Flow switch, Models 1600P/425PN, Models 1600H/425HN

AQ4 Installation instructions

2.7 Flow switch

Replacement piping and flow switch is included for 1600P/425PN and 1600H/425HN water heaters. Check your model number on the right side of the water heater cover to confirm which procedure to follow.

2.7.1 Models 1600P/425PN

1.Shut off cold water supply isolation valve. If none installed, install before proceeding. Open hot water tap to relieve water pressure if water is already connected.

2.Remove and save clip on lower right side of heat exchanger.

3.Using a flat head screw driver remove and save pin from front, right side of water valve. (Fig. 8)

4.Remove copper pipe and set aside.

5.Find and connect the black flow switch to the bushing and pipes shown in Fig. 9A. Secure together with supplied clips.

6.Position flow switch and connecting pipe and bushing in place of the copper pipe that was removed.

7.Reinstall pin in water valve and clip on heat exchanger connection.

8.Connnect the three prong Molex connector cable to the flow switch.

9.Connect control cable from vent motor to Molex connector cable with wire nuts as seen in

Fig. 10.

2.7.2 Models 1600H/425HN

1.Shut off cold water supply isolation valve. If none installed, install before proceeding. Open hot water tap to relieve water pressure if water is already connected.

2.Remove and save clip on lower right side of hydrogenerator.

3.Remove and save pin from front, right side of water valve using a flat head screwdriver.

(Fig. 8)

4.Remove copper pipe and set aside.

5.Find and connect the black flow switch to the pipes shown in Fig. 9B.

Note: There are two pipes included for connection from flow switch to hydro-generator. One is slightly longer than the other. If your water heater’s serial number is greater than FD792, you

must use the longer pipe for this connection.

6.Position flow switch and connecting pipes in place of the copper pipe that was removed. Secure together with supplied clips.

7.Reinstall pin in water valve and clip on heat exchanger.

8.Connnect the three prong Molex connector cable to the flow switch.

9.Connect control cable to Molex connector cable with wire nuts as seen in Fig. 10.

Water valve pin

Pipe to heat exchanger

Fig. 8 Water valve pin

	Connection to	Brass heat
		exchanger
	water valve
		bushing

Flow switch molex connector

Replacement pipe for pilot models

Fig. 9A 1600P/425PN flow switch connections

Connection to	Connection to
hydro generator	water valve

	Replacement
	pipes for hydro	Flow switch
	models	Flow switch
	models	molex connector
		molex connector

Fig. 9B 1600H/425HN flow switch connections

Connections from	Connection from
Molex connector	vent motor (black
cable (white and	and red)
yellow)

Fig. 10 Flow switch electrical connections

AQ4 Manual

AQ4 specifications

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