CS2 Central Station Air Handlers.pdf - Dunham-Bush Americas

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Typical Steam Coil Piping DiagramsLOW PRESSURE OPEN GRAVITY RETURN SYSTEM12" MINUNIONVENTHIGH PRESSURE SYSTEMWater Piping12" MINUNIONVENTSTEAM MAINGATE VALVESTRAINERCONTROL VALVEVACUUM BRKR1/2" 15°CHK. VALVEGATE VALVEUNIONCOMBINATIONFLOAT ANDTHERMOSTATICUNION TRAPSTRAINERDIRT POCKETRETURN MAINSTEAM MAINGATE VALVESTRAINERCONTROL VALVEUNIONFLOAT ORBUCKET TRAPUNIONSTRAINERDIRT POCKETRETURN MAINOPENVENTAll piping must be supported independent of coils.Swing joints or flexible fittings must be provided toabsorb expansion and contraction strains. Rigid pipingmay also reduce effectiveness of vibration isolators.The water supply should always be connected to thebottom inlet of the coil. The coil connections areidentified with stickers.Direct ExpansionBoth the liquid distributor and the suction line extendthru the casing.The expansion valve utilized must be of the externalequalizer tube type. The expansion valve bulb must belocated on the suction line between the coil and the1/4" external equalizer tube. Never locate the bulb in atrap.All refrigerant piping practices used should be inaccordance with local codes and latest ANSI StandardB9 Safety Code. Hard drawn type “L” or “K” coppertubing should be used. Soft tubing where bending isrequired may be used provided it is protected inaccordance with local code restrictions.Good practices should be followed as to pullingadequate vacuum, tubes cleaned of foreign material,etc.Start-UpMake sure all bolts and screws are tight.Remove tagged shipping tie down bolts and spacersfrom the fan and motor assembly before start-up. Referto page 5.Check the sheaves to see if they are in alignment andmake sure the set screws are tight. Make sure that thedimension across the top is equal on all grooves,otherwise excessive belt wear will result.Check for proper rotation of the blower pulley. Threephase motor rotation can be reversed by exchangingtwo of the three leads at the motor starter. The rotationof single phase motors can be reversed by exchangingleads inside the motor junction box. Refer to thediagram on the motor.Check the amperage draw of the motor. This shouldnot exceed the nameplate amps shown on the motorserial plate.After approximately two weeks of operation, the beltswill have nearly acquired their permanent stretch. Afterthis interval, the belt tension should be checked againand proper adjustment made.Water coils, 3 thru 10 rows, are supplied with a ventand drain connection (1/4" MPT) which extends thruthe unit casing.For protection of coils exposed to freezing temperatures,refer to page 7.Coils must be adequately vented in order to prevent airbinding.4
MAINTENANCE○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○The belt tension should be checked at three-monthintervals.Re-lubricable bearings mounted inside the fan sectionhave extended lubrication lines which are mounted onthe outside of the fan panels. The suggested greasinginterval is indicated on a sticker attached to the unit.It is recommended that bearings be lubricated with ahigh quality lithium base grease at intervals indicatedon sticker attached to the unit.Instructions are included on the motor nameplate forlubricating the motor bearings.The filters should be periodically inspected and replacedor cleaned when necessary. Dirty filters reduce the airflow which reduces the capacity of the system. Do notoperate system without filters.All CS 2 Units are Internally IsolatedIsolators are installed and adjusted at the factory.Brackets and bolts tie down the fan and motor assemblyfor shipment. Remove tie down bolts before start-up.Refer to page 4 for clarification.Remove the bolt from bracket to motor support base,then loosen bolts to frame and slide bracket to end ofslot so bracket is not in contact with the motor supportbase. The bracket then acts as a snubber on fan startup.END RAILMOTOR BASE SUPPORT(4) SHIPPING BRACE /SNUBBER(DO NOT DISCARD)Lube inlet vanes and/or damper linkage annually.Check for drain clogging several times a year.Clean coils and drain pans as necessary.Condensate Drain TrapsThe condensate drain trap piping must be properlydesigned to insure the removal of condensate. Incorrecttrapping can hold water in pan causing overflow. Onblow thru units, particularly, system air can escape downthe drain with incorrect trapping.ISOLATORISOLATOR RAILCONDENSATE DRAIN TRAP(AIR SEAL)1¼" PIPE DRAIN CONNECTIONAB(a) On draw-thru units (A) shall be equal to or greaterthan the coil sections negative pressure at operatingconditions.(b) On blow-thru units (A) can be as small as 1" but (B)must equal or exceed the total static pressure inthe coil section.5
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Page 3: INSTALLATION○ ○ ○ ○ ○ ○
Page 7 and 8: Water Coils Exposed To FreezingTemp
Page 13 and 14: SHIPPING MODULES ○ ○ ○ ○

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