Instruction manual

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 1 and 2.
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 3 and 4. 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) 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 accord-
ing to good construction practices.
A. CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE UNITS
WARNING: Before performing service or maintenance
operations on system, turn off main power to unit and
install lockout tag. Turn off accessory heater power
switch if applicable. Electrical shock could cause serious
injury or death.
1. Open all electrical disconnects and install lockout tag before
starting any service work.
2. Remove side duct covers to access bottom return and supply
knock outs.
NOTE: These panels are held in place with tabs similar to an
electrical knockout.
3. Use a screwdriver and hammer to remove the panels in the
bottom of the composite unit base.
4. Ensure the side duct covers are in place to block off the
horizontal air openings.
NOTE: Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
VI. PROVIDE FOR CONDENSATE DISPOSAL
NOTE: Ensure that condensate-water disposal methods comply
with local codes, restrictions, and practices.
The units dispose of condensate through a 3/4 in. NPT female
fitting that exits on the compressor end of the unit. Condensate
water can be drained directly onto the roof in rooftop installations
Fig. 4—Corner Weights (in Pounds)
CORNER WEIGHTS (SMALL CABINET) CORNER WEIGHTS (LARGE CABINET)
Model 601A
Unit 18 24 30 36 42
Model 601A
Unit 48 60 —
Total Weight 283 289 287 291 323 Total Weight 353 418 —
Corner Weight 1 65 67 66 67 83 Corner Weight 1 76 90 —
Corner Weight 2 53 56 54 55 55 Corner Weight 2 49 58 —
Corner Weight 3 61 62 62 63 78 Corner Weight 3 96 114 —
Corner Weight 4 103 104 105 106 107 Corner Weight 4 132 156 —
CORNER WEIGHTS (Small Cabinet) CORNER WEIGHTS (Large Cabinet)
Model 602A
Unit 24 30 36 — —
Model 602A
Unit 42 48 60
Total Weight 299 320 328 — — Total Weight 350 375 428
Corner Weight 1 63 63 64 — — Corner Weight 1 75 81 92
Corner Weight 2 62 74 76 — — Corner Weight 2 49 52 60
Corner Weight 3 56 56 58 — — Corner Weight 3 95 102 116
Corner Weight 4 118 127 130 — — Corner Weight 4 131 140 160
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