Rheem RS120-64BP Instruction Manual download pdf (Page 26)

Isolating the Major Components and System Shut Down

Procedures

Your solar water heating system is designed so

that the key components can be easily isolated

for emergency repairs or routine maintenance.

By shutting a single valve you can isolate the

entire system from the pressurized cold water

supply line (No. 19). In the case of a storage

tank or tting leak immediately shut this valve

and call your installation contractor for service.

The collector loop can be isolated from the solar

storage tank by closing isolation ball valves

(Nos. 6 and 8). If the pressure in this loop drops

or you nd a glycol leak shut these valves and

contact your installation contractor. Turn the

circulating pump off by setting the controller to

the “off” position.

In two tank systems the solar storage tank can

be isolated from the back-up water heater.

Set all necessary isolation ball valves to the off

position to service the solar storage tank or the

back up water heater.

Solar water heating systems can build up very

high temperatures when there is no daily draw

on the system. If a short summer vacation

is planned the best way to dissipate heat in

the system is to set the controller to the "on"

position. The circulating pump will run twenty-

four hours a day and cool off the water in

the solar storage tank at night. The collector

radiates heat back to the atmosphere at night,

preventing the system from stagnating at very

high temperatures. This will not harm the pump

or add substantially to your monthly utility bill.

Remember to set the control to the "Automatic"

setting upon your return!

During extended summer vacations (4 weeks

or more) it is advisable to either cover the

solar collectors with an opaque material or to

manually drain the collector loop HTF. The

manufacturer recommends that you cover the

collectors if practical.

If you choose to drain the HTF in the collector

loop follow these steps:

• Turn the controller to the “off” position

(No. 4).

• Connect one end of a garden hose to the

isolation/drain valve (No. 6) and place

the other end in a ve gallon bucket.

Open the valve and gravity will drain the

heat transfer uid into the bucket. Repeat

process using isolation / drain valve

(No. 7). A licensed recycler, reclaimer or

incinerator must dispose of the Dowfrost

HD.

DO NOT DUMP DOWFROST HD INTO

A STORM SEWER, ON THE GROUND

OR INTO ANY BODY OF WATER.

BE CAREFUL. THE HTF MAY BE

EXTREMELY HOT!

If the system is installed with an optional time

clock make sure the clock is not preset to

go "ON" during your absence. If you have a

mechanical time switch, remove the "on" tripper

from the clock face (No. 33).

When you return home contact your service

contractor to recharge the system with HTF.

After the system has been recharged, set the

controller to the “automatic” position.

Summer Vacation Recommendations and Procedures

Use and Care of the System

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Rheem RS120-64BP Instruction Manual Page 26

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