Instructions / Assembly

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

WHL-590 REV. 7.27.16

3. Screen Installation ..................................................................................................................................................................... 22

4. Power Vent, Indoor Combustion Air Installation in Confined or Unconfined Space ........................................................... 23

PART 6 – INSTALL THE CONDENSATE DRAIN ..................................................................................................................... 25

PART 7 – GAS PIPING .............................................................................................................................................................. 25

A. GAS PIPE SIZING TABLES ..................................................................................................................................................... 25

1. Gas Pipe Sizing .......................................................................................................................................................................... 25

2. Natural Gas Pipe Sizing ............................................................................................................................................................ 25

3. LP (Liquid Propane) Gas Pipe Sizing ....................................................................................................................................... 26

B. GAS CONNECTION REQUIREMENTS ................................................................................................................................... 26

C. ADDITIONAL PRECAUTION FOR EXCESS FLOW VALVE (EFV) ......................................................................................... 28

D. ADJUSTING GAS PRESSURE AT THE WATER HEATER ..................................................................................................... 28

E. SETTING AND VERIFYING THE COMBUSTION SETTING ................................................................................................... 28

PART 8 – WATER PIPING ........................................................................................................................................................ 29

A. GENERAL PLUMBING CONNECTION GUIDELINES ............................................................................................................. 29

B. INSTALL A BACKFLOW PREVENTER .................................................................................................................................... 30

C. PIPING THE WATER HEATER ................................................................................................................................................ 30

D. APPLICATIONS ....................................................................................................................................................................... 30

E. CIRCULATOR SIZING ............................................................................................................................................................. 39

F. PRESSURE RELIEF VALVE .................................................................................................................................................... 40

PART 9 – CONNECT ELECTRICAL POWER / INITIAL STARTUP ......................................................................................... 40

A. WIRING INFORMATION .......................................................................................................................................................... 41

B. DIP SWITCHES ........................................................................................................................................................................ 41

PART 10 – OPERATING SYSTEM INSTRUCTIONS ................................................................................................................ 47

A. CONTROL PANEL ................................................................................................................................................................... 47

B. LCD DISPLAY DESCRIPTIONS .............................................................................................................................................. 47

C. START-UP SEQUENCE .......................................................................................................................................................... 47

D. CHANGING THE DHW SET-POINT ........................................................................................................................................ 48

E. CHANGING THE TIME ............................................................................................................................................................. 49

F. STATUS DISPLAY.................................................................................................................................................................... 49

G. INSTALLER MODE .................................................................................................................................................................. 50

H. USING RECIRCULATION MODES – STEP 1 ......................................................................................................................... 52

I. RECIRCULATION FUNCTIONS – USING RECIRCULATION MODES – STEP 2 .................................................................... 53

1. Smart Auto-Learn Recirculation Function ............................................................................................................................... 54

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

J. ERROR MODE ......................................................................................................................................................................... 55

K. ERROR TREE ANALYSIS ........................................................................................................................................................ 59

1. FLAME DETECTION ................................................................................................................................................................... 59

2. GAS DETECTION ....................................................................................................................................................................... 59

3. AIR PRESSURE SWITCH ........................................................................................................................................................... 60

4. Recirculation / Inlet / DHW / Operating Temperature / Exhaust SENSORS .......................................................................... 60

PART 11 – FINAL INSTALLATION CHECKLIST ..................................................................................................................... 61