Installation Instructions

ManualsBrandsWestinghouse ManualsPlumbing8.2 GPM High Efficiency Liquid Propane Tankless Water Heater with Built-in Recirculation and Pump

whl-590 Rev. 003 Rel. 003 Date 3.22.18

Table of Contents

Part 1 - General Safety Information 4

A. Operation and Installation Warnings 4

B. Improper Combustion 6

C. Gas 6

D. When Servicing the Water Heating System 6

E. Water Chemistry Requirements 6

F. Freeze Protection 6

G. Water Temperature Adjustment and Scalding 7

H. High Elevation Installations 7

Part 2 - Before You Start 8

A. What’s in the Box 8

B. Optional Equipment 8

Part 3 - Prepare the Water Heater Installation 9

A. Locating the Water Heater 9

B. Leveling 10

C. Clearances for Service Access 10

D. Residential Garage and Closet Installations 10

E. Exhaust Vent and Intake Pipe 10

1. Direct Vent of Exhaust and Intake 11

2. Power Venting, Indoor Combustion Air in Conned or Unconned Space

F. Carbon Monoxide Detectors 11

G. Prevent Combustion Air Contamination 11

H. Removing a Heater from a Common Vent System 12

I. Technical Specications 13

J. Wall-Mounting 16

Part 4 - Water Piping 17

A. General Plumbing Guidelines 17

B. Backow Preventer 18

C. Potable Expansion Tank 18

D. Piping the Water Heater 18

E. Applications 18

F. Circulator Sizing 26

G. Pressure Relief Valve 27

H. Filling the Heater 28

Part 5 - Venting 28

A. General 28

B. Approved Materials for Exhaust Vent and Intake Pipe 29

C. Additional Requirements for Installation in Canada 30

D. Exhaust Vent and Intake Pipe Location 31

E. Exhaust Vent and Intake Pipe Sizing 32

F. Tightening Water Heater Collar to Exhaust Vent and Intake Pipe 32

G. Exhaust Vent and Intake Pipe Installation 32

H. Applications 33

1. Direct Vent Installation of Exhaust and Intake 33

2. Venting Through an Existing System 36

3. Power Venting, Indoor Combustion Air in Conned or Unconned Space

Part 6 - Installing the Condensate Drain 38

Part 7 - Connecting Electrical Service 39

A. Wiring 39

B. Dip Switches 39

C. Wiring a Cascaded System 40

Part 8 - Gas Connections 45

A. Gas Pipe Sizing Tables 45

1. Gas Pipe Sizing 45

2. Natural Gas Pipe Sizing 45

3. LP (Liquid Propane) Gas Pipe Sizing 45

B. Gas Connection Requirements 45

C. Additional Precaution for Excess Flow Valve (EFV) 46

D. Checking Gas Pressure at the Water Heater for Proper Operation

E. Setting and Verifying the Combustion Setting 46

Part 9 - Controls 47

A. Control and Display Overviews 47

B. Start-Up Sequence 47

C. Changing the DHW Set-Point 48

D. Changing the Time 48

E. Lock Function 48

F. Status Display 49

G. Installer Mode 50

H. Setting Up a Cascaded System 51

I. Using Recirculation Modes - Step 1 52

J. Recirculation Functions - Using Recirculation Modes - Step 2 53

1. Smart Auto-Learn Recirculation Function 54

2. Pro1, Pro2, Pro3, and PULS Recirculation Function 54

Part 10 - Troubleshooting 55

A. Error Code 55

B. Error Tree Analysis 59

1. Flame Detection 59

2. Air Pressure Switch Detection 59

3. Recirculation / Inlet / DHW / Operating Temperature / Exhaust Sensors

C. Suggested Corrective Actions 60

Part 11 - Installation Checklist 62

Part 12 - Maintenance 64

Part 13 - Replacement Parts 67

Limited Warranty for WGRGH Water Heaters 72

Notes 74

Customer Installation Record Form 75

Part 1 - General Safety Information

This water heater is approved for indoor installations only and is not

intended for use as a pool heater. Clearance to combustible materials:

0” top, bottom, sides, and back. Heater must have room for service:

24” front, 3” left and right sides, 18” top, 12” bottom, and 0” back are

minimum recommended service clearances. (A combustible door

or removable panel is acceptable front clearance. A 3” minimum

clearance must be provided from the appliance front cover to the

removable panel or combustible door.) This water heater has been

approved for closet installation and installation on combustible

ooring. Do not install directly on carpeting. Install the water heater

in a location where temperature and pressure relief valve discharge

or a leak will not result in damage to the surrounding area. If such a

location is not available, install an auxiliary catch pan. The appliance

is rated Category IV (pressurized vent, likely to form condensate in

the vent) and requires a special vent system designed for pressurized

venting. Use only Category IV vent systems.

Installer - Read all instructions in this manual before installing.

Perform steps in the given order.

User - This manual is for use only by a qualied heating installer

/ service technician. Have this water heater serviced / inspected

annually by a qualied service technician.

FAILURE TO ADHERE TO THE GUIDELINES ON THIS PAGE

CAN RESULT IN SUBSTANTIAL PROPERTY DAMAGE, SEVERE

PERSONAL INJURY, OR DEATH.

NOTE: Obey all local codes. Obtain all applicable permits before

installing the water heater.

NOTE: Install all system components and piping in such a manner

that does not reduce the performance of any re rated assembly.

A. Operation and Installation Warnings

To avoid serious injury or death, read, understand, and follow all of

the precautions listed here.