Bosch 125B LP Specifications download pdf (Page 20)

6 720 644 951 (2014/11) 330 PN

20 | Operation instructions

Fig. 14 Plumbing connections and pressure relief valve

shown with optional Webstone service valves

4.10 Recirculation application

Since recirculation through the heater is not permissible, the

following drawing is provided to outline a proper recirculation

application using the BOSCH PRO water heater with an Ariston

minitank. This schematic is for illustration only and must not be

used for actual installation without appropriate engineering

and technical advice from a professional properly licensed in

locality where the installation is made.

Fig. 15 Recirculation application

[1] Full port isolation valve

[2] Circulator

[3] Check valve

[4] PRV

[5] Expansion tank

The use of a small electric mini-tank (4-6 gallon size) should be

used for this application and designed so the pump will

circulate the water through the mini-tank and the building's hot

water return loop only. A timed or thermostatically controlled

operation of the pump is commonly done. The 330 PN should

be plumbed in line before the mini-tank water heater. Contact

Bosch Water Heating if further instruction is needed.

5 Operation instructions

5.1 For your safety read before operating your

water heater

A. This appliance employs a piezo-igniter to light the pilot

burner. When lighting the pilot, follow these instructions

exactly.

B. What to do if you smell gas.

WHAT TO DO IF YOU SMELL GAS

▶ Close gas valve. Open windows.

▶ Do not try to light any appliance.

▶ Do not touch any electric switch; do not use any phone in

your building.

▶ Immediately call your gas supplier from a neighbors phone.

Follow the gas supplier’s instructions.

▶ If you cannot reach your gas supplier, call the fire

department.

C. Use only your hand to push in the gas control buttons. Never

use tools. If a button will not push in, check to make sure the

buttons are being pushed in the proper sequence. Follow these

instructions exactly. If control button(s) are jammed, close the

heater’s individual manual shutoff valve and call a qualified

service technician. Forced or attempted repair may result in a

fire or explosion.

D. Do not use this appliance if any part has been under water.

Immediately call a qualified service technician to inspect the

6720608030-19.4Av

WARNING:

▶ If you do not follow these instructions

exactly, a fire or explosion may result

causing property damage, personal

injury or loss of life.

Upon initial installation, existence of air in

the gas supply line and in the water line may

cause some ignition delay. In that case,

repeat the ignition process until all the air

has been purged.

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Bosch 125B LP Specifications Page 20

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