Puregas P20KW User manual

P011238 – Rev. L
P20KW / P30KW Air Dryer
User’s Guide

PUREGAS, LLC P20KW / P30KW Air Dryer User’s Guide
Page 3 of 109 P011238 – Rev L
1. Welcome & Congratulations
Congratulations on your purchase of a new PUREGAS P20KW / P30KW Air Dryer! We
here at PUREGAS are very proud of our products and we are committed to providing you
with the best value and service possible.
We are sure that you will be satisfied with your new air dryer and would like to thank you
for choosing PUREGAS for your air dryer requirements. We also hope that you will
continue to choose us for your future air pressure and related product purchases.
For information about this and other PUREGAS products, please visit us on the web at:
www.puregas.com
2. Introduction
PLEASE READ THIS USER’S GUIDE THOROUGHLY AND SAVE FOR
FUTURE REFERENCE.
This User’s Guide is provided for the benefit of our customers and contains information
and direction specific to the PUREGAS P20KW / P30KW Air Dryer. It will cover topics
including: safety, specifications, installation, registration, operation, testing, maintenance,
replacement parts, service, and troubleshooting issues. Observation and compliance with
this User’s Guide will ensure the maximum life and efficiency of your air dryer.
This User’s Guide should be read thoroughly prior to installing, operating, or servicing
the air dryer in order to become familiar with the recommended procedures. This will
minimize the possibility of personal injury or damage to the unit due to improper
operation or handling.

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3. Table of Contents
1. Welcome & Congratulations .......................... 3
2. Introduction..................................................... 3
3. Table of Contents............................................. 4
4. Safety & Warning Information...................... 6
5. Overview & Specifications.............................. 9
5.1 Product Description .................................... 9
5.2 Key Features............................................... 9
5.3 Dryer Function Overview......................... 10
5.4 Technical Specifications........................... 12
6. Installing Your Dryer.................................... 13
6.1 Safety & Warning Information................. 13
6.2 Before You Begin..................................... 15
6.3 Included Contents..................................... 16
6.4 Required Tools and Materials................... 16
6.5 Installation Steps....................................... 17
6.6 Installation Checklist ................................ 27
7. Registering Your Dryer................................. 28
8. Operating Your Dryer .................................. 29
8.1 Safety & Warning Information................. 29
8.2 Connecting Air Lines to the Dryer ........... 30
8.3 Powering the Dryer ON & OFF................ 30
8.4 Using the Front Panel Display.................. 31
8.5 Identifying Dryer Alarms ......................... 34
8.6 Adjusting & Resetting Dryer Set Points... 38
8.7 Opening Panels......................................... 42
8.8 Connecting to Common Alarm Terminals 43
8.9 Rewiring the Common Alarm Socket....... 44
8.10 Connecting to Discrete Alarm Terminals44
8.11 Depressurizing the Dryer........................ 45
8.12 Setting the System Pressure.................... 45
8.13 Setting the Static Pressure....................... 46
8.14 Setting the Outlet Pressure...................... 47
8.15 Setting the RRU Temperature................. 48
9. Testing Your Dryer ....................................... 50
9.1 Safety & Warning Information................. 50
9.2 Measuring Compressor Amp Draw .......... 52
9.3 Measuring Voltage to Compressor ........... 53
9.4 Measuring Incoming Voltage ................... 54
9.5 Testing High Outlet Pressure Alarm......... 55
9.6 Testing Low Outlet Pressure Alarm.......... 56
9.7 Testing Low System Pressure Alarm........ 57
9.8 Testing 4-Way Valve Cycling .................. 59
9.9 Measuring 4-Way Valve Solenoid
Voltage............................................................ 62
9.10 Measuring Tower Heater Voltage........... 65
9.11 Testing Precooler Fan............................. 68
9.12 Testing Low Water Sensor Function &
System Shutdown ........................................... 69
9.13 Testing Dump Sensor and Primary
Water Dump Functions................................... 70
9.14 Testing High Water and Secondary
Water Dump Functions................................... 72
9.15 Testing Humidity Alarm and System
Shutdown........................................................ 76
9.16 Testing Power Contactor ........................ 77
9.17 Testing Fittings & Hoses for Leaks ........ 79
10. Maintaining Your Dryer............................. 80
10.1 Safety & Warning Information ............... 80
10.2 Six Month Maintenance.......................... 82
11. Replacement Parts & Accessories .............. 83
11.1 Top Front Section Parts .......................... 83
11.2 Bottom Front Section Parts..................... 84
11.3 Top Front Panel Parts ............................. 85
11.4 Top Back Section Parts........................... 86

