Carrier AQUAZONE 50KQE Series Installation, Operation And Maintenance Instructions

Contents

Carrier AQUAZONE 50KQE Series Installation, Operation And Maintenance Instructions Manual pdf 18 page image

183.6 - Supply and return piping installationIMPORTANT:Right-hand units - entering water is upper pipe.Left -hand units - entering water is lower pipe.CAUTION: To ensure proper functioning of unit and system,be sure to connect entering water to upper pipe on right-handunits. On left-hand units, connect entering water to lowerpipe.3.6.1 - Supply and return hosesOptional pressure-rated hose assemblies are available for usewith units. Use the following guidelines when installing supplyand return hose assemblies.1. Install supply and return hoses fitted with swivel-jointfittings at one end to prevent the hose from twisting.2. Use male adapters to secure the hose assembly to the unitand the riser.3. Do not allow the hose to twist during installation. Twistingmay damage the hose wall or the rubber compound.4. Use pipe joint compound sparingly on the fitting adapters’male pipe threads.5. Prevent sealant from reaching the joint’s flared surfaces.6. Do not use pipe joint compound when Teflon thread tapeis pre-applied to hose assemblies or when flared-endconnections are used.7. Maximum torque that may be applied to brass fittings is40.8 Nm. When a torque wrench is not used, tighten brassfittings finger-tight plus one quarter turn.8. Tighten steel fittings as necessary.9. Shut-off/balancing valves, flow indicators, and drain teesin the supply runout and return at each floor aid in loopbalancing and servicing.3.6.2 - Supply and return pipingSystem piping MUST comply with all applicable codes.1. Install a drain valve at the base of each supply and returnriser to enable system flushing at start-up and duringroutine servicing.2. Install shut-off/balancing valves and unions at each unit toallow unit removal for servicing.NOTE: If flex hoses are used, unions are not necessary.3. Install strainers at the inlet of each system circulating pump.NOTE: Since loop temperatures are normally between 15 and32∞C, pipe sweating and heat loss do not occur at normalambient temperature conditions. Insulation must be installed onloop water piping on those sections that run through unheatedareas or are located outside the building. If loop temperaturesare expected below the ambient dew point, the optional internalinsulation (extended range) package must be ordered.CAUTION: DO NOT bend or kink supply lines or hoses.Damage to unit may result.4. Before making the final water connections, flush the systemas described in the Pre-Start-Up section of this manual.After flushing the system, connect piping and hoses to theproper supply, return and condensate connections of the unit.NOTE: When necessary, use adapters to connect hoses.5. Install any other system components, as required, followingmanufacturer’s instructions.6. Reinstall the front cabinet by carefully lowering the frontcabinet over the chassis onto the backplate.3.7 - Condensate piping installationConnect the unit condensate drain to the building condensatedrain with a flexible, nonpressure-rated 5/8-in. ID plastic hose.Avoid kinks in this hose to ensure an unobstructed flow of con-densate from the unit to the drain.The horizontal run of the condensate hose is usually too shortto pose any drainage problems, however, the horizontal run ofcondensate line should be pitched at least 100 mm for every500 mm of run (in the direction of flow). Avoid low points andunpitched piping since dirt collects in these areas and may causestoppage and overflow.Field installation of a trap or vent is not required unless specifiedby local codes. The 50KQE units are designed in a blow-throughconfiguration. The condensate drain pan is located on the outletside of the blower so that the pressure in the drain pan is higherthan the atmospheric pressure.