User manual DOMETIC AIRHANDLER

[. . . ] Airhandler Installation, Operation & Maintenance Manual Dometic Marine Rev. 20100818 L-2812 English PN: 0880268 www. dometicusa. com 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. [. . . ] The clips need only secure the unit from moving. The springy clips and insulation provide vibration isolation. Note that the top brackets have adjustable depth. ABL AIRHANDLERS · · ABL airhandlers are dual-blower airhandlers. ABL airhandlers can be suspended or deck mounted using the brackets provided. Suspension mounting is generally preferred, because heater access is from underneath. BLOWTHROUGH AIRHANDLERS · Blowthroughs are non-ductable airhandlers designed to be installed high in a cabin area, at the top of lockers, bulkhead corners, or overhead compartments. Because they are not ducted, they must be able to deliver air directly into the conditioned space. They must be located against the inside of a bulkhead or partition common to the space to be conditioned. The supply-air grille must have free area at least equal to the cross-sectional area of the coil (i. e. , length x width of the coil). If the Blowthrough cannot be flush mounted against the bulkhead or partition, a plenum chamber may be attached between the face of the coil and the inside of the partition. The cross-sectional area of the plenum must be equal or slightly larger than that of the coil. The plenum must be a short, straight run, and it must be completely sealed. Blowthroughs are NOT intended for ducted applications. The plenum must be insulated and have a good vapor barrier to prevent condensation. Wood is permeable to water and water vapor, and should be sealed to prevent delamination. There are four vibration isolation grommets in the top of the unit for suspension mounting. The filter and return air to a Blowthrough airhandler must be provided by a properly sized return-air grille. The filter must be located at the return-air grille, because the unit cannot accept a filter. Be sure any gaps in the return-air path are filled so that no return air can bypass the filter. · · · CIRCULATING WATER SYSTEM SERVICE VALVES Ball valves are required before and after each airhandler (see Figure 1). The ball valve for an airhandler should be ¾" full port for all airhandlers up to 24K. Airhandlers 30-36K should be 1" full port. Figure 1: Diagram of Airhandler Piping and Service Valves HOSE Flexible, reinforced hose between the service valve and the unit will isolate vibration. Hose to an airhandler should match the hosebarb that comes with the airhandler. [. . . ] There is also a condensate drain pan located under each chiller and the chilled water pump. ELECTRIC HEAT: Electric resistance heaters are used as a chill chaser in the airhandlers to warm the air, or in the chiller heater barrels to warm the circulating water in heat mode. FILL ASSEMBLY: The point where a water hose is temporarily attached to the circulating water circuit in order to fill it. The fill assembly typically includes a ball valve and a pressure reducing valve. GPM: Abbreviation for "gallons per minute", a term used to specify the amount of water flow through the chilled water or seawater system. R-VALUE: R-value is the industry standard measure of a material's resistance to heat transfer. The higher the R-value, the more effective it is as an insulator. RUN CAPACITOR: An electrical storage device used to reduce amperage to some electric motors for more efficient operation. [. . . ]