Runxin F79A-LCD User Manual

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Multi-functional Flow Control Valve for

Water Treatment Systems

82602（Old Model：F79A-LCD）

82602B（Old Model：F79B-LCD）

82604（Old Model：F82A-LCD）

82604B（Old Model：F82B-LCD)

82504AB (Old Model：F82AG-LCD)

82504BB（(Old Model：F82BG-LCD)

Instruction Manual

Please read this manual in details before using the valve

and keep it properly in order to consult in the future.

OWRX.466.515

China Patent No.: ZL02220153.X，

ZL200820169873.5

Questions and Answers:

H
Howard NguyenAug 21, 2025
Why is my Runxin Control Unit softener supplying hard water?
- D
  Darren CooperAug 21, 2025
  If your Runxin Control Unit softener is supplying hard water, it could be due to several reasons. First, check if the bypass valve is open or leaking and close or repair it. Ensure there is enough salt in the brine tank, maintaining the salt level above the water level. Also, the injector may be plugged, requiring cleaning or replacement. Other potential causes include insufficient water flowing into the brine tank (check refill time), a leak at the O-ring on the riser pipe (inspect the pipe and O-ring), an internal valve leak (change the valve body), incorrect regeneration cycles (reset them), a shortage of resin (add resin to the mineral tank), poor feed water quality or a blocked turbine (reduce turbidity or clean/replace the turbine), or an open adjusting bolt (close it).
J
Jonathan RodriguezAug 23, 2025
How to fix a Runxin F79A-LCD Control Unit when the softener fails to regenerate?
- A
  Ashley MeyerAug 23, 2025
  If your Runxin Control Unit softener fails to regenerate, it could be due to a few reasons. First, ensure that the unit has permanent electrical service by checking the fuse, plug, pull chain, or switch. If the power supply is okay, verify that the regeneration cycles are set correctly and reset them if necessary. If the issue persists, the controller or motor may be defective and need replacement.
P
phammatthewAug 25, 2025
Why does my Runxin F79A-LCD use too much salt?
- A
  Andrew WoodwardAug 25, 2025
  If your Runxin Control Unit is using too much salt, check the salt usage and salt setting. Also, excessive water in the brine tank can cause this issue.
K
Kenneth ThompsonAug 26, 2025
What to do if there is excessive water in the brine tank of my Runxin F79A-LCD Control Unit?
- J
  Joshua PattersonAug 27, 2025
  If you notice excessive water in the brine tank of your Runxin Control Unit, try the following: reset the refilling time to the correct duration. Check the injector and ensure there are no obstructions in the brine pipe. Clean the brine valve and brine line to remove any foreign material. If you haven't installed a safety brine valve and there's a power failure during salting, stop the water supply and restart, or install a safety brine valve in the salt tank. Finally, if you have a safety brine valve, check if it is broken and repair or replace it if needed.
M
Megan WilliamsAug 28, 2025
What to do if Runxin Control Unit softener fails to draw brine?
- O
  osbornerebeccaAug 28, 2025
  If your Runxin Control Unit softener fails to draw brine, the following could be the reasons: the line pressure might be too low, so try to increase it. The brine line might be plugged, so clean it. There could be a leak in the brine line, so replace it. The injector might be plugged, so clean or replace it. There could be an internal control leak, so replace the valve body. The drain line might be plugged, so clean the drain line flow control. The sizes of the injector and DLFC might not match the tank, so select the correct injector size and DLFC according to the P26 requirements.
D
Daisy OlsonAug 29, 2025
Why is the regeneration time not correct on my Runxin Control Unit?
- J
  jacksonmariaAug 29, 2025
  If the regeneration time on your Runxin Control Unit is not correct, check the program and reset the time of day. Also, a power failure lasting more than 3 days may cause this issue.
A
Audrey FloresAug 31, 2025
Why is there a loss of resin through the drain line in my Runxin F79A-LCD Control Unit?
- L
  Lee CamachoAug 31, 2025
  If you experience a loss of resin through the drain line of your Runxin Control Unit, it could be due to air in the water system; assure that the well system has a proper air eliminator control. It could also be caused by a broken bottom strainer, which would require a replacement. Lastly, an improperly sized drain line control could be the culprit; check for the proper drain rate.
R
Ronald ColeSep 2, 2025
Why is there pressure lost or rust in the pipe line of my Runxin Control Unit?
- J
  Jennifer YoungSep 2, 2025
  If you are experiencing pressure loss or rust in the pipeline connected to your Runxin Control Unit, it could be due to iron in the water supply pipe, which would require cleaning the pipe. Alternatively, there may be an iron mass in the softener itself; in this case, clean the valve and add a resin cleaning chemical, while also increasing the frequency of regeneration. A fouled resin bed could also be the cause; check the backwash, brine draw, and brine tank refill, and increase the frequency of regeneration and backwash time. Finally, if there is too much iron in the raw water, iron removal equipment may be needed before softening.
T
Thomas ArmstrongSep 3, 2025
Why does the Runxin F79A-LCD Control Unit cycle continuously?
- K
  Kelly PaceSep 3, 2025
  If your Runxin Control Unit control cycle runs continuously, it could be due to a breakdown in the locating signal wiring, which you should check and connect. Another cause could be a faulty controller, which would need replacing. Foreign material stuck in the driving gear could also be the reason, so remove any such material. Finally, the time of regeneration steps might have been set to zero, so check the program setting and reset it.
V
Valerie CamposSep 5, 2025
Why is there interrupted or irregular brine in my Runxin F79A-LCD Control Unit?
- N
  nbaileySep 5, 2025
  If you experience interrupted or irregular brine in your Runxin Control Unit, possible causes include water pressure that is too low or unstable (increase water pressure), a plugged or faulty injector (clean or replace injector), air in the resin tank (check and find the reason), or floccules in the resin tank during backwash (clean the floccules in the resin tank).

