– 166 –
SPM2 (system power module)
Ｐ
２
Ｕ
−
Smoothing capacitor
N1
P1
L2
L1
+
W
V
Notes
Voltage of approximately 320-360V is charged on the both ends of 3 smoothing capacitors 330
μ
F. High voltage
(DC320-360V) is charged on the screws and terminals of SPM2.
When checking the energizing to each part of the circuits of outdoor electrical devices, disconnect the red and gray wires
which are connected from diode stack to system power module (SPM2) to prevent secondary malfunction. (Make sure to
discharge the smoothing capacitor.)
1. Switch OFF the power or unplug the power of the indoor unit.
2. After switching OFF the power, wait for 10 minutes or longer, then apply a soldering iron of 30-75W on P1 and N1
terminals on the system power module to discharge the charged voltage on the smoothing capacitor. Do not loosen or
remove the screws of SPM. If the screws are loosened, discharging cannot be performed.
3. To perform operation check of each part of the circuit, remove the receptacle of the red and gray lead wires which are
connected from diode stack to system power module.
Soldering iron
Do not use soldering iron with
transformer as the temperature fuse
inside the transformer can blow.
Apply soldering iron on P1 and N1 terminal as shown
in the drawing on the left to discharge the charged
voltage on the smoothing capacitor.
Screws on SPM are energized. Be careful not to touch with hands. Its
tightening torque and tightening method are strictly defined. Once the screw
is loosened or removed, the screw must be tightened at tightening torque of
0.8
±
0.2
N
・
m following the procedures shown in the drawing on the right.
WARNING
1
2
3
4
5
7
6
Procedures for Electrical Discharge and How to Stop Energizing the Power Circuit
Ｎ
Ｃ
Ｎ
１
２
Ｃ
Ｎ
６
Ｃ
Ｎ
１
８
ＣＮ１４
Ｃ
Ｎ
１
３
Ｃ
Ｎ
１
１
ＣＮ５
ＣＮ１０
ＣＮ９
ＣＮ８
ＣＮ１５
ＣＮ２
ＣＮ７
ＹＥＬ
ＢＬＵ
ＲＥＤ
ＢＲＮ
ＧＲＮ１
ＷＨＴ
ＢＬＫ
ＧＲＮ２
ＲＥＤ
ＷＨＴ
Smoothing capacitors
SPM2
Diode stack
Reactor
Service
switch
LD301
LD302
LD303
Self diagnosis lamps
P.W.B. (main)
Terminal boards