AquaStar AQ4 Bosch Thermotechnology Corp 50 Wentworth Avenue Londonderry, NH Tel

Models: AQ4

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50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-866-642-3198

Fax: 1-603-584-1681

www.boschpro.com

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Contents

Installation manual AQ4 Horizontal Vent KitFor Bosch AquaStar Models GWH 1600 P, GWH 1600 H For Bosch ProTankless Models GWH 425 PN, GWH 425 HNTable of Contents AQ4 Installation instructionsMaintenance Troubleshooting1 Introduction 1.1 Parts included1.2 Warnings 1.3 Preparation1.4 Requirements for installation in MassachusettsAttention residents of the Commonwealth of Massachusetts2 AQ4 Installation instructions 2.2 Locating power vent hood and clearances2.3 Power vent hood 2.1 Introduction2.4 Power vent motor 2.6 Linear safety spillage switch 2.5 Vent pipingMounting the linear safety spillage switch Connecting linear safety spillage switch to pilot safety circuit2.7.1 Models 1600P/425PN 2.7 Flow switch2.7.2 Models 1600H/425HN 3 Operation 3.1 First time start up3.1.1 Time delay relay 3.1.3 Safety interlock test5 Troubleshooting 4 Maintenance5.1 Introduction 5.4 Spark but pilot will not light 1600H and 425HN only 5.6 Noise when power vent motor is running5.5 Pilot and/or burners go out during hot water use 6 One Year Limited Warranty The Warranty TermsService Labor Costs How to Make a Claim425HN and 1600H wiring 7 Wiring diagram425PN and 1600P wiring 8 Ve n t h o o d m o u n t i n g WHEN INSTALLING THE VENT HOOD FOLLOW THE BACK DRAFT FLAPPERINSTRUCTION SHEET IF OUTDOOR TEMPERATURES MAY DROP BELOW FREEZING CUT HOLE THROUGH WALL TEMPLATEAQ4 Manual Bosch Thermotechnology Corp 50 Wentworth Avenue Londonderry, NH Tel