WaterFurnace 7 Series - Manual (Page 11)

11
7 SERIES 50Hz 700A11 INSTALLATION MANUAL
To maximize the benefits of the hot water generator a
minimum 189-liter water heater is recommended for higher
demand applications, use an 302.8-liter water heater or
two 189-liter 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
19.1mm x 19.1mm x
12.7mm 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
19.1mm x 19.1mm x 12.7mm tee
Hot Water Generator Connections