Carrier 50JS ÐSelect and Install Ductwork, ÐProvide for Condensate Disposal, Unit Maximum Weight

5.Tighten the tension buckle until it is taut. Lifting brackets must be secure in the handholds.

6.Attach field-supplied clevis or hook of sufficient strength to hole in the lifting bracket (See Fig. 8).

7.Attach the 2 safety straps directly to the clevis or hook at the 4 rigging brackets. DO NOT attach the safety straps to the lifting brackets (See Fig. 8).

				914-137"
		“A”		(36"-54")
“B”
					DETAIL A
					SCALE 0.250
			TIGHTEN STRAPPING SECURELY
			WITH TENSION BUCKLE
		INSTALL SAFETY STRAPS TO
		RIGGING CLEVIS AT 4 RIGGING BRACKETS
		PLACE RIGGING BRACKET ASSEMBLY IN 4
		HAND HOLES AND INSTALL TIE DOWN STRAP
		AROUND PERIMETER OF UNIT AND THROUGH
SEE DETAIL A		SPACE IN BRACKET ASSEMBLY
						C99075
UNIT	MAXIMUM WEIGHT			A	B
Size	lb.	kg.	in.	mm.	in.	mm.
50JS018	305	138.4	19.5	495.3	16.75	425.5
50JS024	311	141.1	18.5	469.9	16.75	425.5
50JS030	309	140.2	19.5	495.3	17.50	444.5
50JS036	313	142.0	19.5	495.3	17.75	450.9
50JS042	345	156.4	19.5	495.3	17.75	450.9
50JS048	375	170.1	20.5	520.7	20.62	523.8
50JS060	440	199.6	19.5	495.3	19.75	501.7
50JX024	321	145.6	19.0	482.6	18.25	463.6
50JX030	342	155.2	20.0	508	19.25	489
50JX036	350	158.8	20.0	508	19.0	482.6
50JX042	372	168.8	21.0	533.4	20.5	520.7
50JX048	377	171.0	20.0	508	21.25	539.8
50JX060	450	204.2	21.0	533.4	20.0	508.0

Fig. 8ÐSuggested Rigging

8.Position lifting point directly over the unit's center of gravity.

9.Lift unit. When unit is directly over the roof curb, remove the 2 safety straps. Lower the equipment onto the roof curb.

Step 5ÐSelect and Install Ductwork

The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of non-residence type air conditioning and ventilating systems, NFPA 90A or residence-type, NFPA 90B and/or local codes and ordi- nances.

Select and size ductwork, supply-air registers, and return air grilles according to ASHRAE (American Society of Heating, Refrigera- tion, and Air Conditioning Engineers) recommendations.

The unit has duct flanges on the supply- and return-air openings on the side of the unit.

When designing and installing ductwork, consider the following:

For vertical supply and return units, tools or parts could drop into ductwork and cause serious injury or death. Install a 90 degree turn in the return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space. Units with electric heaters require 90 degree elbow in supply duct.

1.All units should have field-supplied filters or accessory filter rack installed in the return-air side of the unit. Recommended sizes for filters are shown in Tables 1A and 1B.

2.Avoid abrupt duct size increases and reductions. Abrupt change in duct size adversely affects air performance.

IMPORTANT: Use flexible connectors between ductwork and unit to prevent transmission of vibration. Use suitable gaskets to ensure weather tight and airtight seal. When electric heat is installed, use fireproof canvas (or similar heat resistant material) connector between ductwork and unit discharge connection. If flexible duct is used, insert a sheet metal sleeve inside duct. Heat resistant duct connector (or sheet metal sleeve) must extend 24-in. from electric heater element.

3.Size ductwork for cooling air quantity (cfm). The minimum air quantity for proper electric heater operation is listed in Tables 2A and 2B. Heater limit switches may trip at air quantities below those recommended.

4.Seal, insulate and weatherproof all external ductwork. Seal, insulate and cover with a vapor barrier all ductwork passing through conditioned spaces. Follow latest Sheet Metal and Air Conditioning Contractors National Association (SMACNA) and Air Conditioning Contractors Association (ACCA) mini- mum installation standards for residential heating and air conditioning systems.

5.Secure all ducts to building structure. Flash,weatherproof, and vibration-isolate duct openings in wall or roof according to good construction practices.

CONVERTING HORIZONTAL DISCHARGE UNITS TO DOWNFLOW (VERTICAL) DISCHARGE UNITS

Before performing service or maintenance operations on system, turn off main power to unit. Turn off accessory heater power switch if applicable. Electrical shock could cause serious injury or death.

1.Open all electrical disconnects before starting any service work.

2.Remove side duct covers to access bottom return and supply knock outs.

3.Use a screwdriver and hammer to remove the panels in the bottom of the base pan.

4.Reinstall the side duct covers to block off the horizontal air openings.

NOTE: These panels are held in place with tabs similar to an electrical knockout.

NOTE: Avoid abrupt duct size increases and reductions. Abrupt change in duct size adversely affects air performance.

Step 6ÐProvide for Condensate Disposal

NOTE: Ensure that condensate-water disposal methods comply with local codes, restrictions, and practices.

6