5.Tighten the tension buckle until it is taut. Lifting brackets must be secure in the handholds.
6.Attach
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).
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“B” |
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| DETAIL A | |
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| SCALE 0.250 | |
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| TIGHTEN STRAPPING SECURELY |
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| WITH TENSION BUCKLE |
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| INSTALL SAFETY STRAPS TO |
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| RIGGING CLEVIS AT 4 RIGGING BRACKETS |
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| PLACE RIGGING BRACKET ASSEMBLY IN 4 |
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| HAND HOLES AND INSTALL TIE DOWN STRAP |
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| AROUND PERIMETER OF UNIT AND THROUGH |
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SEE DETAIL A |
| SPACE IN BRACKET ASSEMBLY |
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| C99075 |
UNIT | MAXIMUM WEIGHT |
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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
Select and size ductwork,
The unit has duct flanges on the supply- and
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
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
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
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
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