SCWD-QS (12/16)
Page 36
3) Voltage Verification
If it is necessary to verify the voltage output of the EPS system, it can be checked with a digital DC
voltmeter. The correct electrical voltage is listed in Figure 21.
State of system
Voltage Output
Unloaded
(Anode or Ground disconnected, alarm sounding)
20-30 V DC
Figure 21. EPS Voltage Ratings
To check the voltage
unloaded
, disconnect the Anode plug from the back of the Compressor Unit.
The EPS alarm will be heard. While the alarm is sounding, use one end of the voltmeter probe into
the EPS socket, and put the other voltmeter probe in contact with either the earth loop liquid or the
vapor line. Make sure the probe is in contact with the copper, with no insulation in the way. As an
alternative you can also use the service valve. See Figure 22. Reconnect the Anode, alarm should
stop ringing.
NOTE
: In extremely dry soil conditions (with low conductivity), the EPS system might not close the
alarm relay upon initial start-up or after an interruption in power. Resetting the alarm relay can be
done by quickly shorting the anode, positive to ground. It may be necessary to strip away part of the
anode wire insulation to do so.
Figure 22. Typical Test for DC Voltage
IMPORTANT!
DO NOT troubleshoot the EPS board! If the above steps do not resolve the
problem, call ETI for technical service assistance at 1-863-701-0096.
Summary of Contents for SCWD-024-1C
Page 15: ...SCWD QS 12 16 Page 15 Figure 7 SCWD Compressor Unit Electrical Schematic Diagram 230 1 60...
Page 16: ...SCWD QS 12 16 Page 16 Figure 8 SCWD Compressor Unit Electrical Schematic Diagram 230 3 60...
Page 17: ...SCWD QS 12 16 Page 17 Figure 9 SCWD Hydronic Heating Cooling Water Heating Sytem Application...
Page 20: ...SCWD QS 12 16 Page 20 Figure 11 SureStart Mode of Operation...
Page 31: ...SCWD QS 12 16 Page 31 Figure 14 Disassembled Plug Connector...
Page 38: ...SCWD QS 12 16 Page 38 Figure 23 SCWD Internal Flow Schematic...
Page 39: ...SCWD QS 12 16 Page 39 Figure 24 SCWD Piping...
Page 41: ...SCWD QS 12 16 Page 41 Figure 25 Evacuation of SCWD System...
Page 43: ...SCWD QS 12 16 Page 43 Figure 26 Initial Charge of SCWD System...
Page 45: ...SCWD QS 12 16 Page 45 Figure 27 Final Charge of SCWD System...
Page 48: ...SCWD QS 12 16 Page 48 Figure 31 Start Up Process...