Microphor LF-220 DC Toilet

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Microflush Half Gallon Toilets - Model LF-220 - DC Operated

Download the Installation/Service Manual Here : P/N 24155

NOTE: Microphor was purchased by Wabtec who has limited support for these legacy products. HOWEVER, Mullaney & Associates carries Microphor parts and has outstanding customer service.


Customer Service

If you have any questions concerning your Microphor product, please contact us:

8:AM-5:PM PST Monday-Friday

Tel: (800) 358-8280 or (707) 459-5563

Fax: (707) 459-6617, 24 hour

Website: www.microphor.com.


Microflush toilets are covered by one or more of the following U.S. patents 5245710; 4918764; 1280554; 169471 and related foreign patents.

Changes in Design

Continuing a policy of research and development, Microphor reserves the right of price, product or design change without notice or obligation.


Do Not Use products containing petroleum distillates or formaldehyde on any rubber parts.

Use only Silicone Lubricants!

Do Not Use any “Loctite” brand adhesive on any plastic or Delrin components as fumeswill cause damage to plastic parts. System vacuum breaker is not intended to be pressurized longer than a normal flushing cycle.

System vacuum breaker is not intended to be

pressurized longer than a normal flush cycle.

Flush Cycle Operation

The Model LF-220 Microflush Toilet is an electrically operated drop-through type toilet using approximately two quarts of water per flush. Wastewater is flushed from the bowl through a Hopper and drops directly into a holding tank. A Flapper valve at the bottom of the bowl holds fresh water in the bowl and seals out odors from the holding tank.

1.      When the flush lever is operated, a motor-driven cam begins to turn which opens the Flapper valve at the bottom of the bowl, allowing the wastewater to flow down into a holding tank. Simultaneously, the water solenoid valve opens, allowing fresh water to flow from the rim and rinse the bowl. The cam continues to turn and the Flapper will close again after approxi mately 4-5 seconds.

2.      After the Flapper has closed, fresh water continues to enter the bowl to a predetermined level until the Timer closes the solenoid valve. An adjustment on the Timer allows adjustment of the water level in the bowl to compensate for water pressure fluctuations. A vacuum breaker is provided as an anti-siphon device.

Flush Cycle Diagram

Microphor LF-220 Flush Cycle.png

Model LF-220 Downward Discharge (All dimensions +/- 0.5")

Microphor LF-220 Downward Discharge Diagram.png


Refer to Rough-In Dimensions

Note: This toilet is a drop-thru unit.  No horizontal waste line runs may be utilized. Contact the factory for specific application data.

Mounting Toilet

Turn toilet upside-down and place enclosed Wax Ring (P/N 27208), onto the bottom of mouting flange of the toilet hopper. Carefully turn toilet right-side up and place over the center of a standard floor discharge flange.  Press toilet down firmly and evenly to form a seal between the wax ring and the floor flange. Mount the toilet to the floor with the four Closet Screws and install Bolt Caps over the closet screws (both provided).

Electrical Connection

See Rough-In Dimensions and Exploded View. Connect 12 volt DC power source to the insulated

.25” spade connector near the Timer and Thermal Circuit Breaker: red wire to positive (+), black wire to negative (-).

Water Connection

See Rough-In Dimensions.

Connect fresh water from an angle stop to the 1/2” threaded water supply connection on the side of the bowl installing Filter Screen (P/N 29146). Take care not to cross the threads. Incoming water pressure must be between 20-50 PSI, with a minimum flow rate of 2.5 GPM at the toilet.

Ideal water pressure is 35 PSI at the toilet. Be sure water lines are free of debris before connecting water supply to toilet. Water supply to the toilet is to be 1/2” OD plumbed directly to the toilet. Do not install filter(s) in the toilet water supply line.

Water Level

Water Level

The normal water level is factory pre- set to the top of the Flapper.

Water Level Adjustment

Water Level Adjustment

Locate the timer on the bracker under the china lid. Turn Timer adjustment knob clockwise to increase water level, and counterclockwise to decrease. Do not turn past stops.

Seat Installation

Place the seat over the bowl opening, so that the mounting hinges on the seat align with the two holes in the bowl just behind the bowl opening. Insert the two seat mounting screws provided with the seat into the hinges’ holes and mounting holes in the bowl, from the top. Install washers and mounting nuts provided with the seat, from under- neath, and tighten firmly. Install screw head cover tabs or other hardware provided with the seat, per seat manufacturer’s instructions.


If the toilet is to be out of service for a period of time, spray 100% silicone on the flapper seal when the flapper is open to prevent if from becoming dry.


Shut OFF water to toilet. Flush toilet three times or until water no longer flows into the bowl. Unhook water supply at angle stop.  Empty water in line into receptacle.

