Table1--Physical Data-Unit 50SZ
JNIT SIZE
_IOMINAL CAPACITY (ton)
3PERATING WEIGHT (lb.)
3OMPRESSOR
REFRIGERANT (R-22) Quantity (lb.)
REFRIGERANT METERING DEVICE
3RIFICE OD (in,)
3UTDOOR COIL
Rows... Fins/in.
Face Area (sq. ft.)
3UTDOOR FAN
Nominal Cfm
Diameter
Motor HP (RPM)
NDOOR COIL
Rows... Fins/in.
Face Area (sq. ft.)
INDOOR BLOWER
Nominal Airflow (Cfm)
Size (in.)
Motor HP (RPM)
RETURN-AIR FILTERS (IN,)*
Throwaway
024 048 060
2 4 5
289 418 430
7.8 t2,3 12.0
0.065 0.088 0.101
2...21 2...21 2.-21
11.9 19.4 19.4
2700 3300 3300
22 22 22
1/8 (825) 1/4 (1100) 1/4 (1100)
3...17 3...17 4_.17
3.7 5.6 5.6
800 1600 1750
I0x10 11x10 11x10
1/3 (1050) I/2 (1075) 1.0 (1040)
20x24x t 20x24x 1 24x36x 1 24x36x 1 24x36x 1 24x36x 1
030
2-1/2
312
8.4
0.070
2...21
13.6
2700
22
1/8 (825)
3...17
3.7
t000
10x10
i/3 (1o5o)
036 042
3 3-1/2
311 398
Scroll
10.9 t0.9
AccuRater '_
0.080 0.088
2-.21 2...21
15.5 19.4
2800 2800
22 22
1/8 (825) 1/8 (825)
3...17 3.-17
4.7 4.7
1200 1400
11x10 11x10
I/2 (1000) I/2 (1075)
*Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity
of 300 if/minute for throwaway type. For permanent fitters, follow filter manufacturer's recommendations for filter size based on allowable face velocity. Air filter
pressure drop for non-standard filters must not exceed 0.06 in. wg.
Table 2--Mininmm Airflow for Safe Electric Heater Operation (Cfm)
SiZE 024 030 036 042 048 060
Cfm 800 1000 1200 1400 1600 1750
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)
DISCHARGE
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before performing service or maintenance operations on the
system, turn off main power to unit and install lockout tag.
1. Open all electrical disconnects and install lockout tag before
starting any service work.
2. Removereturnductcoverlocatedon ductpanelbybreaking
four (4) connecting tabs with screwdriver and a hammer (see
Fig. 9 & 10).
3. To remove supply duct cover, break front and right side
connecting tabs with a screwdriver and a hammer. Push
louver down to break rear and left side tabs (see Fig. 9 & 10).
4. If unit ductwork is to be attached to vertical opening flanges
on the unit composite base (jackstand applications only), do
so at this time. Collect ALL screws that were removed. Do
not leave screws on rooftop, as permanent damage to the roof
may occur.
5. It is recommended that the unit base insulation around the
perimeter of the vertical return-air opening be secured to the
unit base with aluminum tape. Applicable local codes may
require aluminum tape to prevent exposed fiberglass.
6. Cover both horizontal duct openings with the duct cnvers
from the accessory duct cover kit. Ensure opening is air-and
watertight.
7. After completing unit conversion, perfornr all safety checks
and power up unit.
NOTE:The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation of
nonresidence-type air conditioning and ventilating systems, NFPA
90A or residence-type, NFPA 90B: and/or local codes and
ordinances.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Units are shipped for side shot installation.
2. Select and size ductwork, supply-air registers, and
return-air grilles according to American Society of Heating,
Refrigeration and Air Conditioning Engineers (ASHRAE)
recommendations.
3. Use flexible transition between rigid ductwork and unit to
prevent transmission of vibration. The transition may be
screwed or bolted to duct flanges. Use suitable gaskets to
ensure weathertight and airtight seal.
4. All units must 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.
5. Size all ductwork fnr maxinmm required airflow (either
heating or cooling) for unit being installed. Avoid abrupt
duct size increases or decreases or performance may be
affected.
6. Adequately insulate and weatherproof all ductwork located
outdoors. Insulate ducts passing through unconditioned
space, and use vapor barrier in accordance with latest issue
of SMACNA and ACCA minimum installation standards
for heating and air conditioning systems. Secure all ducts to
building structure.
7. Flash. weatherproof, and vibration-isolate all openings in
building structure in accordance with local cndes and good
building practices.
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