S-17B Ground Test; S-17C Unloader Test Procedure - Daikin DP14UM Service Instructions Manual

SERVICING
See warnings 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 T1, T2 and T3, on 3 phase units.
Testing Compressor Windings
If either winding does not test continuous, replace the
compressor.
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. Carefully remove the compressor terminal protective
cover and inspect for loose leads or insulation breaks
in the lead wires.
18
WARNING
2. Disconnect the three leads going to the compressor
terminals at the compressor or nearest point to the
compressor.
3. Check for a ground separately between each of the
three terminals and ground (such as an unpainted
tube on the compressor). If there is any reading of
continuity to ground on the meter, the compressor
should be considered defective.
4. If ground is indicated, replace the compressor.
Damage can occur to the glass embedded terminals if
the leads are not properly removed. This can result in
terminal and hot oil discharging.
Compressor Ground Test

S-17C Unloader Test Procedure

(2 Stage Compressors Only)
A nominal 24-volt direct current coil activates the
compressor internal unloader solenoid. The input control
circuit voltage must be 18 to 28 volt ac. (remove) The
coil power requirement is 5 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. The measured DC voltage at the connectors
in the plug should be 15 to 27 volt dc.
WARNING