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Installation manual
AQ4 Horizontal Vent Kit
For Bosch AquaStar Models: GWH 1600 P, GWH 1600 H
For Bosch ProTankless Models: GWH 425 PN, GWH 425 HN*
For Bosch THERM Models: 520 PN, 520 HN
WARNING: If the information in this manual is not followed
exactly, a fire or explosion may result causing property
damage, personal injury or death. Do not store or use
gasoline or other flammable vapor and liquids in the vicinity
of this or any other appliance.
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. Refer
to this manual. For assistance or additional information
consult a qualified installer, service agency or the gas
supplier.
In the Commonwealth of Massachusetts this product
must be installed by a licensed plumber or gas fitter.
Upon completion of the installation, these instructions
should be handed to the user of the appliance for future
reference.
* The GWH 425 HN has been redesigned. This vent kit
is not compatible with the older version (identified by a
white cover). Use the AQ1 horizontal vent kit with the
older version.
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Summary of Contents for Bosch AQ4
- Page 1 Installation manual AQ4 Horizontal Vent Kit For Bosch AquaStar Models: GWH 1600 P, GWH 1600 H For Bosch ProTankless Models: GWH 425 PN, GWH 425 HN* For Bosch THERM Models: 520 PN, 520 HN WARNING: If the information in this manual is not followed * The GWH 425 HN has been redesigned.
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Page 2: Table Of Contents
................3 1.2 Warnings ................3 1.3 Preparation ................3 1.4 Requirements for installation in Massachusetts ................4 2 AQ4 Installation instructions ................. 5 2.1 Introduction ................5 2.2 Locating power vent hood and clearances ................5 2.3 Power vent hood ................ -
Page 3: Introduction
• 2 - Pipe clips minimum clearance requirements. • 1 - Molex connector cable 3. When using an AQ4 the maximum vent length • 1 - Heat exchanger bushing from the water heater to the point of termination Power vent motor is 25 feet with one elbow. -
Page 4: Requirements For Installation In Massachusetts
(8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall AQ4 Manual... -
Page 5: Aq4 Installation Instructions
HVAC 1. Attach the mounting template (on page 14) contractor or gas technician. to the interior wall that the vent hood will be Please contact Bosch Water Heating with any penetrating. questions. 2. Ensure that the proposed vent termination 2.2 Locating power vent hood and... -
Page 6: Power Vent Motor
AQ4 Installation instructions 2.4 Power vent motor Caution: Power vent motor must be mounted with vibration mounts and with motor shaft horizontal to prevent motor bearing wear. 1. Remove vibration mounts, nuts and washers from parts bag. Install on power vent motor as shown in Fig. -
Page 7: Vent Piping
Fig. 5 Venting setup supplied in the power vent kit, with the exception of the 5" to 4" reducer in the AQ4 kit. Observe the clearances associated with the class of vent pipe used. 4" single wall galvanized, 4" stainless steel or 4"... -
Page 8: Flow Switch
AQ4 Installation instructions 2.7 Flow switch Water valve pin Replacement piping and flow switch is included for 1600P/425PN and 1600H/425HN water heaters. Pipe to heat Check your model number on the right side of the exchanger water heater cover to confirm which procedure to follow. -
Page 9: Operation
If not, see the 3.1.1 Time delay relay troubleshooting tips in Chapter 5. 1. The AQ4 power vent kit is equipped with a time 4. Turn off hot water tap. delay relay. It is supplied with the time delay set 5. -
Page 10: Maintenance
Consult a plumbing professional for the use of a pressure reducing valve, expansion tank or water hammer arrestor to combat this condition. Fig. 11B Improperly closed back draft flapper AQ4 Manual... -
Page 11: Pilot Will Not Hold When Lit Or Spark Automatically With Hot Water Flow
VH1-4 vent hood. Mounting the power vent motor directly on top of or close to the water heater, may result in lifting flames and pilot outages. Vent pipe length must be at least 2 feet. AQ4 Manual... -
Page 12: One Year Limited Warranty
The vent kit is warranted by the Manufacturer Any claim for warranty parts should be made (TJERNLUND) through Bosch Thermotechnology to your local dealer, distributor or to Bosch Corp. Bosch Thermotechnology will furnish a Thermotechnology. If Bosch Thermotechnology, replacement part which fails in normal use and... -
Page 13: Wiring Diagram
WIRE WIRE TIMER RELAY BLUE YELLOW FLOW SWITCH (N/O) DENOTES LINE VOLTAGE FACTORY WIRING DENOTES LOW VOLTAGE FACTORY WIRING Fig. 12 Fan wiring diagram 425HN and 1600H wiring 425PN and 1600P wiring Fig. 13 Safety circuit wiring diagram AQ4 Manual... -
Page 14: Vent Hood Template
NOTE: HARDWARE SHOWN INCLUDED WITH VENT HOOD WASHER (4) SHEET METAL SCREW (4) WHEN INSTALLING THE VENT HOOD FOLLOW THE BACK DRAFT FLAPPER INSTRUCTION SHEET IF OUTDOOR TEMPERATURES MAY DROP BELOW FREEZING Fig. 14 Vent hood mounting template AQ4 Manual... - Page 15 Notes AQ4 Manual...
- Page 16 Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel: 1-866-642-3198 Fax: 1-603-584-1681 www.bosch-climate.us BTC 718003301 C...