G
ELECTRICAL SYSTEM
G - 5
Fuses and Breakers
Breakers
The WF-8935AN ULTRA Distribution Panel w/35 Amp Power Converter was designed
to use a 30 AMP main breaker with branch circuits (Cutler-Hammer and SIEMENS are
recommended breakers). Double breakers may be used for the branch circuits. Should
a breaker become faulty replace with the same type breaker as provided by the GEM.
Use only approved circuit breakers and 12V fuses. IMPORTANT: When replacing circuit
breakers replace with the same type and rating as the original.
AC Breaker Manufacturer:
1. Main Circuit Breaker-Listed, rated 120Vac, maximum 30 A Culter-Hammer: Type BR
and C. T&B: Type TB. Siemens/ITE: Type: QP. Square D: Type: HOM
2. Branch Circuit Breaker-Listed, rated 120Vac, maximum 20 A Culter Hammer: Type
BR and C, or BRD BD and A. T &B: Type: TBBD or TB. ITE/Siemens: Type QT or QP.
Square D: Type HOM or HOMT
12 VDC Fuses
Each 12 VDC circuit in the WFCO Distribution panel was designed for a maximum
of a 20 amp Little Type 257 automotive style fuse. Should one need to be replaced,
be sure to replace it with the same type and amp rating as originally supplied by the
Airstream. Replacing it with either a higher or lower amp fuse could result in the panel
not functioning properly.
Each 12VDC circuit of the WFCO Distribution panel is provided with a LED indicator
light. Should the fuse “blow” or an open be caused the LED will light up indicating
which circuit is open and which fuse needs to be replaced.
REVERSE Polarity Fuses. The WF-8935AN is equipped with reverse polarity fuses,
Should these fuses “blow” either during the manufacturing process or while connect-
ing the batteries replace with the same type and rating fuse as originally provided with
the equipment.
The WF-8935 AN Series is not weather resistant nor designed for installation in wet
locations. The WF-8935AN Series must be protected from direct contact with water.
Automatic Microcontroller Operation
The WFCO series of 3-stage switch mode power converter are fully automatic. The
converter senses which mode it needs to be in by checking the condition of the bat-
teries. The three modes include:
Absorption Mode: During this mode the converter output is at 13.6 VDC range. This is
the mode that the converter will function at normally. This mode provides the 12 VDC
and the current required by the trailer.
Bulk Mode: When the converter senses that the battery voltage is less than 13.2 VDC
the converter will automatically go into the Bulk Mode.
Float Mode: If the RV is not being used for a period of time and the shore power has
been left plugged in, the converter will automatically go into float mode. The converter
senses if there has been any demand. If there is no activity for a period the converter
will automatically go into float mode. When the converter senses a demand by turning
on lights, the converter automatically goes into bulk mode and returns to absorption
mode.
