Mitsubishi Electric PUHY-200YMF-B Service Handbook page 83

b Cautions When Judging the Liquid Level
If you are judging the liquid level, be sure to use it only after making sure the liquid level sensor function (sensor and
heater) is operating normally.
1 Liquid Heater Disconnection Check
2 Liquid Heater Output Check
Turn 1 ON on the self-diagnosis switch (SW1)
signal for the heater relay to LED 7, then check the voltage of the heater
terminal (AC 198~264 V) (leave the heater connections as they are).
3 Inlet superheating is high (if normal, SH = 20 deg or lower).
c Check the refrigerant volume by self-diagnosis using the LED.
Set the self-diagnosis switch (SW1) as shown below and check the past information (history) concerning the
refrigerant volume.
Set SW1 as shown in he figure at right.
If LD8 lights up, it indicates the refrigerant charge abnormal delay state just before emergency stop due to refriger-
ant overcharge (1500).
3 Additional Refrigerant Charge Volume
At the time of shipping from the factory, the outdoor unit is charged with the amount of coolant shown in the follow-
ing table, but since no extension piping is included, please carry out additional charging on-site.
Outdoor Unit Model Name
Refrigerant Charge Volume
Calculation Formula
Calculate the additional refrigerant volume by calculating the size of the extension liquid piping and its length (units: m).
Additional Refrigerant Volume
In the calculation results, round up fractions smaller than 0.01 kg. (Example: 18.54 kg → 18.6 kg)
(α Calculation Table)
Total Capacity of
Connected Indoor Units
~90
91 ~180
181 ~370
371 ~462
Caution : (PUHY-P200·250YMF-B)
When charging with refrigerant, be sure to charge from the liquid side. If charging from the gas side, it will cause
the refrigerant composition to change inside the unit and the composition of the refrigerant remaining in the
canister will also change.
Check Items
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
PU(H)Y-200YMF-B PUHY-P200YMF-B PU(H)Y-250YMF-B PUHY-P250YMF-B
7.5kg
(kg) = (0.12 × L ) + (0.06 × L
1
α
1.0 kg
1.5
2.0
2.5
, and output the
8 kg
) + (0.024 × L ) + α
2 3
L : Length of ø12.7 liquid pipe (m)
1
L : Length of ø9.52 liquid pipe (m)
2
L : Length of ø6.35 liquid pipe (m)
3
α:
refer to the calculation table.
–81–
for PU(H)Y-(P)200·250YMF-B
Judgment
Normal if the resistance is 2 kΩ ± 5%.
Normal if AC 198~264 V is output
together with the LED lighting.
9.5kg 10 kg