Bryant 549B - Manual (Page 4)

— 4 —
A. Positioning
Maintain clearance around and above the unit to provide
proper airflow and service access. See Fig. 5.
Position the unit on the roof curb so that the following clear-
ances are maintained:
1 /
4
-in. clearance between the roof curb
and the base rails on each side and the duct side of unit;
3
5 /
16
-in. clearance between the roof curb and condenser side
of unit (see Fig. 1, section C-C).
Do not install the unit indoors. Do not locate the unit air inlet
near exhaust vents or other sources of contaminated air.
Although the unit is weatherproof, guard against water from
higher level runoff and overhangs.
After the unit is in position, remove the polyethylene ship-
ping wrapper and rigging skid.
Table 1 — Physical Data
LEGEND
BASE UNIT 549B 090 102 120
NOMINAL CAPACITY (tons) 7 1 / 2 8 1 / 2 10
OPERATING WEIGHT (lb)
Unit 870 1000 1000
EconoMi$er IV 75 75 75
Roof Curb 223 223 223
COMPRESSOR Scroll
Quantity 2 2 2
Oil (oz) (each compr) 57 70 57
REFRIGERANT TYPE R-22
Operating Charge (lb)
Circuit 1 9.5 11.0 10.7
Circuit 2 9.5 11.0 10.8
OUTDOOR FAN Propeller
Quantity...Diameter (in.) 2...22 2...22 2...22
Nominal Cfm 6500 6500 6500
Motor Hp...Rpm 1 /
4
...1100 1 /
4
...1100 1 /
4
...1100
OUTDOOR COIL Enhanced Copper Tubes, Aluminum Fins, Fixed Orifice Metering Device
Rows...Fins/in. 2...17 2...17 2...17
Total Face Area (sq ft) 20.5 25.1 25.1
INDOOR FAN Centrifugal Type
Quantity...Size (in.) Standard 1...15 x 15 1...15 x 15 1...15 x 15
High-Static 1...15 x 15 1...15 x 15 1...15 x 15
Type Drive Standard Belt Belt Belt
High-Static Belt Belt Belt
Nominal Cfm 3000 3400 4000
Maximum Continuous Bhp Standard 2.90 2.90 3.70
High-Static 4.20 4.20 5.25
Motor Frame Size Standard 56 56 56
High-Static 56 56 56
Nominal Rpm Standard 1725 1725 1725
High-Static 1725 1725 1725
Fan Rpm Range Standard 730-950 840-1085 860-1080
High-Static 860-1080 860-1080 830-1130
Motor Bearing Type Ball Ball Ball
Maximum Allowable Rpm 2100 2100 2100
Motor Pulley Pitch Diameter Min/Max (in.) Standard 3.4/4.4 3.4/4.4 4.0/5.0
High-Static 4.0/5.0 4.0/5.0 2.8/3.8
Nominal Motor Shaft Diameter (in.) Standard 7 / 8
7 / 8
7 / 8
High-Static 7 /
8
7 /
8
7 /
8
Fan Pulley Pitch Diameter (in.) Standard 8.0 7.0 8.0
High-Static 8.0 8.0 5.8
Belt, Quantity...Type...Length (in.) Standard 1...A...51 1...A...51 1...A...53
High-Static 1...A...53 1...A...53 1...BX...48
Pulley Center Line Distance (in.) Standard 16.75-19.25 16.75-19.25 15.85-17.50
High-Static 16.75-19.25 16.75-19.25 15.85-17.50
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Standard 45 45 45
High-Static 45 45 60
Movable Pulley Maximum Full
Turns from Closed Position
Standard 5 5 5
High-Static 5 5 6
Factory Setting Standard 5 5 5
High-Static 5 5 5
Factory Speed Setting (rpm) Standard 730 840 860
High-Static 860 860 887
Fan Shaft Diameter at Pulley (in.) 1 1 1
INDOOR COIL Enhanced Copper Tubes, Aluminum Double-Wavy Fins,
Acutrol Metering Device
Rows...Fins/in. 3...15 4...15 4...15
Total Face Area (sq ft) 8.9 11.1 11.1
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief 625
Cutout 428
Reset (Auto.) 320
LOSS-OF-CHARGE/LOW-PRESSURE SWITCH (Liquid Line) (psig)
Cutout 7 ± 3
Reset (Auto.) 22 ± 5
FREEZE PROTECTION THERMOSTAT
Opens (F) 30
Closes (F) 45
OUTDOOR-AIR INLET SCREEN Cleanable. Screen size and quantity vary by option selected.
RETURN-AIR FILTERS Throwaway
Quantity...Size (in.) 4...16 x 20 x 2 4...20 x 20 x 2
Bhp — Brake Horsepower