WFCO WF-9900 User Manual

Operator Manual

For use with WFCO ULTRA III Power Center

WF-9900 Series

(model number located on the door assembly label)

TM

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

ARTERRA Distribution

Sales [phone]

Warranty Service [phone]

Fax [phone]

www.wfcoelectronics.com

Installation and Servicing of the WFCO WF-9900 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).

For continued protection against risk of fire, or electric shock

replace only with same type and ratings of fuse.

TM

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)

- Eighteen 12 Volt circuits; circuits 1 thru 15 rated at 20 amps max. and
circuits 16 thru 18 rated at 30 amps max. Circuits 16 thru 18
recommended for slideout use.

- Reverse battery protection fuses; replace with

®

ATC “Littelfuse ” Type 257 fuse or equivalent.

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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.

AC Circuit Breakers (120/240 Volts) UL Listed

Max. Main Circuit Breaker Size: 50 Amp two pole or
Equivalent. Note: Use only 2-pole circuit breakers for Main Circuit
breaker.

Manufacturer:

EATO N

ITE/Siemens
Square D
Murray

INSTAL L ATION INSTRUCTIONS

2

Max. Branch Circuit Breaker Size: 20 Amp or 20 Amp Two Pole

Manufacturer:

EATO N

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.
For Breaker tightening torque ratings, refer to Circuit breaker.
For Neutral and Ground terminal bar torque and wire size refer to the
label on the door .assembly

Breaker Filler Plates:

Manufacturer:

WFCO

Model/Cat. No./Type:

Type BR
Type QP or QT
Type HOM
Type MH or MP

Model/Cat. No./Type:

Type BRD
Type QP or QT
Type HOMT
Type MHT or MPT

Model/Cat. No./Type

FP-01 or FP-01B

Converter Operation Modes

TM

TM

Troubleshooting 9900 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-9900 Series power center. Then, visually inspect the fuses
for any breaks; if none are found, use a continuity tester to check for continuity.

WF-9900 SERIES

MODEL: WF-89 xx

Model number

FUSE

+VCC

FUSE

ATC style

“Littelfuse ” Type 257 fuse

®

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 enough to cause the fuse to blow.

3

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

TROUBLESHOOTING INSTRUCTIONS

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