Pentair PAC4 Service Manual
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Pentair PAC4 Service Manual

Whole house water softening systems 1.0, 1.5, 2.0
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WHOLE HOUSE WATER SOFTENING SYSTEMS
1.0, 1.5, 2.0
SERVICE MANUAL

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  • Page 1 WHOLE HOUSE WATER SOFTENING SYSTEMS 1.0, 1.5, 2.0 SERVICE MANUAL...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS System Information ............................3 Application Limitations ..........................4 Maintenance Requirements ..........................4 Pre-Installation Instructions ..........................4 Installation Instructions ..........................5-7 Control Information ............................8 Programming the Control ........................9-12 Understanding the Diagnostic Level ......................13 Start Up Instructions ..........................14 Sanitizing the Softener ..........................14 Exploded Views and Parts Lists ......................15-21 Troubleshooting Guide ..........................22-24 Warranty Information ..........................25...

  • Page 3: System Information

    SERVICE FLOW RATE LOW SALT MEDIUM SALT HIGH SALT (GRAINS/LB. OF REGENERATION (LBS) (GAL/MIN) RATE (GAL/MIN) SETTING(GRAINS) SETTING(GRAINS) SETTING(GRAINS) SALT) PENTAIR WATER 11.6 3.9 - 15.6 17500 25200 33500 4487 SOFTENING SYSTEM 1.0 PENTAIR WATER 11.9 5.2 - 23.4 24300 37000...

  • Page 4: Application Limitations

    APPLICATION LIMITATIONS • This system may be applied on municipality or well water systems. On hardness levels of 60 grains and higher, the system may not achieve a hardness of less than 1 grain, due to high Total Dissolved Solids. (Some bleed through is possible.) Bleed through can also be caused by Sodium levels higher than 1000 ppm.

  • Page 5: Installation Instructions

    INSTALLATION INSTRUCTIONS 1. SAFETY PRECAUTIONS • To prevent accident or injury, do not hoist the unit over your shoulder. Use a hand truck to transport the unit. Note: Do not lay the unit on its side during transportation and/or installation. •...
  • Page 6 • In some homes, metal piping may serve as a ground connection for the home electrical system. Installing a Pentair Softener with its nonmetallic valve body will interrupt the ground connection. Whenever a system is installed on metallic plumbing, we recommend you use grounding pipe clamps and a ground cable to maintain continuity of the ground connection from the inlet to the outlet pipe.
  • Page 7 Special Attention for situations where a Filter and a Softener are installed together: When a whole house filter and a softener are installed side by side, the preferred approach is to run a separate drain line from each unit all the way to the point of termination. If this is not done, there is the potential for drain water from the filter to back feed through the softener and overfill the brine tank, especially when drain lines are run overhead.

  • Page 8: Control Information

    CONTROL INFORMATION POWER ON LED A green LED is ON when power is applied to the control and the microprocessor is operating properly. SERVICE REQUIRED If the message “For Service Call” or “Service Required” displays in the window of the control without showing the time of day, the control valve has encountered a problem, such as failure to reach the proper position during regeneration.

  • Page 9: Programming The Control

    HOW TO PROGRAM THE INSTALLER’S LEVEL KEY BUTTONS: SCROLL BUTTON UP ARROW POWER POWER DOWN ARROW To begin, verify that the control is in the Service Mode. Time of Day GL Remaining • Press the DOWN ARROW and hold it for 5 seconds; the control will display: System Check •...
  • Page 10 3. SALT LEVEL The control will display: Salt Level: Med • Press the UP or DOWN ARROW to select Low, Medium, or High. Medium is a good setting for most circumstances. For small families and low hardness, Low will provide greater salt efficiency. For large families and high hardness, High will provide the most capacity.
  • Page 11 ADVANCED MENU 1. RESET AVERAGE The control will display: Reset Average No • If you want to reset the average daily volume, press the UP or DOWN ARROW to select YES. •If YES is selected, the control will reset the average volume per day to 25 % of the capacity. Press the SCROLL BUTTON to advance to the next setting.
  • Page 12 Press the SCROLL BUTTON to advance to the next setting. 5. CYCLE 1 - BACKWASH The control will display: Backwash: 10 min 6. CYCLE 2 - BRINE/SLOW RINSE The control will display: BRN/RNS: 74 min Press the Up or Down ARROW to change the length of the brine/slow rinse cycle. The minimum length is preselected based on unit size and salt level, and cannot be reduced.

  • Page 13: Understanding The Diagnostic Level

    UNDERSTANDING THE DIAGNOSTIC LEVEL To begin, verify that the control is in the Service Mode. Time of Day GL Remaining • Press the UP ARROW and hold it for 5 seconds; the control will display: Regen _ Days Ago The control is now in the Diagnostic Level. Use the SCROLL BUTTON to advance to each diagnostic. If no button is pressed within 5 minutes, the display will return to the Service Mode.

