Instructions / Assembly

ManualsBrandsWestinghouse ManualsPlumbing8.1 GPM Ultra Low NOx Liquid Propane Condensing High Efficiency Outdoor Tankless Water Heater

whl-004 Rev. 000 Rel. 013 Date 5.1.18

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 10

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 18

A. General Plumbing Guidelines 18

B. Backow Preventer 18

C. Potable Expansion Tank 18

D. Piping the Water Heater 19

E. Applications 19

F. Circulator Sizing 24

G. Pressure Relief Valve 24

H. Filling the Heater 25

Part 5 - Venting 25

A. General 25

B. Approved Materials for Exhaust Vent and Intake Pipe 26

C. Additional Requirements for Installation in Canada 27

D. Exhaust Vent and Intake Pipe Location 28

E. Exhaust Vent and Intake Pipe Sizing 29

F. Tightening Water Heater Collar to Exhaust Vent and Intake Pipe 29

G. Exhaust Vent and Intake Pipe Installation 29

H. Applications 30

1. Direct Vent Installation of Exhaust and Intake 30

2. Venting Through an Existing System 33

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

I. Common Vent Piping - 199 Model Only! 35

1. Vent Diameter Sizing and Lengths 35

2. Recommended Exhaust Pipe Transitions 36

3. Two (2) Pipe Common Direct Vent Systems 36

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 47

A. Gas Pipe Sizing Tables 47

1. Gas Pipe Sizing 47

2. Natural Gas Pipe Sizing 47

3. LP (Liquid Propane) Gas Pipe Sizing 47

B. Gas Connection Requirements 47

C. Additional Precaution for Excess Flow Valve (EFV) 48

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

E. Setting and Verifying the Combustion Setting 48

Part 9 - Controls 49

A. Control and Display Overviews 49

B. Start-Up Sequence 49

C. Changing the DHW Set-Point 50

D. Changing the Temperature Indicator 50

E. Status Display 51

F. Installer Mode 52

G. Setting Up a Cascaded System 53

Part 10 - Troubleshooting 54

A. Error Code 54

B. Error Tree Analysis 57

1. Flame Detection 57

2. Air Pressure Switch Detection 57

3. Inlet / DHW / Operating Temperature / Exhaust Sensors 58

C. Suggested Corrective Actions 58

Part 11 - Installation Checklist 60

Part 12 - Maintenance 62

Part 13 - Replacement Parts 66

Limited Warranty for Tankless Water Heaters 71

Notes 73

Customer Installation Record Form 74

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, 9” 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 installer / service

technician. Have this water heater serviced / inspected annually

by a qualied installer / 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.

Vapors from ammable liquids will explode and can cause a re,

resulting in personal injury or death. The water heater has a burner

that can come on at any time and ignite vapors. DO NOT use or

store ammable liquids around the water heater.