Bosch 520-HN-N Specifications download pdf (Page 14)

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Operation instructions

3.10 Recirculation application

Since recirculation through the heater is not

permissible, the following drawing is provided to outline

a proper recirculation application using the Aquastar

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. 17 Recirculation application

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 GWH 1600 H should be plumbed

in line before the mini-tank water heater. Contact Bosch

Water Heating if further instruction is needed.

4 Operation instructions

4.1 For your safety read before

operating your water heater

B A. This appliance is equipped with electronic ignition

for lighting the pilot and main burners. When turning

the heater on, follow these instructions exactly.

B. Before operating the unit, set the On/Off switch to

the On position. The On/Off switch is located

behind the flip-down coverplate on the front panel

strip. Smell all around the appliance area for gas. Be

sure to smell next to the floor because some gas is

heavier than air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS

B Close gas valve. Open windows.

B Do not try to light any appliance.

B Do not touch any electric switch; do not use any

phone in your building.

B Immediately call your gas supplier from a neighbors

phone. Follow the gas supplier’s instructions.

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

department.

C. Use only your hand to push in the on/off control

button. Never use tools. Follow these instructions

exactly. If control button is jammed, close the gas

supply and call a qualified service technician.

Attempted forceful 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 appliance and to replace any part of the

control system and any gas control which has been

under water.

Warning: If you do not follow these

instructions exactly, a fire or explosion

may result causing property damage,

personal injury or loss of life.

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Bosch 520-HN-N Specifications Page 14

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