Parts Diagram (Labels Below)

Microphor LF-220 Exploded Parts Diagram.png

Wiring Diagram

Microphor LF-220 Wiring Diagram.png

Parts Table

A Bowl - state color Call
B Lid - state color Call
C Mounting Bolts - state color Call
D Flush Activator Complete Assembly 95104
Switch 41983
Mounting Nut 00098
O-Ring 27232
E Timer Assembly Timer 89142*
Thermal Circuit Breaker Switch 42042
F Vacuum Breaker Assembly see Vacuum Breaker Service 33540
G Solenoid Vavle Assembly see Solenoid Valve Cleaning 89134-3
H Mounting Bracker 91022
I Hopper Assembly see Hopper

see Flapper Adjustment

Hopper Assembly without Motor 90056
Hopper Assembly with Motor Assembly 90028-3
Motor Assemlby

see Flapper Adjustment see Clevis exploded view see Wiring Schematic

Motor 41981
Cam with Set Screw 91865*
Motor with Bracker Assembly 99086
Limit Switch 41982*
J Floor Seal Wax Ring 27208
K Hopper Mounting Assembly (J-Bolts) 90899-3
L Overflow Assembly 96385
Q Spud Assembly Complete Assembly 96347
O-Ring 27224
R Water Supply Tube Complete Assembly 96392
Elbow 96387
S Water Filter Screen 92060
K I T S Flapper Replacement Kit 90066-3*
Hopper Adapter Kit 24770-3
Solenoid Valve Service Kit 40037*
Vacuum Breaker Service Kit 95037*
Silicone Lubricant 26856
Master Service Kit 94175

*Items shown with asterisk are in Master Service Kit, P/N 94175

Service Procedures

Before performing any service procedures, turn off water and electrical power to toilet.

Flapper Adjustment

LF-220 Flapper Adjustment Diagram
Adjustment Set Screw Diagram

Flapper Replacement Kit, P/N 90066-3

  1. Remove toilet from floor. Locate flapper operating linkage on the side of the hopper.
  2. Remove the clevis pin retaining ring. Remove clevis pin.
  3. Adjust as necessary by turning the 3/8” set screw inside the clevis as required, then replace the clevis pin and retaining ring. Turn clockwise to increase flapper seal tension, counterclockwise to decrease. Inspect the crank arm, clevis and clevis pin for wear; replace if required. Do not turn bolt more than three (3) complete turns.

To Change Flapper Gasket

  1. Turn water and air off.
  2. Reach behind flapper to grasp gasket tails.
  3. Pull tails out of slots to remove old gasket.
  4. Installation is the reverse of removal.
  5. Tails must be pulled all the way through to insure smooth surface.

Solenoid Valve Cleaning

Solenoid Service Kit, P/N 40037

  1. Disconnect the power by removing the two (2) blue wires from the solenoid.
  2. Disconnect the water supply line at china end.
  3. Remove two (2) screws securing the solenoid to the mounting bracket.
  4. Pull solenoid away from the Vacuum Breaker.
  5. Remove water supply line.
  6. Remove four (4) screws from Solenoid Valve Body and remove spring and diaphram.
  7. Clean holes in the diaphram if clogged. Inspect solenoid for debris and clean. Reassemble in reverse order.

12v Solenoid Diagram (Click to Enlarge)

Hopper Removal and Resealing

Hopper Replacement Kit, P/N 24770-3

1. Remove toilet from the floor. Place toilet upside down on a sheet of cardboard or other padded material.

2. Remove J-Bolts nuts from hopper sides - life the hopper off.

Hopper Diagram

3. Remove quad ring between hopper and seal adaptor. Check that the quad ring is not damaged, replace quad ring if necessary.

Vacuum Breaker Service

Vacuum Breaker Service Kit, P/N 95037

1. If water is visible at the top of the vacuum breaker during operation, apply some silicone lubricant to the underside of the white float and to the O-Ring located at the upper end of the body.

2. To disassemble the vacuum breaker, remove the snap-on cap and unscrew body from the bracket. The white float inside can now be removed.

3. No service procedures are required for the lower portion of the vacuum breaker.

Vacuum Breaker Diagram

Troubleshooting Guide

Problems Cause Remedy
Water drains from bowl Nicks or obstructions on Flapper seat Replace Flapper, Service Kit P/N 90066-3
Insufficient Flapper tension See Flapper Adjustment
Flapper seal worn or damaged Replace Flapper - Kit P/N 90066-3
Water level too high Water level control out of adjustment Turn Level Adjustment 1/8 turn at a time to raise or lower water level; Clockwise to raise, counterclockwise to lower.
Fluctuating water pressure Regulate water pressure
Timer malfunction Replace Timer - Reference Timer drawing
Water continues to run Obstruction in water Solenoid Valve Remove and inspect Solenoid Valve

-see Solenoid Valve Cleaning

Toilet continues to cycle after initial flush cycle is complete - or only partially cycles A cracked cam Replace cam

-reference Flapper Adjustment Drawing

Defective Cam Switch; switch out of adjustment Adjust or replace Cam Switch

-reference Flapper Adjustment Drawing

Defective Timer Disconnect either purple wire at limit switch. If toilet continues to cycle, the timer is defective. If the toilet stops cycling, the limit switch either is not adjusted properly or is faulty.
Water leaking on floor The hopper has been jarred loose from the bowl Reseal Hooper

-see Hopper Removal/Reseal

Defective wax ring at toilet to floor connection Replace the wax ring
Loose water supply connection at toilet Disconnect water line to toilet, add Teflon tape to threads, reconnect
No water Water turned off Turn water on
Water inlet filter screen clogged Clean water inlet filter screen
No power to valve Check for DC power at Solenoid Valve during flush cycle
Defective Timer Check Timer operation - replace if necessary
Toilet doesn't activate No power Restore power
Tripped Circuit Breaker Reset Circuit Breaker Switch. Determine cause of tripped breaker if possible before operating toilet
Disconnected wires Check all wiring connections
Water is visible at Vacuum Breaker when flushed Insufficient lubrication; Worn vacuum breaker seal Service Vacuum Breaker Kit, P/N 95037

If you have any questions or need assistance, call 800.358.8280

Changes in Design: Continuing a policy of research and development, Microphor reserves the right of price, product, or design change without notice or obligation.