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11.5 Bottom Back Section Parts..................... 87
11.6 Frame Section Parts................................ 88
11.7 Accessories for Your Dryer.................... 89
11.8 Ordering Parts from PUREGAS............. 90
12. Service & Repair.......................................... 91
12.1 Services Offered ..................................... 91
12.2 Initiating a Service Transaction.............. 91
13. Troubleshooting Your Dryer...................... 92
13.1 Before You Call PUREGAS................... 92
13.2 Safety & Warning Information............... 92
13.3 Air Dryer Won’t Power ON.................... 94
13.4 Display Screen Not Functioning............. 94
13.5 Low System Pressure Alarm .................. 94
13.6 Can’t Create a Low System Pressure
Alarm.............................................................. 95
13.7 High Outlet Pressure Alarm.................... 95
13.8 Can’t Create a High Pressure Alarm....... 96
13.9 Low Outlet Pressure Alarm .................... 96
13.10 Can’t Create a Low Pressure Alarm ..... 97
13.11 High Flow Rate Alarm.......................... 97
13.12 High Humidity...................................... 98
13.13 Can’t Create a High Humidity Alarm /
Shutdown........................................................ 99
13.14 High Outlet Temperature Alarm........... 99
13.15 High RRU Temperature Alarm........... 100
13.16 Low Water Alarm............................... 100
13.17 Can’t Create a Low Water Alarm....... 101
13.18 High Water Alarm .............................. 101
13.19 Can’t Create a High Water Alarm ...... 102
13.20 High Water Temperature Alarm......... 102
13.21 Compressor Doesn’t Operate.............. 103
13.22 Unit Trips Breaker .............................. 103
13.23 Contacting PUREGAS Technical
Support.......................................................... 104
14. Appendix .................................................... 105
14.1 Wiring Diagram.................................... 105
14.2 Set Point Limits and Defaults ............... 106
15. Limited Warranty Agreement.................. 107
Registration Reminder.................................. 107
16. Contacting PUREGAS .............................. 108
16.1 General.................................................. 108
16.2 Sales...................................................... 108
16.3 Service .................................................. 108
16.4 Technical Support................................. 108
17. Notes............................................................ 109

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4. Safety & Warning Information
This section contains general information about safety and warning points to consider and
adhere to during installation, operation, and maintenance of your air dryer. PLEASE
READ THIS SECTION BEFORE PERFORMING ANY OPERATION OR
PROCEDURE ON YOUR AIR DRYER.
Additional warnings specific to an operation or procedure will also be presented
throughout the following sections. These will include the symbol as well as a label of
“WARNING!”, “CAUTION!”, or “IMPORTANT!” Please be sure to pay close
attention for these warnings and read them as you encounter them.
WARNING!
For your safety, all the information in this User’s Guide must be
followed to minimize the risk of electrical shock, and prevent
property damage or personal injury.
WARNING!
Extreme care should be exercised to avoid contact with live
electrical circuits. Many procedures performed during installation,
operation, testing, and maintenance of this air dryer require the
equipment to be running, creating a situation for potential electrical
shock. It is highly recommended that you remove all jewelry before
performing any procedures.
WARNING!
Internal surfaces may be hot. Use care when coming into contact
with internal components as there is a potential for some of these
components to become hot when in operation or standby.

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CAUTION!
Depressurizing the air dryer may be necessary before performing
certain procedures. NEVER remove pressure sensing tubes from the
Control Board without depressurizing the air dryer first, or damage to
the Control Board will occur.
CAUTION!
Proper Installation & Maintenance as outlined in this User’s Guide is
extremely important to ensure the reliability and longevity of the
equipment as well as prevent damage or personal injury.
CAUTION!
This Air Dryer does not contain an internal Surge Protection Device
(SPD). If an SPD is required it must be supplied by the user.
WARNING!
High Noise. PUREGAS air dryers are meant to be installed in an
unattended area.
CAUTION!
Incoming power to Air Dryer must be:
•30 amp service recommended
•20 amp slow blow fuse
•208 - 230 VAC, 1 Phase for P20KW model
•208 - 230 VAC, 3 Phase for P30KW model
•If hard-wiring directly, minimum of 10 AWG wire must be
used

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IMPORTANT!
Performing procedures not described in this User’s Guide or installing
components not supplied by PUREGAS is NOT RECOMMENDED
AND MAY VOID THE WARRANTY.
IMPORTANT!
Performing routine maintenance as outlined in the Maintaining Your
Dryer section will ensure optimal performance over the lifecycle of
your air dryer.
CAUTION!
DO NOT USE DISTILLED OR DE-IONIZED WATER IN THIS
UNIT. It will cause damage to the compressor and other major
components over time. This unit is designed for clean tap water only.
IMPORTANT!
If installing more than one air dryer in the same location, use individual
drain tubing. If plumbed together, damage to the air dryers may occur.
CAUTION!
Observe precautions for handling Electrostatic Sensitive Devices.
IMPORTANT!
Installation of PUREGAS air dryers are intended for network
telecommunication facilities (non-customer premises) only.

PUREGAS, LLC P20KW / P30KW Air Dryer User’s Guide
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5. Overview & Specifications
5.1 Product Description
The P20KW / P30KW Air Dryer from PUREGAS is designed to intake wet ambient
air and remove the moisture for delivery to applications requiring a constant, on-
demand source of dry, pressurized air. This process is fully automatic and will
remain consistent with minimal required periodic maintenance. This dryer is
designed specifically for indoor use.
The P20KW / P30KW Air Dryer employs a fully digital operating platform offering
the most accurate readings of dryer variables, removable access panels allowing easy
access for adjustment and maintenance, heat activated desiccant towers, a
refrigeration system, and a single water sealed air compressor.
5.2 Key Features
•Real-time monitoring of over 15 points
•Remote access and alarm reset capabilities
•LCD display of all operating parameters
•Solid state microprocessor-based circuitry
•Accurate humidity sensing within ±0.1% RH
•Lowest Energy Cost
•Single water sealed compressor
•Dual pressure outlets
•Unique heated drying system
•Maintenance-free sealed cooling system

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5.3 Dryer Function Overview