3.Attacheachofthe4metalriggingbracketsunderthepanel
rainlip(seeFig.5).Usethescrewsremovedinstep2above
tosecurethebracketstotheunit.
PROPERTYDAMAGEHAZARD
Failuretofollowthiswarningcouldresultin personal
injury/deathorpropertydamage.
RiggingbracketMUSTbeundertherainliptoprovkle
adequatelifting.
PROPERTYDAMAGEHAZARD
Failuretofollowthiswarningcouldresultin personal
injury/deathorpropertydamage.
Donotstripscrewswhenre-securingtheunit.Ifascrewis
stripped, replace the stripped one with a larger diameter screw.
Ri_in_/Liftin_ of Unit
1. Bend top of brackets down approximately 30 degrees from
the corner posts.
2. Attach straps of equal length to the rigging brackets at
opposite ends of the unit. Be sure straps are rated to hold the
weight of the unit (see Fig. 5).
3. Attach a clevis of sufficient strength in the middle of the
straps. Adjust the clevis location to ensure unit is lifted level
with the ground.
4. After unit is securely in place, detach rigging straps. Remove
corner posts, screws, and rigging brackets, then reinstall
screws.
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
When straps are taut. the clevis should be a minimum of 36
inches above the unit top cover.
After the unit is placed on the roof curb or mounting pad, remove
the top crating. On 50SZ060 units only, 2 wire ties fastened to the
outdoor coils and reversing valve/accumulator assembly must be
cut. Remove the left and front Iouvered panels and corner post to
access wire ties. The wire tie to be cut on the left is located
approximately 4 in. down the tube sheet. The wire tie to be cut on
the right is located approximately 6 in. down the tube sheet.
Step 6--Connect Condensate Drain
NOTE: When installing condensate drain connection be sure to
comply with local codes and restrictions.
Model 50SZ disposes of condensate water through a 3/4 in. NPT
fitting which exits through the base on the evaporator coil access
side. See Fig. 2 & 3 for location.
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in ground
level installations. Install a field-supplied condensate trap at end of
condensate connection to ensure proper drainage. Make sure that
the outlet of the trap is at least 1 in. lower than the drain pan
condensate connection to prevent the pan from overflowing (see
Fig. 8). When using a gravel apron, make sure it slopes away from
the unit.
Connect a drain tube using a minimum of 3/4 in. PVC or 3/4 in.
copper pipe (all field-supplied) at the outlet end of the 2-in. trap. Do
not undersize the tube. Pitch the drain tube downward at a slope of
at least l-in. for every 10 ft. of horizontal run. Be sure to check the
drain tube for leaks. Prime trap at the beginning of the cooling
season start-up.
1" (25mm) MIN.
TRAP
_-_ OUTLET
2" (50mm) MIN.
099013
Fig. 8 - Condensate Trap
Step 7--Select 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 ordinances.
Select and size ductwork, supply- air registers, and return air grilles
according to ASHRAE (American Society of Heating,
Refrigeration, and Air Conditioning Engineers) reconmmndations.
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:
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 Table 1.
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
Table 2. 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 duc_vork passing
through conditioned spaces. Follow latest Sheet Metal and
Air Conditioning Contractors National Association
(SMACNA) and Air Conditioning Contractors Association
(ACCA) minimum 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.
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