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PSD-QS (02/16) Page 31
2) EPS Operation and Service
Reference Figure 21 for the EPS components in the compressor unit electric box.
Figure 21. Electric Box with EPS Components
With power ON , and viewing the EPS Module in the compressor unit electric box, the EPS green
light should be illuminated, indicating there is power to the EPS system.
If the yellow light is illuminated, there is an opening in the earth loop electrical circuit. The audible
signal will also be heard. After shutting power OFF , all electrical connections from the EPS module to
the earth loop system should be checked and adjusted as appropriate to ensure good electrical
contact.
If the red light is illuminated, there is a short in the earth loop electrical circuit. The audible signal
will be heard. Check and correct all wiring and connection as appropriate from the EPS module to the
earth loop to ensure they are not shorting.
If none of the lights are illuminated, check and replace, as appropriate, the fuse for the EPS Power
Supply as shown in Figure 21. For service purposes, a spare fuse has been factory supplied and is
located in the electrical box. The replacement fuse is
Littlefuse 213 Series Slo-Blo
®
rated at 250
Volts, 2 Amperes, P/N 0213002MXP. This is also Allied Electronics Stock Number R1090710.
If it is necessary to operate the heating and cooling system while the EPS is down for service, the
EPS power may be temporarily disengaged to eliminate the audible alarm, by removing the EPS Fuse
shown in Figure 21. Upon completion of servicing the EPS, replace the fuse to energize the EPS
system and maintain warranty coverage.
IMPORTANT!
DO NOT troubleshoot the EPS power supply or EPS module! If the above
steps do not resolve the problem, call ETI for technical service assistance at 1-
863-701-0096.