  • Page 14: Start Up Instructions

    SYSTEM START UP INSTRUCTIONS 1. Confirm the system is plumbed in correctly: inlet on left, outlet on right. 2. DO NOT add salt yet. If you made any mistakes, make the necessary corrections before continuing with the startup procedure. 3. When turning the water back on to the house, leave system in bypass mode. Then turn water on to house and check for leaks.

  • Page 15: Exploded Views And Parts Lists

    VALVE EXPLODED VIEW...
  • Page 16 VALVE PARTS LIST ITEM QUANTITY PART # DESCRIPTION 70793 3/4” NPTF TO 1/2” I.D. HOSE MALE DRAIN ELBOW 75053 BACKWASH FLOW CONTROL 2.5 GPM (UNIT SIZE 1.0 & 1.5) 72175 BACKWASH FLOW CONTROL 3.5 GPM (UNIT SIZE 2.0) 72678 SCREW 1/4-20 X 1-1/4 LG HEX WASHER HD 71083 VALVE BODY COVER 70658...
  • Page 17 CONTROL EXPLODED VIEW...
  • Page 18 CONTROL PARTS LIST ITEM QUANTITY PART # DESCRIPTION 39497 FRONT COVER ASSY, PENTAIR ROTARY 38751 BOARD ASSY SOFTENER WITH 2 LINE DISPLAY 70618 SCREW #4-24 X 3/8 LG SELF-THREADING 72519 FLOW METER SENSOR CABLE NGC 72134 HEYCO BUSHING, SR 5P-4...
  • Page 19 BYPASS VALVE EXPLODED VIEW AND PARTS LIST BYPASS VALVE ASSEMBLY PART NUMBER 72668 ITEM QUANTITY PART # DESCRIPTION 72599 SCREW 6X32X1/2 TYPE 72580 BYPASS END CAP 541 13328 017 O-RING 8730 72584 RETAINING RING VS-15 71161 568-363 NUT, BYPASS VALVE 71162 568-364 RING, NUT RETAINER 71110...
  • Page 20 QUANTITY PART # DESCRIPTION 38571 BRINE TANK BLACK 18X33 ASSY 38946 10” PENTAIR PRINTED TANK COLLAR 1.0 & 1.5 38947 12” PENTAIR PRINTED TANK COLLAR 2.0 38256 10 X 44 TANK BLACK W/BASE 1.0 38257 10 X 54 TANK BLACK W/BASE 1.5 38258 12 X 48 TANK BLACK W/BASE 2.0...
  • Page 21 Tank Size DIM A DIM B DIM C 10-1/4 in 10x44 46 in 51 in 10-1/4 in 55-7/8 in 61-1/4 in 10x54 55-1/4 in 12x48 12 in 50 in 3 in 8 3/4 in 14 1/2 in 4 3/4 in DIM A DIM C DIM B...

  • Page 22: Troubleshooting Guide

    TROUBLESHOOTING GUIDE SYMPTOM CAUSE SOLUTION 1. Hard (untreated) 1. Open bypass valve. 1. Close the bypass valve. water to service 2. Loss of resin. 2. Refer to SYMPTOM #9. 3. The valve is in regeneration. 3. Wait for the regeneration to complete. 4.
  • Page 23 TROUBLESHOOTING GUIDE SYMPTOM CAUSE SOLUTION 3. The valve fails to 1. Low operating pressure. 1. Verify the operating pressure (20 psi min.). draw brine 2. The injector is plugged. 2. Clean the injector. 3. The injector filter is plugged. 3. Clean the injector filter. 4.
  • Page 24 TROUBLESHOOTING GUIDE SYMPTOM CAUSE SOLUTION 7. The unit uses too 1. Excessive water in the brine tank. 1. Refer to SYMPTOM #5. much salt 2. The unit regenerates too frequently. 2. Check the hardness, salt, reserve capacity and calendar override settings. 8.
  • Page 25 Procedure for Obtaining Limited Warranty Coverage In order to obtain the benefits of this Limited Warranty, defective part(s) and/or product(s) must be returned to Pentair as soon as possible after discovery of the defect, but not later than the expiration date of the warranty period provided in this Limited Warranty.
  • Page 26 Notes...
  • Page 27 Notes...
  • Page 28 ©2020 Pentair Residential Filtration, LLC. All rights reserved. § For a detailed list of where Pentair trademarks are registered, please visit PENTAIR.COM/brands. Pentair trademarks and logos are owned by Pentair plc or its affiliates. Third party registered and unregistered trademarks and logos are the property of their respective owners.

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