WFCO WF-8900 User Manual

Operator Manual

For use with WFCO ULTRA III Distribution Center

WF-8900 Series

(model number located on the door assembly label)

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Distributed in the U.S.A. and Canada by

ARTERRA DISTRIBUTION

Sales [phone]

Warranty Service [phone]

Fax [phone]

www.wfcoelectronics.com

TM

Installation and Servicing of the WFCO WF-8900 Series Power Center

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CAUTION

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This product should be installed by an experienced technician.
CAUTION and care must be taken when servicing this equipment.

To prevent severe shock or electrocution consult your servicing dealer.
No serviceable parts.

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WARNING

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This unit employs components that tend to produce arcs or sparks.

To prevent fire or explosion, do not install in compartments

containing batteries or flammable materials

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CAUTION

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(LP gas).

To prevent fire, do not cover or obstruct ventilation openings.

Do not mount in zero-clearance compartment.

Overheating may result.

For continued protection against risk of fire, or electric shock

replace only with same type and ratings of fuse.

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CAUTION

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Check on a monthly basis the fluid level in any battery connected to RV
charging system.

This product is not ignition protected and should not be installed in an

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LP compartment.

General Consumer Information

Reverse Battery Protection
This feature prevents permanent damage to the converter from an incorrect

battery connection.

Automatic Cooling Fan
The fan is variable speed and current controlled.

Electronic Current Limiting
Automatically shuts down power during overload or short-circuit conditions.

Automatically returns to normal operation after conditions are corrected.

DC Fuses (12 Volts)

- Eleven 12 Volt circuits (including two circuits for slideouts)

- Maximum of 30 Amp fuse for DC circuits 10 and 11 (all others max. 20 A)

- Reverse battery protection fuses; replace with
ATC “Littelfuse ” Type 257 fuse

AC Circuit Breakers (120/240 Volts)

- One 30 Amp Main circuit and a maximum of five 20 Amp Branch circuits

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UL -Listed Main Circuit Breakers, rated for 120 V, maximum 30 A

Acceptable circuit breakers are as follows:

Manufacturer

Cutler Hammer
Thomas Betts
ITE/Siemens
Square D

INSTAL L ATION INSTRUCTIONS

2

Murray

UL-Listed Branch Circuit Breakers, rated for 120 V, maximum 20 A

Acceptable circuit breakers are as follows:

Manufacturer

Cutler Hammer
Thomas Betts

ITE/Siemens
Square D

Murray

A replacement or additional circuit breaker shall be of the same manufacturer,

­ type designation, and equal or greater interrupting rating, not to exceed 30 A

- “Short-Circuit-Current” rating for the breaker should be 10,000 A

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Model/Cat. No./Type

Type BR and C
Type TB or TBBD
Type QP or QT
Type HOM or HOMT
Type MP-T or MH-T

Model/Cat. No./Type

Type BR and C, Type BRD BD and A
Type TB and TBBD
Type QP or QT
Type HOM and HOMT
Type MH-T or MP-T

Converter Operation Modes

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Troubleshooting 8900 Series Power Center

All WFCO power converters are automatic three-stage switching
power supplies. The converter senses which mode it needs to be in by
checking the RV system voltage.

The three modes/stages of operation include:
Absorption mode/Normal operation

Nominal battery charge and supplies power to appliances

Bulk mode/Charge mode

Fast battery charge and supplies power to appliances

Float mode/Trickle charge

Trickle battery charge during storage

Absorption Mode: During this mode, the converter output is in the

13.6 Vdc range. This is the normal operation mode. This mode
provides the 12 Vdc and current required by the 12 Vdc RV appliances,
as well as slow charging the battery.

Bulk Mode: In this mode, the output voltage of the converter will
switch to 14.4 Vdc range for a maximum of four hours. If the converter
cycles between “Absorption and Bulk mode”, there could be a shorted
battery cell or other issues.

Float Mode: In this mode, the converter is charging the battery with a
trickle voltage of 13.2 Vdc. When the converter senses a demand (by
turning on lights), the converter automatically returns to the
“Absorption mode”.

OPERATI O N A L FEATURES

If there is no DC output, first check the reverse polarity fuses on the front
panel of the WF-8900 Series power center. Then, visually inspect the fuses
for any breaks; if none are found, use a continuity tester to check for continuity.

WF-8900 SERIES

MODEL: WF-89 xx

Model number

FUSE

+VCC

FUSE

ATC style

“Littelfuse ” Type 257 fuse

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Actual appearance of the front cover may vary.

If the reverse polarity fuses are blown, it means the RV battery was accidentally
connected in reverse, either at the battery or at the converter. Reconnect
properly, then replace the fuse with the same type and amp rating as the
original “Littelfuse ” Type 257 automotive-style fuse.

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IMPORTANT: These fuses protect the converter from damage in the event that
the RV battery is accidentally connected in reverse. A reversed battery
connection, even for a second, is the reason that these fuses will blow.

3

4

The fuse rating that the manufacturer suggests for the output fuses will be
marked on the unit. Replace only with same type and rating.

TROUBLESHOOTING INSTRUCTIONS

Breaker Filler Plates

Manufacturer

WFCO

Model/Cat. No./Type

FP-01 or FP-01B (Black)