Rheem RS120-64BP Instruction Manual download pdf (Page 18)

The sensor "bundle" must be placed under the

rubber pipe insulation covering the collector

header. Thoroughly wrap and weatherize the

insulation with electrician’s tape or insulation tape

as provided by the manufacturer (Rubatex Insul-

Tape or equal). See Figure 13 for collector sensor

installation detail.

Low Voltage Wiring

The low voltage wiring used to connect the sensors

to the controller should be a minimum 18 AWG.

The wiring should be bare or tinned copper, two

conductor, PVC insulated, with a PVC UV rated

gray jacket suitable for exterior use. Use Eastman

Wire & Cable No. 5704, Belden Wire and Cable

No. 8461 or equal.

Installing the Solar Storage Tank and

Expansion Tank

Refer to the installation manuals for the storage

tank and expansion tank.

Refer to Figure 16, Single Tank System

Schematic and Figure 17, 18 & 19 Double Tank

System Schematic on pages 28 - 31, for all items

listed as (No.##) through out this manual.

In plumbing the solar storage tank and expansion

tank make sure that all the components are

accessible and easy to reach. Provide for clear

access to the storage tank, pump, expansion tank,

mixing valve, and other key components. If a

component in the potable water side of the system

may require future service or maintenance make

the connections with brass unions. Use only brass

nipples and unions and copper and brass ttings

in plumbing the solar storage tank and expansion

tank. The use of galvanized ttings or nipples, di-

electric unions, CPVC, PVC or other plastic pipe is

prohibited.

Hard copper connections to the city cold water

supply line and the home hot water feed lines

are recommended. The gaskets in standard water

heater ex hose connectors can become brittle and

compressed over time and begin leaking on the

water heater. If not detected in a timely manner

even a small drip or leak may cause serious damage

to the tank’s electrical components or, in extreme

cases, may cause the tank to leak from the outside

in.

Tank plumbing is required to provide for the

isolation of the solar storage tank from the city

cold water supply line by means of an isolating ball

valve (No. 19).

Line thermometers shall be installed in the collector

supply and return lines to allow for a simple

diagnostic check of proper system operation. On

a sunny day the hot water return line should be

approximately 5 – 12° warmer than the water in

the collector supply line. Compare the temperature

readings in the two line thermometers (No. 22).

In a single tank system install a third thermometer

(No. 22) directly after the mixing valve above the

solar storage tank. In a two tank system you may

install the third thermometer either directly above

the hot outlet on the solar storage tank or after the

mixing valve on the back-up water heater.

Figure 13

COLLECTOR

SENSOR

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 35 36

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Rheem RS120-64BP Instruction Manual Page 18

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