! Freeze Prevention Service Bulletin EP-03
Service Bulletin EP-03 Models: AE115, AE125, RP17PT, RP27PT (polymer modules only) Freeze Prevention Figure 1 ! WARNING Electricity is EXTREMELY Dangerous. Heater front view (cover removed) TAKE EXTRA PRECAUTIONS and ensure all circuit breakers are off before PERFORMING ANY WORK TO THE HEATER. Introduction Please note that the installation manual states that the water heater must not be installed in a location where it may be exposed to freezing temperatures. If the heater must be left in a space that is likely to experience freezing temperatures, all water must be drained from the heater. Freeze damage is not covered under the warranty. Circuit board NOTE: Use of agents like anti-freeze are not allowed as they may cause damage to the water heater’s internal components. Preparation Due to the shape of the heat exchangers and connecting pipe, it is extremely difficult to get all of the water out of the heater. Follow the procedure below to best minimize the chance of freezing: Short bursts of compressed air 1. Disconnect electric supply 2. Disconnect cold and hot water pipes from fittings on bottom of heater. Allow water to drain out (have a catch basin ready). 3. After allowing all water to drain out, the heater should be blown out with low pressure compressed air to remove as much water as possible from water heater modules (see figure 1). Bursts of air work better than continuous flow. Remember, these suggestions are only made to help minimize the potential for freeze damage and are not to be construed as the guaranteed method for dealing with freeze possibilities. Data subject to change without notice | Printed in the USA | BTC 722002303 A | 09.2010 Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel: 1-866-642-3198 Fax: 1-603-584-1687 www.boschpro.com Bosch Thermotechnology Corp.
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Bosch WH27 Tronic 240-Volt 26.9-kW 3.5-GPM Point of Use Tankless Electric Water Heater Use and care guide