Converting Horizontal Discharge Units To Downflow (Vertical) Discharge Units; Provide For Condensate Disposal - Carrier 50JZ Installation, Start-Up And Service Instructions Manual

UNIT
Size
50JZ024
50JZ030
50JZ036
50JZ048
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 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.
(610 mm) from electric heater element.
3. Size ductwork for cooling air quantity (CFM or L/s). 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 ductwork passing
through conditioned spaces. Follow latest Sheet Metal and Air
Conditioning Contractors National Association (SMACNA)
"A"
"B"
PLACE RIGGING BRACKET ASSEMBLY IN 4
RIGGING HOLES AND INSTALL TIE DOWN STRAP
AROUND PERIMETER OF UNIT AND THROUGH
SPACE IN BRACKET ASSEMBLY
SEE DETAIL A
MAXIMUM WEIGHT
lb kg
321 145.6
342 155.2
350 158.8
377 171.0
Fig. 9—Suggested Rigging
914-137"
(36"-54")
TIGHTEN STRAPPING SECURELY
WITH TENSION BUCKLE
INSTALL SAFETY STRAPS TO
RIGGING CLEVIS AT 4 RIGGING BRACKETS
A
in.
19.0
20.0
20.0
20.0
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 horizontal duct covers to access bottom return and
supply knock out panels.
3. Use a screwdriver and hammer to remove the panels in the
bottom of the unit base.
NOTE: These panels are held in place with tabs similar to an
electrical knockout.
4. Reinstall the horizontal duct covers (Fig. 11) to block off the
horizontal air openings.
NOTE: Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
Step 6—Provide for Condensate Disposal
NOTE: Ensure that condensate-water disposal methods comply
with local codes, restrictions, and practices.
8
DETAIL A
SCALE 0.250
mm. in.
482.6 18.25
508 19.25
508 19.0
508 21.25
C99075
B
mm.
463.6
489
482.6
539.8