INSTALLATION AND OPERATING INSTRUCTIONS FOR AQ-1 POWER VENT KIT DESIGNED FOR BOSCH 425 HN WATER HEATERS AQUASTAR 125B WATER HEATERS INCLUDING AQUASTAR MODELS: 125HX • 125BS • 125X • 125BL TABLE OF CONTENTS contents with an AQ-1 power vent mounting gas pressure switch mounting linear spillage switch common setup locating vent hood (clearances) mounting power vent motor (clearances) troubleshooting and maintenance safety interlock test AQ-1 wiring diagram vent hood template p.1 p.2 p.4 p.6 p.7 p.7 p.9 p.
AQ-1 Power vent kit Parts included: Spillage Switch Kit 1. 2. 3. 185º F linear spillage switch mounted on an angled bracket and equipped with 36 inch cables connected to one eyelet terminal and one 1/4" quick connect terminal Spillage switch mounting screw Push on male spade connector, replaces eyelet terminal from 36 inch spill switch cable. Vent Hood Kit 1. 2. 3. 4. 4" vent hood: VH1-4 Plastic wall anchors (4) Sheet metal screws (4) 5" to 4" vent reducer pipe Vibration Mount Packet 1. 2.
Before beginning installation review required clearances for Water Heater, Power Vent Motor and Vent Hood IMPORTANT: FREEZE PREVENTION TO HEATER Power Vent Kit In cold climates, ensure the proper closure of the backdraft flapper when the heater is not running. If the backdraft flapper does not close properly, cold air can enter the vent pipe and freeze the heater’s heat exchanger when not in use. Such damage is not covered under the water heater's warranty. CAUTION 1.
FIGURE B ROUTE TUBING TO PRESSURE TAP PORT ON THE HEATER'S BURNER MANIFOLD ROUTE TUBING TO BURNER 125B MODEL SHOWN AREA OR ATMOSPHERIC VENT FIGURE A MANIFOLD TAP PRESSURE TAP-GAUGE PORT (WHERE HEATER'S BURNER MANIFOLD PRESSURE CAN BE MEASURED) INSTRUCTIONS (SEE DIAGRAMS ABOVE) 1. Mount gas pressure switch by securing it to the chosen location with a screw in each one of the four mounting holes. a. Remove the brass pressure tap fitting from the burner manifold of the water heater.
Linear Spillage Sensing Switch e. Hand thread the pressure tap fitting into the heater's burner manifold. Use a small amount of an appropriate thread sealant on the male end of the fitting. Over tightening of the fitting will break it. This switch provides a means for safety shut down of the water heater in the event of flue blockage or power venter failure.
1. The ECO is mounted on the lower left outlet water pipe. (See figure C) a. Remove one lead connecting to ECO terminal, it does not matter which one is disconnected. b. Attach 1/4" quick connect terminal end of linear spill switch cable to now exposed terminal of the ECO. c. Remove the eyelet ended terminal from the other spill switch cable. Affix the push on male spade connector, which is provided with the AQ1, to this spill switch cable. d.
COMMON SETUP 4" single wall pipe* (galvanized or stainless steel) or 4" B-type vent*. 5" to 4" vent reducer pipe * Single wall vent pipe requires a 6" clearance to combustibles. B-type vent (double wall) requires a 1" clearance to combustibles. Use of B-type vent is not permissible downstream outlet side of the fan motor. Any additional vent pipe used between the fan motor and the vent hood must be positive pressure rated with all seams sealed to prevent leakage.
NOTE: FOLLOW REQUIREMENTS IN FIGURES F & G ON THIS PAGE BEFORE INSTALLING VENT HOOD, THEN USE TEMPLATE ON PAGE 13 TO CUT HOLE. "The exit terminals of mechanical vent system shall be located not less than 7 feet above grade when located adjacent to a public walkway. The venting system shall terminate at least 3 feet above any forced air inlet within 10 feet.
INSTRUCTIONS (DO NOT BEGIN THESE PROCEDURES UNTIL VENT HOOD HAS BEEN INSTALLED) 1. Remove vibration mounts, nuts and washers from parts bag. Install on power venter as shown in (Figure H). 2. To prevent vibration, securely support power venter from ceiling or joist using a plumber's strap or wire fastened to the vibration mounts. As an alternative means of support, a wall bracket may be used to support the underside of the motor. (NOTE: Plumbers strap, wire or wall bracket must be supplied by installer.
FIGURE I 3. Connect the RED wire from the jacketed cable onto the common terminal of the gas pressure switch. (See Figure I) NOTE: If the distance between the power venter and the gas pressure switch is greater than the length of the cable, splice a section of 2 conductor, PVC sheathed, 105º C thermostat cable to the supplied cable. Make sure that the colored leads remain consistent. TROUBLE-SHOOTING, MAINTENANCE AND TEST PROCEDURES 5. Combustion Air Test 1. Close all doors and windows of the building.
SAFETY INTERLOCK TEST 1. Open the gas supply to the water heater. 5. 2. Remove the vent pipe from the vent connector on the top of the water heater. TROUBLESHOOTING THE POWER VENTER 3. Block the vent connector with sheet metal or other noncombustible material. 4. Turn on the hot water supply to allow the burner to activate. Hot flue gasses will spill from the draft diverter momentarily.
S A F E TY I N T E R L O C K D I A G R A M LINEAR LIMIT SPILLAGE SENSING HEATER SWITCH ECO BLACK 185º MANUAL RESET 11
1. 2. 3. Attach this template to the interior of the wall the Vent Hood will be penetrating. Insure that proposed vent termination clearances are met before cutting opening through wall. Using a 1/2" drill bit, drill two pilot holes where noted on this template. The drill bit must be long enough to penetrate to the building exterior. Attach this template to the building exterior aligning the pilot holes on the template with 4. 5. 6. the pilot holes drilled in step 2.
