S-17B Ground Test; S-17C Unloader Test Procedure; Testing Crankcase Heater (Optional Item) - Daikin DAR09 Service Instructions Manual

SERVICING
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Remove the leads from the compressor terminals.
See warnings S-17 before removing compressor
terminal cover.
2. Using an ohmmeter, test continuity between terminals S-R,
C-R, and C-S, on single phase units or terminals T2, T2 and
T3, on 3 phase units.
OHMMETER
TESTING COMPRESSOR WINDINGS
If either winding does not test continuous, replace the compres-
sor.
NOTE: If an open compressor is indicated, allow ample time for
the internal overload to reset before replacing compressor.

S-17B GROUND TEST

If fuse, circuit breaker, ground fault protective device, etc., has
tripped, this is a strong indication that an electrical problem
exists and must be found and corrected. The circuit protective
device rating must be checked, and its maximum rating should
coincide with that marked on the equipment nameplate.
With the terminal protective cover in place, it is acceptable to
replace the fuse or reset the circuit breaker ONE TIME ONLY to
see if it was just a nuisance opening. If it opens again, DO NOT
continue to reset.
Disconnect all power to unit, making sure that all power legs
are open.
1. DO NOT remove protective terminal cover. Disconnect the
three leads going to the compressor terminals at the nearest
point to the compressor.
2. Identify the leads and using an ohmmeter on the R x 10,000
scale or the highest resistance scale on your ohmmeter
check the resistance between each of the three leads sepa-
rately to ground (such as an unpainted tube on the compres-
sor).
C
R
S
COMP

S-17C UNLOADER TEST PROCEDURE

A nominal 24-volt direct current coil activates the internal
unloader solenoid. The input control circuit voltage must be 18
to 28 volt ac. The coil power requirement is 20 VA. The external
electrical connection is made with a molded plug assembly. This
plug contains a full wave rectifier to supply direct current to the
unloader coil.
Unloader Test Procedure
If it is suspected that the unloader is not working, the following
methods may be used to verify operation.
64
3. If a ground is indicated, then carefully remove the compres-
sor terminal protective cover and inspect for loose leads or
insulation breaks in the lead wires.
4. If no visual problems indicated, carefully remove the leads at
the compressor terminals.
5. Carefully retest for ground, directly between compressor
terminals and ground.
6. If ground is indicated, replace the compressor. The resistance
reading should be infinity. If there is any reading on meter,
there is some continuity to ground and compressor should
be considered defective.
OHMMETER
WARNING
Damage can occur to the glass embedded terminals if
the leads are not properly removed. This can result in
terminal and hot oil discharging.
UNLOADER SOLENOID
(Molded Plug)