York YMB SERIES Installation Manual

Also see for YMB SERIES: User's information manual

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York YMB SERIES Installation Manual Manual pdf 3 page image

361813-UIM-A-0208Unitary Products Group 3GROUND INSTALLATIONThe unit may be installed at ground level on a solid base that will notshift or settle, causing strain on the refrigerant lines and possible leaks.Maintain the clearances shown in Figure 1 and install the unit in a levelposition.Normal operating sound levels may be objectionable if the unit is placeddirectly under windows of certain rooms (bedrooms, study, etc.).Condensate will drain from beneath the coil of the outdoor unit duringthe defrost cycle. Normally this condensate may be allowed to draindirectly on the ground.Elevate the unit sufficiently to prevent any blockage of the air entrancesby snow in areas where there will be snow accumulation. Check thelocal weather bureau for the expected snow accumulation in your area.Isolate the unit from rain gutters to avoid any possible wash out of thefoundation.ROOF INSTALLATIONWhen installing units on a roof, the structure must be capable of sup-porting the total weight of the unit, including a pad, lintels, rails, etc.,which should be used to minimize the transmission of sound or vibra-tion into the conditioned space.UNIT PLACEMENT1. Provide a base in the pre-determined location.2. Remove the shipping carton and inspect for possible damage.3. Compressor tie-down bolts should remain tightened.4. Position the unit on the base provided.NOTE: Heat pumps will defrost periodically resulting in water drainage.The unit should not be located where water drainage may freeze andcreate a hazardous condition - such as sidewalks and steps.LIQUID LINE FILTER-DRIERThe heat pumps have a solid core bi-flow filter/drier located on the liquidline.NOTE: Replacements for the liquid line drier must be exactly the sameas marked on the original factory drier. See Source 1 for O.E.M.replacement driers.PIPING CONNECTIONSThe outdoor unit must be connected to the indoor coil using field sup-plied refrigerant grade copper tubing that is internally clean and dry.Units should be installed only with the tubing sizes for approved systemcombinations as specified in Tabular Data Sheet. The charge given isapplicable for total tubing lengths up to 15 feet. See Application DataPart Number 036-61920-001 for installing tubing of longer lengths andelevation differences.NOTE: Using a larger than specified line size could result in oil returnproblems. Using too small a line will result in loss of capacity and otherproblems caused by insufficient refrigerant flow. Slope horizontal vaporlines at least 1" every 20 feet toward the outdoor unit to facilitate properoil return.PRECAUTIONS DURING LINE INSTALLATION1. Install the lines with as few bends as possible. Care must be takennot to damage the couplings or kink the tubing. Use clean harddrawn copper tubing where no appreciable amount of bendingaround obstruction is necessary. If soft copper must be used, caremust be taken to avoid sharp bends which may cause a restriction.2. The lines should be installed so that they will not obstruct serviceaccess to the coil, air handling system, or filter.3. Care must also be taken to isolate the refrigerant lines to minimizenoise transmission from the equipment to the structure.4. The vapor line must be insulated with a minimum of 1/2" foam rub-ber insulation (Armaflex or equivalent). Liquid lines that will beexposed to direct sunlight and/or high temperatures must also beinsulated.Tape and suspend the refrigerant lines as shown. DO NOT allow tubemetal-to-metal contact. See Figure 3.5. Use PVC piping as a conduit for all underground installations asshown in Figure 4. Buried lines should be kept as short as possibleto minimize the build up of liquid refrigerant in the vapor line duringlong periods of shutdown6. Pack fiberglass insulation and a sealing material such as perma-gum around refrigerant lines where they penetrate a wall to reducevibration and to retain some flexibility.7. See Form 690.01-AD1V for additional piping information.The outdoor unit should not be installed in an area where mud orice could cause personal injury. Remember that condensate willdrip from the unit coil during heat and defrost cycles and that thiscondensate will freeze when the temperature of the outdoor air isbelow 32°F.Failure to do so or using a substitute drier or a granular type mayresult in damage to the equipment.Filter-DrierSource 1 Part No.Apply with ModelsYMB / HC3A / HL3A026 - 25512 - 000 All SizesFIGURE 2: Tubing HangerFIGURE 3: Underground InstallationLiquidLineIncorrectCorrect TapeSheet Metal HangerInsulated Vapor LineTO INDOOR COIL TO OUTDOOR UNITLIQUID LINECAPPVCCONDUITINSULATEDVAPOR LINE