Troubleshooting Guide -
Tranquility
®
Digital (DXM2) Packaged Units
Rev.: 01/15/14
14
Geothermal Heat Pump Systems
Checking Compressors
A-D
Compressor
C-S
Ohms
C-R
Ohms
Unit
ZPS20 1.64 1.30 TZ024, TE026
ZPS30 1.52 0.88 TZ036, TE038
ZPS40 1.86 0.52 TZ048, TE049
ZPS51 1.68 0.41 TZ060, TE064
ZPS60 1.85 0.34 TE072
ZPS26 1.90 1.02 TZ030
ZPS35 1.55 0.62 TZ042
Note: Readings are good ± 7%
Note: Reading S-R = C-S + C-R Readings
Example: ZPS20 S-R = 2.94 Ohms
Compressor Ohms Table
Overload opens
R
S
C
Compressor with Open Internal Overload
If both R and S are open to
common, Internal overload
is open.
R
S
C
Open run winding (infi nite)
resistance. Start winding shows
measurable resistance.
R
S
C
Note: If not, O resistance will
be close to it.
C-S and C-R will have high
resistance above 3 ohms.
Suction
Line
R
S
C
Check for ground by placing
one lead on suction line.
Compressor with Open Run Winding
Compressor with Shorted Windings Compressor Winding Shorted to Ground
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