11
7 SERIES 700A11 INSTALLATION MANUAL
To maximize the benefits of the hot water generator a
minimum 50-gallon water heater is recommended for
higher demand applications, use an 80-gallon water
heater or two 50-gallon water heaters connected in a
series as shown below. Two tanks plumbed in a series
is recommended to maximize the hot water generator
capability. Electric water heaters are recommended. Make
sure all local electrical and plumbing codes are met for
installing a hot water generator. Residential units with hot
water generators contain an internal circulator and fittings.
A water softener is recommended with hard water (greater
than 10 grains or 170 total hardness).
NOTES:
1) Using a preheat tank, as shown in Figure 12, will
maximize hot water generator capabilities. 2) The hot water
generator coil is constructed of vented double wall copper
suitable for potable water.
Figure 11: Typical Hot Water Generator Installation
CAUTION: Elements will burn out if energized dry.
Figure 12: Hot Water Generator Installation In Preheat Tank
In
Venting Waste Valve
or Vent Coupling
3/4" x 3/4"
x 1/2" tee
Cold
Water In
Hot
Water Out
P/T Relief
Valve
P/T Relief
Valve
HWG
Water In
HWG
Water Out
Drain Valve
Drain Valve
Storage
Tank
Electric Powered
Water Heater
Water Tank Preparation
To install a unit with a hot water generator, follow these
installation guidelines.
1. Turn off the power to the water heater.
2. Attach a water hose to the water tank drain connection
and run the other end of the hose to an open drain or
outdoors.
3. Close the cold water inlet valve to the water heater tank.
4. Drain the tank by opening the valve on the bottom of
the tank, then open the pressure relief valve or hot water
faucet.
5. Flush the tank by opening the cold water inlet valve to
the water heater to free the tank of sediments. Close
when draining water is clear.
6. Disconnect the garden hose and remove the drain valve
from the water heater.
7. Refer to Plumbing Installation and Hot Water Generator
Startup.
NOTE:
This configuration maximizes hot water generator
capability.
Drain Valve
In
P/T Relief
Valve
Cold
Water In
Hot
Water Out
HWG
Water In
HWG
Water Out
Venting Waste
Valve or Vent
Coupling
3/4” x 3/4” x 1/2” tee
Hot Water Generator Connections
