S-15A Resistance Check - Daikin DBG Series Service Instructions Manual

SERVICING
These capacitors have a 15,000 ohm, 2 watt resistor wired
across its terminals. The object of the resistor is to discharge
the capacitor under certain operating conditions, rather than
having it discharge across the closing of the contacts within
the switching device such as the Start Relay, and to reduce
the chance of shock to the servicer. See the Servicing Section
for specific information concerning capacitors.
RELAY, START
A potential or voltage type relay is used to take the start ca-
pacitor out of the circuit once the motor comes up to speed.
This type of relay is position sensitive. The normally closed
contacts are wired in series with the start capacitor and the
relay holding coil is wired parallel with the start winding. As the
motor starts and comes up to speed, the increase in voltage
across the start winding will energize the start relay holding
coil and open the contacts to the start capacitor.
Two quick ways to test a capacitor are a resistance and a
capacitance check.

S-15A RESISTANCE CHECK

HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing this unit. Multiple power
sources may be present. Failure to do so
may cause property damage, personal injury
or death.
1. Discharge capacitor and remove wire leads.
WARNING
Discharge capacitor through a 20 to 30 OHM
resistor before handling.
30
OHMMETER
TESTING CAPACITOR RESISTANCE
2. Set an ohmmeter on its highest ohm scale and connect
the leads to the capacitor -
a. Good Condition - indicator swings to zero and
slowly returns to infinity. (Start capacitor with bleed
resistor will not return to infinity. It will still read the
resistance of the resistor).
b. Shorted - indicator swings to zero and stops there
-replace.
c. Open - no reading - replace. (Start capacitor would
read resistor resistance.)
CAPACITOR