User manual DOMETIC MARINE AIR CHILLED WATER SYSTEM

[. . . ] Marine Air Chilled Water System Installation, Operation & Maintenance Manual Dometic Marine Rev. 20100818 L-2811 English PN: 0880270 COPYRIGHT © 2007-2010 Dometic Marine. No part of this publication may be reproduced, translated, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise without prior written consent by Dometic Marine. Every precaution has been taken in the preparation of this manual to ensure its accuracy. [. . . ] Your controls manual has more information specific to the particular type of controls used on your system. Be sure to read it carefully. START-UP LEAK TEST PIPE COPPER It is a good practice to leak test the loop plumbing throughout the installation of the system, as well as after the installation is complete. This is especially important when joints will be concealed and therefore very difficult to get to in case of a leak. A simple procedure of pressurizing the pipes with air will indicate whether that section of plumbing is sound. The piping should be able to hold 75 psi over a 12 hour period (minimum). Note that fluctuations in pressure may be noticed due to temperature changes, but a drop of over 5 psi indicates a leak, which should be found and fixed. Large leaks will be easily heard, but small leaks can be difficult to find. There are several ways of locating small leaks: · · · Add some water to the system before pressurizing with air. The water will travel to the leak and add to the noise as it escapes, as well as create a wet spot. If a joint is suspected to be leaking, a liquid leak detector (such as soap bubbles) can be applied to pinpoint the problem. Electronic devices are available which can help identify leaks by "listening" for high frequency noises characteristic of a leak. Finding leaks before the initial filling of the loop with water will save you from having to drain an entire system to fix leaks, as well as avoid expensive water damage to a completed vessel. L-2811 ENGLISH 13 START-UP Marine Air Chilled Water System Installation, Operation & Maintenance Manual PLASTIC PIPE Do NOT put pressurized gas into plastic pipe. It is unsafe. FLUSH As a condition of warranty, the installer is required to provide clean circulating water. Otherwise, dirt can collect in the evaporators causing them to freeze and rupture. Airhandler valves and other components can also become clogged or otherwise harmed by the dirt and debris. The best way to provide clean water is to assemble the circuit from clean components, fill the circuit with clean water, and then thoroughly flush the circulating water before connecting the chillers and airhandlers. However, even then it is common for the assembly process itself to generate debris such as bits of Teflon tape or pipe dope. Do not operate or run water through the chiller or airhandlers until the circulated water system has been thoroughly flushed. After the circulated water system has been completely installed, leak tested, and bled of most air, the circulation circuit should be flushed to remove any contaminants or debris in the piping. Remove the flexible hose connection from the inlet hose barb on each airhandler. Remove the flexible hose connection from the outlet hose barb on the chilled water circuit. The objective is to bypass the water flow and avoid running water through the chiller or airhandlers or other components where debris or sediment could do harm. NOTE: The circuit may be flushed prior to attaching airhandlers by following steps 4-9. [. . . ] When any of the chillers is turned on to heat or cool both PRPs are energized and switch each pump on. Each PRP should have its own circuit breaker sized for the pump, but not to exceed 20 amps. REFRACTOMETER: An instrument use to determine the freezing point of the solution (i. e. , of the mixture of circulating water and antifreeze). The refractometer determines the refractive index of the solution. Using data provided by the antifreeze supplier, the refractive index is used to determine the concentration of antifreeze in the solution (i. e. , the mixture of circulating water and antifreeze). The concentration of antifreeze determines the freezing point of the solution. REVERSING VALVE: (on reverse cycle units only) An electromagnetically controlled valve that reverses the flow of refrigerant between the condenser and evaporator of the chilled water condensing unit, thereby permitting heat to be extracted from the cabin in the cooling mode and added into the cabin in the heating mode. RFI FILTER: "Radio Frequency Interference" filter. [. . . ]