York SUNLINE PLUS D2EG 048 Installation Instruction

Contents

PILOT CHECKOUTThe pilot flame should envelope 3/8 inches of the end of theflame sensor. Refer to Figure 12. To adjust pilot flame, (1)remove pilot adjustment cover screw, (2) adjust the screw forthe proper pilot flame, (3) be sure to replace cover screw afteradjustment to prevent possible gas leakage.Put the system into operation and observe through completecycle to be sure all controls function properly.BURNER INSTRUCTIONSTo check or change burners, pilot or orifices, CLOSE MAINMANUAL SHUT-OFF VALVE AND SHUT OFF ALL POWERTO THE UNIT.1. Remove the two screws holding either end of the manifoldto the burner supports.2. Open the union fitting in the gas supply line just upstream ofthe unit gas valve and downstream from the main manualshut-off valve.3. Remove the gas piping patch plate.4. Disconnect wiring to the gas valve and spark ignitor.Remove the manifold-burner gas valve assembly by liftingup and pulling back.Burners are now accessible for service.Reverse the above procedure to replace the assembly. Makesure that burners are level and seat at the rear of the heatexchanger.BURNER AIR SHUTTER ADJUSTMENTAdjust burner shutters so that a distinct, sharp, blue flame isobtained. Refer to Figure 13.SUPPLY AIR AIR BLOWER AND TEMPERATURERISE ADJUSTMENTSThe speed of the supply air blower will depend on the requiredCFM, the unit accessories and the static resistances of both thesupply and the return air duct systems. With this information,the speed for the supply air blower can be determined from theblower performance and accessory static resistance data inTable 5 through 8.Knowing the required blower RPM and the blower motor HP,the speed setting for the supply air motor can be determined.The setting (turns open) for the optional belt-drive supply airmotor pulley can be determined from Table 13.OPTIONAL BELT-DRIVE BLOWERAll units with belt-drive blowers have single speed motors. Thevariable pitch pulley on the blower motor can be adjusted toobtain the desired supply air CFM. Refer to Table 9 for blowermotor and drive data. The tension on the belts should beadjusted as shown in Figure 14.Start the supply air blower motor. Adjust the resistances in boththe supply and the return air duct systems to balance the airdistribution throughout the conditioned space. The jobspecifications may require that this balancing be done bysomeone other than the equipment installer.To check the supply air CFM after the initial balancing has beencompleted:1. Remove the (two) " dot plugs from the holes located onthe filter access panel side of the unit.2. Insert at least 8" of 1/4 inch tubing into each of these holesfor sufficient penetration into the air flow on both sides ofthe evaporator coil.Unitary Products Group 15035-14832-003-A-0204FIG. 12 - PROPER FLAME ADJUSTMENTFIG. 13 - TYPICAL FLAME APPEARANCETURNSOPEN*BLOWER DRIVE RANGE (RPM)3 TON 4 TON 5 TON5432107808429049661028109079085692298810541120850924998107212461220*Pulley can be adjusted in half-turn increments.TABLE 13 - BELT-DRIVE SUPPLY AIRMOTOR PULLEY ADJUSTMENTSPAN LENGTHDEFL FORCE* NEVER LOOSEN(A) (C)*(D)CAUTIONProcedure for adjusting belt tension:1. Loosen nut (D) from the motor mount.2. Never loosen nuts (C) from each other while loosening nut (D).3. Adjust the tension by turning bolt (B).4. Do not loosen the four nuts (top and bottom) (A); unless additional tensioningdistance is required; immediately re-tighten these bolts if loosened.5. Use a belt tension checker to apply a perpendicular force to one belt at themidpoint of the span as shown. The deflection force should be applieduntil a specific deflection distance of 4mm (5/32")is obtained. To determinethe deflection distance from normal position, use a straight edge fromsheave to sheave as a reference line. The recommended deflection forceis as follows:Tension new belts at the max. deflection force recommended for the beltsection. Check the belt tension at least two times during the first 24 hours ofoperation. Any re-tensioning should fall between the min. and max.deflection force values.6. After adjusting, re-tighten nut (D) against the motor mount taking care notto loosen nuts (C).(B)FIG. 14 - BELT ADJUSTMENT