AquaStar AQ4 Operation, First time start up, Time delay relay, Draft test, Safety interlock test

				Operation
3 Operation
				3. With the gas supply to the water heater turned
				off (see water heater manual) turn on a hot water
3.1 First time start up				tap. The power vent motor should come on. Verify
				the back-draft flapper is open and air is being
3.1.1 Time delay relay				blown out of the power vent hood. If not, see the
				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			Note: The AQ4 power vent fan motor is equipped
	at the (0.1) second position			with a 45 second post purge cycle. The fan motor
2.	If installing the AQ4 with standing pilot models			should continue to run for this length of time after
	1600P or 425PN, no adjustment is required.			the hot water flow has been shut off.
3.	If installing the AQ4 with hydro ignition models			5. Open gas supply to the water heater and follow the
	1600H or 425HN, move the adjuster on the time			lighting instructions in water heater installation
	delay to the (2) second position. (Fig. 11B)			manual.
4. To access the time delay relay, unplug powervent				3.1.2 Draft test
	and remove the electrical box cover on power vent
				1. Operate the water heater by running hot water.
	motor. (Fig. 11A)
				Check for proper combustion and ensure there
				is no spillage by holding an recently extinguished
				match or other visible smoke source in front of the
		cover		draft divertor. The smoke from the extinguished
		screw
				match should be quickly sucked into the opening
				and up the exhaust venting. If the smoke is blown
				back, there is a blockage in the vent or the vent
				motor is not operating properly.
			cover	3.1.3 Safety interlock test
				1. Open the gas supply to the water heater.
			screw
				2. Block the back draft flapper from opening from
				the outside.
				CAUTION: The metal of the back draft
	Fig. 11 Accessing the time delay relay			flapper will be hot when conducting this
				test.
				3. Turn on the hot water supply to allow the burner
				to activate. Hot flue gasses will spill from the
				draft diverter momentarily. In less than three (3)
				minutes, the linear spillage switch should trip,
				opening the the heater safety circuit and halting
				the flow of gas to the heater.
				NOTE: If spillage switch does not shut off the
				gas, check that you have made the proper safety
				circuit connections. If the switch still does not
				trip, contact Bosch Water Heating.
				4. After the burners shut off, turn off hot water
				supply and wait 2-3 minutes...then push the reset
				button on the linear spillage switch.
				5. Depending on model, light the pilot or run hot
				water and repeat Safety Interlock Test,
Fig. 11B Time delay relay positioning				(Step 1-4)
				6. Ensure back draft flapper moves freely and closes

properly once test is complete.

3.1.2 Verifying proper operation of powervent

It is important to verify proper operation of the power vent motor before commissioning the system:

1.Slowly turn on cold water supply and check for any leaks at newly installed flow switch and piping.

2.Plug power vent motor into 120VAC outlet.

AQ4 Manual