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Table 1—Physical Data 551B
BASE UNIT 551B 036 048 060 072
NOMINAL CAPACIT Y (n ominal tons)
3 4 5 6
OPERATING WEIGHT (lb)
Unit
435 445 465 540
Perfect Humidity Adaptive Dehumidification System
15 23 25 29
EconoMi$er IV
50 50 50 50
Roof Cu r b
115 115 115 115
COMPRESSOR
Scroll
Quantity
1 1 1 1
Oil (oz)
42 53 50 60
REFRIGERANT TYPE
R-22
Expansion Device
Acut rol Metering Device
Operating Charge (lb-oz)
Standard Unit
5-8 10-2 10-0 12- 8
Unit With Perfect Humidity Adaptive Dehumidification System
12-5 18-8 20-5 23-14
CONDENSER FAN
Propeller
Quantity...Diameter (in.)
1...22 1...22 1...22 1...22
Nominal Cfm
3500 3500 4100 4100
Motor Hp...Rpm
1
/8...825
1
/8...825
1
/
4
...1100
1
/
4
...1100
Watts Input (Total)
180 180 320 320
CONDENSER COIL
3/8--- in. OD Enhanced Copper Tubes, Aluminum Lanced Fins
Rows...Fins/in.
1...17 2...17 2...17 2...17
Total Face Area (sq ft)
14.6 16.5 16.5 21.3
EVAPORATOR COIL
3/8--- in. OD Enhanced Copper Tubes, Aluminum Double-Wavy Fins
Standard Unit
Rows...Fins/in.
2...15 2...15 4...15 4...15
Total Face Area (sq ft)
5.5 5.5 5.5 7.3
Unit with Perfect Humidity Adaptive Dehumid ification System
Rows...Fins/in.
1...17 2...17 2...17 2...17
Total Face Area (sq ft)
3.9 3.9 3.9 5.2
EVAPORATOR FAN
Centrifugal Type, Belt Drive
Quantity...Size (in.)
1...10 x 10 1...10 x 10 1...10 x 10 1...10 x 10
Nominal Cfm
1200 1600 2000 2400
Maximum Continuous Bhp Std
1.20
1.20 1.30/2.40* 2.40
Hi-Static
2.40
2.40 2.90 2.90
Motor Frame Size Std
48
48 56 56
Hi-Static
56
56 56 56
Fan Rpm Range Std
680-1044
770-1185 1035-1460/ 1035---1460* 1120-1585
Hi-Static
1075-1455
1075-1455 1300-1685 1300-1685
Motor Bearing Type
Ball Ball Ball Ball
Maximum Fan Rpm
2100 2100 2100 2100
Motor Pulle
y
Pitch Diameter
A
/
B
(
in.
)
Std
1.9/2.9
1.9/2.9 2.4/3.4 2.4/3.4
M
o
t
o
r
P
u
l
l
e
y
P
i
t
c
h
D
i
a
m
e
t
e
r
A
/
B
(
i
n
.
)
Hi-Static
2.8/3.8
2.8/3.8 3.4/4.4 3.4/3.4
Nominal Motor Shaft Diameter (in.) Std
1/
2
1
/
2
5
/
8
5
/
8
Hi-Static
5
/
8
5
/
8
7/
8
7
/
8
Fan Pull ey Pitch Diameter (in.) Std
4.5
4.0 4.0 3.7
Hi-Static
4.5
4.5 4.5 4.5
Belt — Type...Length (in.) Std
1...A...36
1...A...36 1....4...40 1...A...38
Hi-Static
1...A...39
1...A...39 1...A...40 1...A...40
Pulley Center Line Distance (in.)
10.0-12.4 10.0-12.4 14.7-15.5 14.7-15.5
S
p
eed Chan
g
e
p
er Full Turn o
f
Std
65
70 75 95
S
p
e
e
d
C
h
a
n
g
e
p
e
r
F
u
l
l
T
u
r
n
o
f
Movable Pulley Flange (rpm)
Hi-Static
65
65 60 60
Movable Pulle
y
Maximum Full
Std
5
5 6 5
M
o
v
a
b
l
e
P
u
l
l
e
y
M
a
x
i
m
u
m
F
u
l
l
Turns from Closed Position
Hi-Static
6
6 5 5
Factory Setting — Full Turns Open Std
3
3 3 3
Hi-Static
3
1
/
2
3
1
/
2
3
1
/
2
3
1
/
2
Factory Speed S etting (rpm) Std
826
936 1248 1304
Hi-Static
1233
1233 1396 1396
Fan Shaft Diameter at Pulley (in.)
5
/
8
5
/
8
5
/
8
5
/
8
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief
450 50
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 SCREENS
Cleanable. Screen q uantity and s ize varies with option selected.
RETURN-AIR FILTERS
Throwaway
Quantity...Size (in.)
2...16 x 25 x 2
2...16 x 16 x 2
LEGEN D
Bhp — Brake Horsepower
*Sin gle phase/three phase.
551B,C