WaterFurnace Envision2 - Manual (Page 15)

15
ENVISION 2 COMPACT INSTALLATION MANUAL
The heat reclaiming hot water generator coil is of vented
double-wall copper construction and is suitable for
potable water.
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. Electric water heaters are recommended.
Make sure all local electrical and plumbing codes are met
for installing a hot water generator. A water softener is
recommended with hard water (greater than 10 grains or
170 total hardness).
Typical Hot Water Generator Installation
Drain Valve
In
P/T Relief
Valve
Cold
Water In
Hot
Water Out
HWG
Water In
HWG
Water Out
Ball Valve
3/4 in. x 3/4 in. x 1/2 in. Tee
Vent
Field Installed
HWG Pump
Hot Water Generator Connections
CAUTION: Elements will burn out if energized dry.
Hot Water Generator Installation In Preheat Tank
In
Ball Valve
3/4 in. x 3/4 in. x 1/2 in. Tee
Cold
Water In
Hot
Water Out
P/T Relief
Valve
P/T Relief
Valve
HWG
Water In
HWG
Water Out
Drain Valve
Vent
Field Installed
HWG Pump
NOTE: This configuration maximizes hot water
generator capability.
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.
Plumbing Installation
1. Inspect the dip tube in the water heater cold inlet
for a check valve. If a check valve is present it must
be removed or damage to the hot water generator
circulator will occur.
2. Remove drain valve and fitting.
3. Thread the 3/4-inch NPT x 3-1/2-inch brass nipple into
the water heater drain port.
4. Attach the center port of the 3/4-inch FPT tee to the
opposite end of the brass nipple.
5. Attach the 1/2-inch copper to 3/4-inch NPT adaptor to
the side of the tee closest to the unit.
6. Install the drain valve on the tee opposite the adaptor.
7. Run interconnecting tubing from the tee to HWG
water out.
8. Cut the cold water “IN” line going to the water heater.
9. Insert the reducing solder tee in line with cold water
“IN” line as shown.
10. Run interconnecting copper tubing between the unit
DHW water “IN” and the tee (1/2-inch nominal). The
recommended maximum distance is 50 feet.
11. To prevent air entrapment in the system, install a vent
coupling at the highest point of the interconnecting lines.
12. Insulate all exposed surfaces of both connecting water
lines with 3/8-inch wall closed cell insulation.
NOTE: All plumbing and piping connections must comply
with local plumbing codes.