American Water Heater 318281-000 instruction manual Plumbing Configuration, Function, Check valves

PLUMBING CONFIGURATION

FLOW CLOSED

Figure 25

10.	Check and set the pressure of the air bladder in the
	expansion tank to 25 psi. If the pressure is higher
	bleed pressure out until it is correct. If the pressure
	is too low add air by use of a compressor or bicycle
	pump until the pressure is correct.
11.	Plumb the solar pump station to the storage tank
	and to the collector: The tank connections should
	use ¾” copper pipe and can be connected using

1 2 L

K

H

V

3 4

1.½” copper tube - from the collector outlet (top) to the collector return compression fitting (K)

2.½” copper tube – from the collector inlet (bottom) to the collector supply compression fitting (L)

3.¾” copper tube – from the upper tank coil inlet marked “from collector” to the tank supply threaded fitting

(H)

4.¾” copper tube – from the lower tank coil outlet marked “to pump” to the tank return threaded fitting

(V)

the threaded adaptors provided. The collector

connections should use ½” copper pipe and can be

connected with the the compression fittings provided.

The total piping run in the solar loop should not

exceed 200 equivalent feet. Failure to limit the line

length may cause poor system performance and lead

to premature pump failure.

12. Add the supplied copper drain valve to the lowest

point in the collector loop (near the tank by the

bottom coil outlet labeled “to pump” in most cases)

Installing the ½” copper to and from the collector using the compression fittings.

1.Pushtheunionnutdandthecutting ring eonto the copper pipe c. The pipe must protrude at least 3/8” (3 mm) from the cutting ring in order to ensure the force transmission and the sealing.

2.Insert the support sleeve f into the copper pipe.

3.Insert the copper pipe with the plugged-on individual parts (d, e and f) all the way into the housing of the compression fitting g.

4.First screw the union nut d manually.

5.Tighten the union nut dby rotating one full turn. Hold the housing of the compression fitting g to avoid rotation in order to avoid damaging the sealing ring.

Figure 26

Figure 27

FUNCTION

Check valves

The solar station is equipped with check valves in the supply and the return ball valve (J, Q).

For filling, venting and flushing of the installation the check valves must be turned to the correct position. To set the proper position for the check valves take off the temperature gauges (C, E), remove the top cover (D) and turn the ball valves into the proper position using a wrench (see Figure 28). In the 45° position the balls in the ball valves push the check valves open.

During operation the ball valves must be in 0° position.

0°	45°	90°
Check valve is	Check valve is not	Ball valve
operating, flow	operating, flow in	closed,
only in flow	both directions.	no flow.
direction
	Figure 28

22