Bosch AE3.4 Reference manual

Freeze Prevention

Service Bulletin TWH-E1-01

Models: AE3.4, AE7.2, AE9.5, AE12, RP1P, RP2P, RP3P, RP7P, RP9P, RP12PT,

RP1, RP2, RP3, RP7, RP9, RP12, RP12T

WARNING

ELECTRICITY IS EXTREMELY DANGEROUS.

TAKE EXTRA PRECAUTIONS AND ENSURE

ALL CIRCUIT BREAKERS ARE OFF BEFORE

PERFORMING ANY WORK TO THE HEATER.

Introduction

Please note that the instructions in the manual state that the water

heater must not be installed in a location where it may be exposed

to freezing temperatures. If the water heater is installed in a

summer cottage or other location where it may be subject to

freezing, the only way of assuring protection is to completely remove

the heater during those times the area may experience freezing

temperatures.

If the heater must be left in a space which is likely to experience

freezing temperatures (less than 32° F) all water must be drained

from the heater. Due to the coil shape of the heat exchanger, it can

be difcult to drain all the water from the heater. Even in cases

where compressed air is used to blow out the water from the heat

exchanger, water may still remain in the ow switch body and

tubing.

Draining procedure

The following suggestions are made only to help minimize the

potential for freeze damage and are not to be construed as the

recommended method for dealing with freeze possibilities. The only

recommended method for preventing freeze damage is to remove

the heater from the site whenever there is a chance of freezing.

Draining the heater to minimize the potential for freezing:

• Disconnect the electric supply.

• Shut off the cold water supply and disconnect the hot and cold

water pipes from the heater. Allow water to drain from the

heater. (Have a catch basin ready.)

• Blow short bursts of compressed air into the inlet of the heater

to remove as much water as possible.

Leaving the heater in a freezing environment may result in damage to

the heater’s heat exchanger or ow switch. Additionally, water

leakage from frozen components may damage electric components

of the heater. This damage is not covered under the heater’s

warranty.

Heater reinstallation

If the water heater was removed due to freezing temperatures, it is

important to reinstall it per the installation requirements. Water

heaters installed other than the mounting orientation shown in

Figure 1 may fail to operate. All models can be installed per

Installation #1 as shown in Figure 1. All models except AE12,

RP12PT and RP12T can be installed per Installation #2 as shown in

Figure 1.

1 2 |TWH-E1-01 | AE3.4, AE7.2, AE9.5, AE12, RP1P, RP2P, RP3P, RP7P, RP9P, RP12PT, RP1, RP2, RP3, RP7, RP9, RP12, RP12T

Data subject to change without notice | Printed in the USA | BTC 721002302 A | 10.2009 Bosch Thermotechnology Corp.

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-866-642-3198

Fax: 1-603-584-1681

www.boschhotwater.com

Installation #1Installation #1

Figure 1

hot cold

hot

cold

Installation #2

wall

floor

wall

floor

front

view

front

view

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