Electrolux Plumbing Applications for Tankless Water Heater

12. Plumbing Applications

Recirculation System

Electrolux			Hot Water Return
	Cold Water Supply
Condensing
Tankless Gas
Water Heater			Fixtures
			Expansion Tank
Isolation			(Install according
Kit(*4)			to local code)
	Gas Supply
	Aquastat(*3)		Globe
			Valve
	Pump Control Signal(*2)		Pump(*1)
Relay for Pump
(if larger than 85 Watts)		Optional 8-10 Gallon
		Storage Tank
		(To alleviate cold water sandwich)
Hot Water

Notes:

1.Size the pump to provide a maximum of 2 GPM (7.5 L/min.) through the system at 10 ft (3m) of head plus piping losses.

Adjust the flow using a globe valve and verify the flow rate with the maintenance monitors.

2.Pump Control Signal is the preferred method to control the recirculation pump.

For pumps larger than 85W, a relay connection must be used. If the Pump Control Signal is not used, an Aquastat may be used to control the pump.

3.Use an Aquastat if the water heater is not controlling the pump.

Set the Aquastat to 10°F (5°C) below the set output temperature.

4.Electrolux recommends the use of an Isolation Kit with the installation.

These kits include an integrated shut-off and service valve with unions and a pressure relief valve.

105

Pump

R

120VAC

B S

W

Neutral

Ground

Live

Aquastat Wiring

Use Honeywell Aquastat (Model L6006A or L6006C)

Combination Potable Water and Space Heating System

			Notes:
			1. Electrolux recommends the use of an Isolation Kit with
			the installation.
			These kits include an integrated shut-off and service
			valve with unions and a pressure relief valve.
			2. Size the pump to provide a maximum of 3 GPM
		Air Handler	(11.3 L/min.) with a head pressure equal to the loss
			through the water heater and Air Handler.
	Electrolux
			3. Check valve required if it is not included with the pump.
	Condensing
			4. Set the flow	switch to deactivate the	Air Handler when
	Tankless Gas
	Water Heater		the domestic hot water flow reaches 3 GPM (11.3 L/min.).
			Adjust as necessary to prevent cycling.
			5. If the system requires water for space heating at a higher
			temperature than for other uses, means such as a
			mixing valve shall be provided to temper the water for
			the other uses to help prevent scalding.
	Pump(*2)		6. Expansion tank required if a backflow preventer is installed.
Isolation			7. The water heater cannot be used for space heating
Kit(*1)	Check		applications only.
	Valve(*3)
	Gas Supply
			Flow Switch(*4)	Backflow Preventer
				(optional)	Cold Water
			Optional		Supply
			Expansion Tank(*6)
			Mixing Valve(*5)
	Hot Water				Fixtures