.2 kΩ
30°C 4.3 kΩ
40°C 3.0 kΩ
Thermistor R0 = 15 k Ω ± 3 %
B constant = 3480 ± 2 %
Rt = 15exp {3480 ( 273+t – 273 )}
1 1
0
10
20
30
40
50
60
70
80
0 0 1 0 2 0 4 0 5 60
External static pressure [kPa]
30
Flow rate [L/min]
CC3
CC2
CC max.
CC1