Runxin F79A-LCD Specifications

General

Model	F79A-LCD
Category	Control Unit
Display Type	LCD
Water Quality Monitoring	Yes
Max. Water Production Capacity	4m³/h
Power Supply	AC 100-240V, 50/60Hz
Water Temperature	5-50°C
Drain	1/2"
Water Pressure	0.15-0.6 MPa
Transformer Input	AC 100-240V, 50/60Hz
Brine Line Connector	3/8"
Riser Pipe	1.05 inch OD

Summary

Notices and Precautions

1. Product Overview

1.1. Main Application & Applicability

Details on systems where the valve is used and its suitability.

1.2. Product Characteristics

Key features and functionalities of the control valve.

1.3. Service Condition

1.4. Product Structure and Technical Parameters

1.5. Product Install

A. Install notice

Precautions and requirements before installing the control valve.

B. Device location

Recommended placement guidelines for the softener unit.

2. Basic Setting & Usage

2.1. The Function of PC Board

Explains the functions of the control valve's PC board and buttons.

2.2. Basic Setting & Usage

A. Parameter specification

Lists and defines the available control modes and parameters.

C. Usage

3. Applications

3.1. Softener Flow Chart

Visual representation of the softener's working process and regeneration cycle.

3.2. The Function and Connection of PC Board

3.3. System Configuration and Flow Rate Curve

3.4. Parameter settlement

Service Time Calculation

Formula and method for calculating service time based on water capacity.

Backwash Time Calculation

Guidance on setting backwash time based on water turbidity.

Brine & Slow Rinse Time Calculation

Formulas for calculating brine and slow rinse times.

3.5. Parameter Enquiry and Setting

Parameter Enquiry

Steps to view current parameter settings on the control valve.

Parameter Setting

Instructions for modifying various operational parameters.

3.6. Trial Running

3.7. Trouble-Shooting

Control Valve Fault

Common problems with the control valve and their solutions.

Controller Fault

Issues related to the control board and display, with troubleshooting steps.

3.8. Assembly & Parts

Valve Body Components for F79A/F79B

List of parts for F79A/F79B valve body assembly.

Valve Body Assembly for F82A/F82B Models

Parts list for F82A and F82B valve body assemblies.

Valve Body Components for F82AG/F82BG Models

Components list for F82AG and F82BG valve body assemblies.

4. Warranty Card

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