Harman Stove Company SF2600A - Manual (Page 16)

6
Special Instructions
Hot Water Out
Cold Water In
Pressure
Relief Valve
Existing Water
Heater Rear Of
Furnace
Automatic
Air Valve
Pressure
Relief Valve
(Must be within
2 feet of coil)
10 Feet Maximum
Drain
Valve
1
2
3
3
4
5
Plumbing diagram For Thermo-Siphon method - maximum distance = 10 Feet
Place one of the supplied nuts on each leg of the coil. Place the coil through the holes on the back of
the furnace, and adjust the nuts so that the pipes stick out about ¼ to ½ inches from the rear of the
furnace. Place the flat washers and gaskets over each pipe and tighten the nuts. You are now ready
to run the piping.
This simple method is the most economical. However, the existing water heater must be less than
0 feet from the furnace. The water inlet, where the Temperature / Pressure Relief valve is located,
must be higher than the top leg of the water coil. The water heater should be elevated, if necessary,
to allow for proper thermo-siphon action.(The method by which hot water will circulate automatically
through the system.)
A. Shut off the water heater and the water supply to it. Drain the tank completely.
B. Remove the Temp. / Presure relief valve and discard. Install a short 3/4 in. nipple and tee () along
with a new relief valve.
C. run 3/4 in. copper tubing between the water tank and the top leg of the coil. Install a 3/4 in vent
elbow and automatic “float type” air vent (2) in the high point of the line. Within 2 feet of the top leg of
the coil, install a 50 lb. pressure relief valve (5). Run 3/4 in. tubing from the release exit of both relief
valves downward (3) so the hot water can escape in the event of an overheat situation.
D. Remove the drain valve, at the bottom of the tank. Install a short 3/4 in. nipple and tee and re-
install the drain valve to the tee (4). Run 3/4 in. tubing between the drain / tee combination and the
lower leg of the water coil. After all of the connections are secured, refill the water tank. Turn on the
water heater only after the tank has been completely refilled.
Coil Installation: