Horizontal and Vertical Steam/Hot Water Unit

HCV-15
HYDRONIC
HEATING
EQUIPMENT
Application Manual
HORIZONTAL AND VERTICAL
STEAM/HOT WATER
UNIT HEATERS
Contents
PAGE
Sterlings's horizontal steam/hot water unit heaters are
available in a range of outputs and airflows allowing almost
unlimited flexibility in job design.
APPLICATION OF UNIT HEATERS
2
HORIZONTAL UNIT HEATERS
Steam Performance Data
Steam Calculation and Correction Factors
Hot Water Performance Data
Hot Water Calculation and Correction Factors
Technical Data
Mounting Heights and Throws
Dimensional Data
Standard Specifications
3
4
5
6
7
8
9
10
11
SERPENTINE COIL DIMENSIONAL DATA
Serpentine Specification
12
12
• Select lower CFM models for lower mounting heights and
heavily occupied areas.
MOTOR CHARACTERISTICS - HORIZONTAL MODELS
13
VERTICAL UNIT HEATERS
Steam Performance Data
Steam Calculations and Correction Factors
Hot Water Performance Data – Standard Output
Hot Water Performance Data – Low Output
Hot Water Calculations and Correction Factors
Dimensional Data
Mounting Heights and Throws
Motor Characteristics
14
15-16
17
18-19
20-21
22
23
24
25
• The higher a unit must be located, the more CFM is
required to get the heat down to the occupied zone.
PIPING AND INSTALLATION
HORIZONTAL AND VERTICAL MODELS
26
The following points offer some basic guidelines and
suggestions which will be helpful in designing any job
using horizontal steam/hot water unit heaters:
• Always direct airflow to areas of greatest heat loss.
• Adjust throw length with horizontal louvers.
• Use horizontal and vertical louvers for complete
directional control of airflow.
• Mount units at the lowest practical and allowable level.
• More, smaller units will provide better heat distribution
than fewer larger ones.
• Watch final air temperatures on units mounted at lower
levels or in heavily occupied areas to insure that air
is warm enough to avoid drafts being felt.
• On motors with variable speed control use lower CFM rating
for design base.
• Watch sound ratings.
WIRING DIAGRAMS
HORIZONTAL AND VERTICAL MODELS
27
WARRANTIES AND TERMS OF SALE
27
MODEL NUMBER DESCRIPTION
28
Application of Unit Heaters
FIG. A. Typical arrangement of unit
heaters in manufacturing plant,
showing air flow patterns. Not to
scale.
The proper choice and placement of a unit heater with
regard to building type (architecturally) and application
(area use) are two criteria, the importance of which cannot
be overemphasized.
A narrow area with two exposed
walls either with or without
roof exposure.
The first step in the design of a job is typically to determine
the heat loss before considering CFM, final air temperature
and quantity and location of units. ASHRAE and others
publish the basic methodology used in calculating the
building or area's heat loss.
Two requirements which not only affect the heat loss
calculation but every other step of the job as well, are a
detailed knowledge of the building's construction and its
planned usage. The number of people, types of equipment
and daily activities therein should be a strong guiding factor
in the overall design.
2
A large square area with
exposed walls and roof; units
are blanketing all exposed
surfaces.
A small area with exposed
walls requiring one unit.
Horizontal Unit Heaters Construction and Features
MOTORS
115 volt, single speed motors are standard. Most models can
be supplied with single phase, explosion proof motors. For
standard motors in 230 volt or three-phase configuration,
and three-phase explosion-proof motors, see page 13 for
availability.
FAN GUARDS
All models with standard (non-explosion-proof )
single phase 115 or 230 volt motors utilize a wire fan guard
as a motor mount. OSHA type fan guards are standard on all
serpentine coil models and header type models 18 through
48 equipped with single phase, standard motors only. On
header type models 60 through 360, OSHA type fan guards
can be added as an optional accessory when equipped
with a single phase, standard motor only. Horizontal unit
heaters with OSHA fan guards can be installed in residential
applications. All models with three-phase or explosion-proof
motors are shelf-mounted and standard fan guards can be
added as an optional accessory.
Figure 1
Figure 2
HORIZONTAL AND VERTICAL LOUVERS
Horizontal louvers are standard on all models. Vertical
louvers are an optional accessory on all models. Vertical
louvers are installed on built to order units or shipped loose
for field installation.
THERMOSTATS
Three, line voltage wall thermostats are in stock for
immediate shipment. All models operate in a 45 to 85°F
(7 to 28°C) range. Standard duty model with “off-auto”
and heavy duty models with “auto-off-fan” switching
are available. Other models available on request. Plastic
tamperproof one size fits all thermostat guards are also
available.
STRAP-ON WATER CONTROL
A SPDT strap-on type hot water control with 100° to 240°F
(38 to 116°C) rated at 10 amps at 120V is also available.
Control can be used for direct or reverse acting applications
as a high or low limit.
STEAM PRESSURE CONTROL
SPST switch opens on a rise in pressure. Control is automatically reset, has a range of 0 to 15 PSIG (0 to 103 KPa) and
has an adjustable differential. Other actions, ranges, circuits
and manual reset models are available on request.
MANUAL STARTERS
Single and three-phase models are available. Standard
models are single-speed, toggle-operated, NEMA Type 1
and are surface-mounted.
WALL MOUNTED SPEED CONTROLLERS
Units up to HS108 and VS104 with standard motors (115V)
can be operated at reduced speeds by addition of optional
speed controller. Controller is 5 amps, pre-set at factory for
maximum and minimum speeds, with intermediate speeds
infinitely controllable. All 1/3, 1/2 H.P. and 230V motors
operate only at rated speed and CFM – See performance data
charts.
3
Horizontal Unit Heaters
Steam Performance Data — Table 1
Performance based on 2# steam pressure at heater with air entering @ 60°F.
Max. Working Pressure 150 PSI, 366°F**
Model
No.
HS-18
HS-24
HS-36
HS-48
HS-60
HS-72
HS-84
HS-96
HS-108
HS-120
HS-132
HS-144
HS-156
HS-180
HS-204
HS-240
HS-280
HS-300
HS-360
Output
BTU/
HR*
Cond.
lbs./hr.
Sq. Ft.
E.D.R.
Final
Air
°F
18,000
16,200
24,000
21,600
36,000
32,400
48,000
43,200
60,000
54,000
72,000
64,800
84,000
75,600
96,000
86,400
108,000
97,200
120,000
—
132,000
—
144,000
—
156,000
—
180,000
—
204,000
—
240,000
—
280,000
—
300,000
—
360,000
—
18.0
16.2
24.5
22.0
37.0
33.0
49.0
44.0
61.0
55.0
73.0
66.0
85.0
76.0
97.0
88.0
110.0
98.0
122.0
—
134.0
—
146.0
—
160.0
—
190.0
—
208.0
—
244.0
—
280.0
—
310.0
—
366.0
—
75
68
100
90
150
135
200
180
250
225
300
270
350
315
400
360
450
405
500
—
550
—
600
—
650
—
770
—
850
—
1000
—
1100
—
1250
—
1500
—
102
105
109
112
119
120
119
123
121
131
120
123
115
123
123
132
115
120
118
—
121
—
120
—
115
—
135
—
124
—
123
—
121
—
117
—
120
—
Motor
HP
16 Watt
16 Watt
25 Watt
1/20
1/20
1/20
1/12
1/12
1/12
1/3
1/3
1/3
1/3
1/3
1/3
1/3
1/2
1/2
1/2
RPM
Nominal
CFM
Outlet
FPM
Nom.
Amps
@
115VAC†
1550
1350
1550
1350
1550
1350
1000
900
1000
900
1000
900
1000
900
1000
900
1000
900
1140
—
1140
—
1140
—
1140
—
1140
—
1140
—
1140
—
1100
—
1100
—
1100
—
395
330
450
380
550
480
750
630
900
700
1100
950
1400
1100
1400
1100
1800
1500
1900
—
2000
—
2200
—
2600
—
2200
—
2900
—
3500
—
4200
—
5000
—
5500
—
395
330
450
380
550
480
550
460
650
510
800
700
900
750
930
800
1000
900
900
—
950
—
1000
—
1150
—
800
—
1000
—
900
—
980
—
700
—
1000
—
.80
.80
.80
.80
1.2
1.2
1.4
1.4
1.4
1.4
1.4
1.4
2.2
2.2
2.2
2.2
2.2
2.2
4.5
—
4.5
—
4.5
—
4.5
—
4.5
—
4.5
—
4.5
—
5.4
—
5.4
—
5.4
—
* For the lower output, an optional Speed Controller must be ordered.
For Sound Ratings See Pages 6 & 8.
** For further information see page 11, COIL MODELS.
† Stated AMP is full load (FLA). AMP draw varies by motor manufacturer ± .2 AMPS. See page 13 for motor data.
4
Nom.
Fan
Diam.
(Inches)
9
9
10
10
10
10
12
12
12
12
14
14
14
14
16
16
16
16
18
—
18
—
18
—
18
—
18
—
18
—
20
—
20
—
24
—
24
—
Horizontal Unit Heaters Steam Calculations
and Correction Factors
EXAMPLE: –
UNIT: ____________ HS-24
Steam Pressure ____ 10 PSI
Entering Air Temp. ____40°F
I.
CAPACITY
A. For 2 lbs. steam, 60° entering air
Read output directly from Table 1, 24,000 BTU/HR.
(Ref., Std. HS-24).
B. For higher steam pressures
and/or E.A.T.'s above or below 60°F
Multiply output from Table 1 by appropriate correction
factor from Table 2 (below).
II. FINAL AIR TEMPERATURE
A. For 2 lbs. steam, 60° entering air
24,000 x 1.29 = 30,960 BTU/HR.
Read temperature directly from Table 1, 109°F.
(Ref., Std. HS-24).
B. For capacities calculated in I.B. (above)
III. FINAL AIR VOLUME
A. For 2 lbs. steam, 60° entering air
Output from I.B.
+ E.A.T. = Final Air Temp.
1.085 x CFM from Table 1
460 + Final Air Temp from Table 1 x
530
B. For final air temperatures calculated
In II. B. (above)
IV. CONDENSATE PER HOUR
A. For 2 lbs. steam, 60° entering air
460 + Final Air Temp from II.B.
530
x
30,960 + 40 =103.4°F.
1.085 x 450
Nom. CFM
Final
from
=
Air
Table 1
Volume
460+109 x 450 =483 CFM
530
Nom. CFM
Final
from
=
Air
Table 1
Volume
460+103.4 x 450 = 478 CFM
530
Read lbs. per hour from Table 1, 24.5 LBS./HR.
(Ref., Std. HS-24).
B. For capacities calculated in I.B. (above)
Output from I.B.
= lbs. per hour of condensate
Latent Heat From Table 3
30,960 = 32.5 LBS./HR.
953
Table 2 — STEAM CORRECTION FACTORS BASED ON 2 LBS. STEAM 60° E.A.T.
STEAM PRESSURE — LBS. PER SQ. IN. (SATURATED)
ENTERING AIR
TEMPERATURE
30°
40°
50°
60°
70°
80°
90°
100°
2
5
10
15
20
30
40
50
75
100
125
150
1.19
1.11
1.03
0.96
1.24
1.16
1.08
1.00
1.29
1.21
1.13
1.05
1.38
1.29
1.21
1.13
1.44
1.34
1.28
1.19
1.50
1.42
1.33
1.25
1.60
1.51
1.43
1.35
1.68
1.60
1.51
1.43
1.70
1.60
1.58
1.50
1.90
1.81
1.72
1.64
2.02
1.93
1.84
1.75
2.11
2.02
1.93
1.84
2.20
2.11
2.02
1.93
0.88
0.81
0.74
0.67
0.93
0.85
0.78
0.71
0.97
0.90
0.83
0.76
1.06
0.98
0.91
0.84
1.12
1.04
0.97
0.89
1.17
1.10
1.02
0.95
1.27
1.19
1.12
1.04
1.35
1.27
1.19
1.12
1.42
1.34
1.26
1.19
1.55
1.47
1.39
1.32
1.66
1.58
1.50
1.42
1.76
1.68
1.59
1.51
1.84
1.76
1.67
1.59
0
Table 3 — PROPERTIES OF SATURATED STEAM
STEAM PRESSURE IN LBS. PER SQUARE INCH GAUGE
0
Steam
Temperature-°F
Latent Heat
of Steam
2
5
10
15
20
30
40
50
75
100
125
150
212.0
218.5
227.1
239.4
249.8
258.8
274.0
286.7
297.7
319.9
337.9
352.9
365.9
970
966
961
953
946
940
929
920
912
891
881
868
857
5
Horizontal Unit Heaters
Hot Water Performance Data — Table 4
Performance based on 200° EWT, 60° E.A.T., 20° TD.
Model
No.
HS-108A
HS-118A
HS-125A
HS-136A
HS-18
HS-24
HS-36
HS-48
HS-60
HS-72
HS-84
HS-96
HS-108
HS-120
HS-132
HS-144
HS-156
HS-180
HS-204
HS-240
HS-280
HS-300
HS-360
Output
BTU/
HR*
8,030
6,800
18,400
15,650
24,800
21,230
35,900
32,300
13,050
11,725
17,400
15,600
26,100
23,500
34,800
31,300
43,600
39,200
52,300
47,000
61,000
54,900
69,700
62,700
78,400
70,500
87,100
—
95,800
—
104,000
—
113,000
—
118,000
—
148,100
—
174,000
—
209,100
—
230,000
—
261,300
—
GPM
.80
1.9
2.5
3.6
1.3
1.8
2.7
3.5
4.4
5.3
6.1
7.0
7.9
8.8
9.6
10.4
11.3
11.8
14.9
17.4
21.0
23.0
26.2
Final
Air
°F
91
90
94
96
102
106
99
100
95
99
96
98
103
103
103
111
105
112
104
106
100
106
106
113
100
103
102
—
104
—
104
—
100
—
110
—
107
—
106
—
106
—
102
—
103
—
Pressure
Drop
FT./H2O
Motor
HP
.80
16 Watt
2.2
16 Watt
2.2
25 Watt
3.0
1/20
.005
16 Watt
.014
16 Watt
.09
25 Watt
.12
1/20
.17
1/20
.23
1/20
.24
1/12
.29
1/12
.36
1/12
.39
1/3
.41
1/3
.43
1/3
.53
1/3
.60
1/3
.79
1/3
1.06
1/3
1.33
1/2
2.1
1/2
2.1
1/2
RPM
Nominal
CFM
Outlet
FPM
1550
1350
1550
1350
1550
1350
1000
900
1550
1350
1550
1350
1550
1350
1000
900
1000
900
1000
900
1000
900
1000
900
1000
900
1140
—
1140
—
1140
—
1140
—
1140
—
1140
—
1140
—
1100
—
1100
—
1100
—
245
210
500
420
580
460
850
750
395
350
450
380
550
480
750
630
900
700
1100
950
1400
1100
1400
1100
1800
1500
1900
—
2000
—
2200
—
2600
—
2200
—
2900
—
3500
—
4200
—
5000
—
5500
—
250
215
500
420
590
450
550
480
395
350
450
380
550
480
550
460
650
510
800
700
900
750
930
800
1000
900
900
—
950
—
1000
—
1150
—
800
—
1000
—
900
—
980
—
700
—
1000
—
Nom.
Amps
@
115VAC†
.8 0
.8 0
.8 0
.8 0
1.2
1.2
1.4
1.4
.8 0
.8 0
.8 0
.8 0
1.2
1.2
1.4
1.4
1.4
1.4
1.4
1.4
2.2
2.2
2.2
2.2
2.2
2.2
4.5
—
4.5
—
4.5
—
4.5
—
4.5
—
4.5
—
4.5
—
5.4
—
5.4
—
5.4
—
For the lower output, an optional Speed Controller must be ordered.
For Fan Diameter See Page 4.
† Stated AMP is full load (FLA). AMP draw varies by motor manufacturer ± .2 AMPS. See page 13 for motor data.
6
Sound
Rating
II
I
II
I
II
I
II
I
II
I
II
I
II
I
II
I
II
I
II
I
III
II
III
II
III
II
III
—
IV
—
IV
—
IV
—
III
—
IV
—
IV
—
IV
—
IV
—
IV
—
Horizontal Unit Heaters Hot Water Calculations
and Correction Factors
EXAMPLE: –
UNIT: ___________________________ HS-24
Entering Water Temp. _______________160°F
Entering Air Temp. ___________________40°F
Water Temperature Drop ______________10°F
I.
CAPACITY @ 20° TD:
A. For 200° EWT, 60° EAT
Read output directly from Table 4,
17,400 BTU/HR (Ref., Std. HS-24).
B. For EWT and/or EAT above
or below Standard
Multiply output from Table 4
by factor from Table 5 (below).
17,400 x .878 = 15,277 BTU/HR.
II. CAPACITY AT OTHER TD's
A. For TD's from 5 to 60°F
Multiply output obtained in IA. or IB.
(above) by appropriate factor from Table 6
(below)
IA - 17,400 x 1.15 = 20,010 BTU/HR.
– OR –
IB - 15,277 x 1.15 = 17,569 BTU/HR.
III. GPM AT OTHER TD's
A. For TD's from 5 to 60°F
Multiply GPM of unit for 20° TD, from Table 4
by appropriate factor from Table 6 (below).
1.8 x 2.30 = 4.14 GPM (Applies only to units with
Std. 200° EWT, 60° EAT.) For all others calculate
BTU
using formula – GPM =
500 x TD
IV. CAPACITY AT OTHER RATES
OF WATER FLOW
Multiply output from Table 4 by factor
from Table 8 (below).
V. PRESSURE LOSS AT OTHER TD's
A. For TD's from 5 to 60°F
Multiply P.D. of unit for 20° TD, from Table 4
by appropriate factor from Table 6 (below).
.014 x 5.00 = .07 Ft. H2O
Table 5 — HOT WATER CONVERSION FACTORS BASED ON 200° ENTERING WATER
60° ENTERING AIR 20° TEMPERATURE DROP
ENTERING AIR
ENTERING WATER TEMPERATURE — 20° WATER TEMPERATURE DROP
TEMPERATURE
30°
40°
50°
60°
70°
80°
90°
100°
100°
0.518
0.439
0.361
0.286
0.212
0.140
0.069
0
120°
0.666
0.585
0.506
0.429
0.353
0.279
0.207
0.137
140°
0.814
0.731
0.651
0.571
0.494
0.419
0.345
0.273
160°
0.963
0.878
0.796
0.715
0.636
0.558
0.483
0.409
180°
1.120
1.025
0.941
0.857
0.777
0.698
0.621
0.546
200°
1.268
1.172
1.085
1.000
0.918
0.837
0.759
0.682
220°
1.408
1.317
1.231
1.143
1.060
0.977
0.897
0.818
240°
1.555
1.464
1.375
1.286
1.201
1.117
1.035
0.955
280°
1.850
1.755
1.663
1.571
1.483
1.397
1.311
1.230
260°
1.702
1.609
1.518
1.429
1.342
1.257
1.173
1.094
300°
1.997
1.908
1.824
1.717
1.630
1.545
1.462
1.371
Table 6 — HOT WATER BTU, GPM AND PRESSURE LOSS FACTORS BASED ON STANDARD
CONDITIONS OF 200°F ENTERING WATER 60°F ENTERING AIR & 20°F WATER DROP
TEMPERATURE DROP °F
USE FACTORS FROM THIS TABLE TO OBTAIN
APPROXIMATE RESULTS
5
To obtain BTU for other Water Temperature Drops,
multiply basic BTU rating by applicable Factor.
To obtain GPM for other Water Temperature Drops,
multiply basic GPM rating by applicable Factor.*
To obtain Pressure Loss Feet of Water for other
temperature Drops, multiply Basic loss at 20° drop by
Factor.
10
15
20
25
30
40
50
60
1.25
1.15
1.08
1.00
.94
.90
.83
.76
.72
5.00
2.30
1.44
1.00
.74
.59
.40
.30
.24
10.00
5.00
2.00
1.00
.60
.40
.20
.13
.07
*Table 7 — MINIMUM WATER FLOW — GPM
MODEL No.
MIN. GPM
HS108A
.125
HS118A
.125
HS125A
.125
HS136A
.125
HS18
.75
HS24
1.24
HS36
1.24
HS48
1.49
HS60
1.49
HS72
1.62
HS84
1.86
MODEL No.
MIN. GPM
HS108
3.35
HS120
3.60
HS132
4.09
HS144
4.09
HS156
4.09
HS180
4.34
HS204
4.34
HS240
4.59
HS280
4.59
HS300
6.08
HS360
6.08
HS96
3.35
*Table 8 — HEATING CAPACITY FACTORS FOR VARIOUS RATES OF WATER FLOW
% of Rated Water Flow
Btu/Hr Heating Capacity
25%
.80
50%
.89
75%
.96
100%
1.00
125%
1.04
150%
1.07
175%
1.10
7
Horizontal Unit Heaters Technical Data
The performance data listed on page 6
includes sound ratings. The ratings provide
a guide in determining the acceptable
degree of loudness in particular occupancy
situations.
Certain general rules apply to specific
selection of unit heaters with regard to
degree of quietness (or loudness);
• The greater the fan diameter, the higher
the sound level.
• The higher the motor RPM, the higher
the sound level. Note that on most
units the lower the speed mode
results in lowering the sound rating
one increment.
• Selecting a larger number of smaller
units generally results in lower overall
noise levels than fewer large units.
All horizontal steam and hot water unit
heater motors, whether fan guard or
shelf-mounted, are isolated from the
mechanical mount by resilient isolators.
This mounting along with balanced fan
blades and excellent overall construction
integrity, assures you the utmost in quiet
operation.
CATEGORY OF AREA
SOUND RATING
Apartment, assembly hall, classrooms
churches, courtrooms, executive offices,
hospitals, libraries, museums, theatres.
I
Dining rooms, general offices, recreation
areas, small retail stores.
II
Restaurants, banks, cafeterias, department
stores, public buildings, service stations.
III
Gymnasiums, health clubs,
laundromats, supermarkets.
IV
Garages, small machine shops, light
manufacturing.
V
Factories, foundries, steel mills.
III - VII*
*Depending on specific use in these
facilities, size of operation, etc.
The following table outlines sound
ratings for various applications. The lower
the number, the quieter the unit and the
lower the sound requirement.
CORRECTIONS WHEN USING GLYCOL SOLUTION IN SYSTEM
Propylene
Glycol
1. Heat transfer @180°F
with no increase in
flow rate
20% solution
.97*
50% solution
.90*
2. G.P.M. Req'd. @180°F, 20° Δ t
(no correction to pump curve)
Propylene
Glycol
7. Freezing Point 55% by volume
50%
40%
30%
20%
-28°F
-13°F
+ 4°F
+17°F
1.10%*
*Compared to water.
3. Pump Head Req'd. @180°F w/increase
in G.P.M.
4. Specify gravity (water = 1.0)
1.23%*
1.045-1.055*
5. Pounds/Gallons @60°F
(water = 8.3453 Pound/Gallon)
8.77
6. pH @ 50% by volume
9.5
8
Approximate factors at varying altitudes
Altitude
Sea level - 1000 ft.
1000 ft. - 3000 ft.
3000 ft. - 5000 ft.
5000 ft. - 7000 ft.
7000 ft. - 10000 ft.
Factor
1.00
.958
.929
.900
.871
Horizontal Unit Heaters
Mounting Heights and Throws — Table 9
MODEL
NO.
MAXIMUM
MOUNTING HT.
APPROX. MAX.
THROW
MODEL
NO.
MAXIMUM
MOUNTING HT.
APPROX. MAX.
THROW
HS-108A
8
20
HS-108
11
40
HS-118A
8
25
HS-120
12
40
HS-125A
9
29
HS-132
13
54
HS-136A
9
29
HS-144
13
55
HS-18
8
20
HS-156
13
55
HS-24
8
24
HS-180
13
53
HS-36
9
28
HS-204
13
55
HS-48
9
30
HS-240
14
57
HS-60
10
30
HS-280
14
57
HS-72
10
29
HS-300
15
58
HS-84
10
30
HS-360
15
60
HS-96
11
38
This table is based on 60° entering air
and either 2 lb. steam or 200° water
with a 20° T.D. The data is based on
the higher speed CFM throughout
and velocity. Care should be exercised
in locating adjacent unit heaters and
allowance should be made for obstructions in the air pattern and conflicting air
currents from other air moving devices.
Figure 3
H
MAXIMUM DISTANCE OF THROW = T
9
Horizontal Unit Heaters Dimensional Data
Figure 4
Table 10 - MODELS HS-18 THRU 360 (HEADER TYPE)
MODEL
A
B
C
D
HS-18
HS-24
HS-36
HS-48
HS-60
HS-72
HS-84
HS-96
HS-108
HS-120
HS-132
HS-144
HS-156
HS-180
HS-204
HS-240
HS-280
HS-300
HS-360
145/8
75/16
15
145/8
75/16
E
NO.
OF
LOUVERS
NOM.
FAN
DIAM.
APPROX.
SHIP
WT.
91/2 11/4 21/4 127/8
4
9
26
121/4 121/2 11/4 21/4 127/8
5
10
30
153/8
153/8
165/8
191/8
6
6
7
8
12
12
14
14
41
41
44
47
71/2 1313/16 171/4 171/2 11/2 13/4 177/8
8
16
49
181/2 183/4 11/2 13/4 191/8
8
18
59
G*
H*
J
71/2
61/8 215/16 31/4
93/8
121/4
18
9
61/8 215/16 31/4
93/8
171/8 8 9/16
171/8 8 9/16
183/8 93/16
207/8 109/16
201/2
201/2
213/4
241/4
101/4
101/4
107/8
121/8
195/8 913/16
24
12
57/8
57/8
6
61/8
F
215/16
215/16
215/16
215/16
65/16 33/16
511/16
51/16
51/16
511/16
K
117/16 143/4
15
1015/16 143/4
15
1
11 /16 16
161/4
13
1
11 /16 18 /2 183/4
L
11/4
11/4
11/4
11/4
M
13/4
13/4
13/4
13/4
N
207/8 107/16 251/4 125/8 65/16 33/16 611/16
13
233/8 1111/16 273/4 137/8 65/16 33/16
14
21
211/4 11/2 13/4 215/8
9
18
74
233/8 1111/16 273/4 137/8 65/16 33/16 77/16
133/4
21
211/4 11/2 13/4 215/8
9
18
74
245/8 125/16
75/8
141/2
63/8
33/16 77/16
133/4 221/4 221/2 11/2 13/4 227/8
9
18
90
277/8 1315/16 301/4 151/8
277/8 1315/16 301/4 151/8
81/8
81/8
33/16
33/16
57/8
95/8
14
251/2 233/4
3
17 /4 251/2 233/4
2 13/4 261/8
2 13/4 261/8
10
10
20
20
143
154
333/8 1611/16 373/4 187/8
9
33/16
95/8
185/8
2 13/4 315/8
13
24
203
29
31
311/4
* APPLIES TO STANDARD MOTOR WITH STANDARD FAN GUARD. WHEN OPTIONAL MOTORS OR OSHA FAN GUARDS ARE REQUESTED,
DIMENSIONS WILL CHANGE ACCORDING TO THE SUBSTITUTIONS MADE.
NOTES: 1. OSHA guard standard on models HS-18 through HS-48 with single phase, standard motors only (dimensions shown in table).
2. Standard motor and standard guard shown.
3. Optional OSHA guards available for all units with standard 1 phase motors.
4. All 3 phase and explosion proof motors are shelf mounted.
10
Horizontal Unit Heaters Specifications
GENERAL
Furnish and install, where indicated or scheduled on plans
Sterling Model HS horizontal steam/hot water unit heaters.
Unit shall be equipped as specified herein. All units shall be
installed in a neat and workmanlike manner in accordance
with this specification and the manufacturer's installation
instruction.
CASING
Casings shall be 20 gauge die-formed steel. Casing
substrates shall be prepared for finishing with a hot wash,
iron phosphatizing clear rinse, chromic acid rinse and oven
drying. Paint finish shall be of lead-free, chromate free, alkyd
melamine resin base and applied with an electrostatic twopass system. Finish shall be baked at 350°F.
COIL MODELS 18 – 360
Coil elements and headers shall be of heavy wall drawn
seamless copper tubing. Element tubes shall be brazed into
extruded header junctions. Pipe connection saddles shall be
of cast bronze. Aluminum fins shall have drawn collars to
assure permanent bond with expanded element tubes and
exact spacing. All Element Assemblies are submersion tested
at factory at 200 P.S.I., and are rated at 150 pounds of
saturated steam pressure at 366°F, under maximum load
conditions. We recommend operating pressure of 75 P.S.I.
at 320°F for long life.
MOTORS
Motors shall be totally enclosed, resilient mounted with
class “B” windings. All motors shall be designed for
horizontal mounting. Motors under 1/3 H.P. are totally
enclosed, frame mounted, 115/1/60 with thermal overload
protection and permanently lubricated sleeve bearings with
optional solid state speed controller available. 1/3 H.P.
(115/1/60) motors are open frame construction, with
thermal overload protection and ball bearings. 1/3 H.P.
at (230V) and 1/2 H.P. (230V) motors are open frame
construction, with thermal overload protection and ball
bearings. 1/3 and 1/2 H.P. motors are available in single
and 3 phase in open frame construction or explosion-proof
housings, all the above are available as options.
EXPLOSION PROOF MOTORS
An enclosed motor whose enclosure is designed and
constructed to withstand an explosion of a specific gas or
vapor which may occur within the motor and to prevent the
ignition of this gas or vapor surrounding the machine.
Sterling motors comply with the National Electrical Code
classification as follows:
Class I, Group D; all sizes
Class II, Group F; all sizes
Class II, Group G; all sizes
Division I & II Installations
T-code (T3B)
Explosion proof equipment is not generally available for
Class I, Groups A and B and it is necessary to isolate motors
from the hazardous area. All explosion proof motors are
shelf mounted.
FANS
Fans shall be of the aluminum blade, hub type designed and
balanced to assure maximum air delivery, low motor horsepower requirements and quiet operation. Blades are spark
proof.
FAN GUARDS
Fan guards shall be welded steel, zinc plated or painted. To
meet ETL and OSHA requirements, units mounted below 8
feet from floor must be equipped with an OSHA fan guard.
OSHA fan guards are standard on coil models 18 through
48 and optional on coil models 60 through 360 with single
phase, standard motors only.
AIR DEFLECTION LOUVERS
Units shall be equipped with horizontal, individually
adjustable louvers. Vertical louvers for four-way air control
shall be available as an optional extra.
11
Serpentine Coil Horizontal Unit Heaters
Dimensional Data
Figure 5
Table 11 - STANDARD SPECIFICATION
MODEL
NO.
H
W
HS-108A
16
18
167/32 111/4
41/4
HS-118A
16
18
167/32 111/4
41/4
HS-125A
16
18
167/32 111/4
41/4
HS-136A*
181/2
A
B
C
201/2 1823/32 133/4
511/16
NO.
LOUVERS
NOM.
FAN
DIAM.
APPROX.
SHIP
WT.
HS-108A
5
9
22
HS-118A
5
10
24
HS-125A
5
10
25
HS-136A*
6
12
31
MODEL
NO.
* DIMENSION “C” IS TO BACK OF MOTOR, NOT MOTOR
CONDUIT CONNECTOR AS SHOWN ABOVE.
NOTE: Motors are totally enclosed, thermally protected, sleeve
bearing, with 2" (h) x 4" (w) conduit connection boxes. Nutserts
are attached to enclosure for balanced hanging.
NOTE: OSHA type fan guard standard on models HS-108A
through HS-136A.
Serpentine Coil Horizontal Unit Heaters Specifications
GENERAL
Furnish and install, where indicated
or scheduled on plans Sterling Model
HS-A horizontal hot water unit heaters.
Unit shall be equipped as specified
herein. All units shall be installed in
a neat and workmanlike manner in
accordance with this specification
and the manufacturer's installation
instruction.
CASING
Casings shall be 20 gauge die-formed
steel. Casing substrates shall be
prepared for finishing with a hot wash,
iron phosphatizing clear rinse, chromic
acid rinse and oven drying. Paint finish
shall be of lead-free, chromate free,
alkyd melamine resin base and applied
with an electrostatic two-pass system.
Finish shall be baked at 350°F.
12
COIL MODELS HS108A – HS136A
Coil is a serpentine design with
seamless copper tubing. Aluminum
fins shall have drawn collars to assure
permanent bond with expanded tubes.
Tubing connection shall be 3/8 inch
copper tubing, type “M” (.500 O.D.).
Coils shall be factory tested at
200 P.S.I.
MOTORS
Motors shall be totally enclosed,
resilient mounted with class “B”
windings. All motors shall be
designed for horizontal mounting.
FANS
Fans shall be of the aluminum blade
type, designed and balanced to
assure maximum air delivery, low
motor horsepower requirements
and quiet operation.
OSHA FAN GUARDS
OSHA fan guards shall be welded steel,
zinc plated or painted. OSHA fan guards
are standard on all models.
AIR DEFLECTION LOUVERS
Units shall be equipped with horizontal,
individually adjustable louvers.
Horizontal Unit Heaters Motor Characteristics
Table 13 - EXPLOSION PROOF WITH THERMAL OVERLOAD
MOTOR TYPE
Table 12 - TOTALLY ENCLOSED
MOTOR TYPE
HS Unit
Model
No.
18, 24,
108A, 118A
136A
36, 125A
48, 60, 72
84, 96, 108
120, 132,
144, 156,
180, 204, 240
280, 300, 360
AMP
MCA
115/1/60
HP
RPM
HS Unit
Model
No.
AMP
0.8
1.0
16W*
1550
48, 60, 72,
1.4
1.2
1.4
2.2
1.8
1.5
1.8
2.8
1/20*
25W*
1/20*
1/12*
1000
1550
1000
1000
84, 96, 108,
48, 60, 72, 84,
96, 108, 120,
132, 144, 156,
180, 204, 240
280, 300, 360
HP
RPM
3.7
4.6
1/6
1140
5.4
6.8
1/4
1140
9.3
1/3***
1140
12.0
1/2***
1140
120, 132
144, 156,
180, 204
4.5
5.6
1/3
1140
240, 280, 300
7.4
5.4
6.8
1/2
1100
360
9.6
230/1/60
230/1/60
18, 24,
108A, 118A
136A
36, 125A
48, 60, 72
84, 96, 108
120, 132
144, 156,
180, 204, 240
280, 300, 360
MCA
115/1/60
0.4
0.5
16W
1550
1.4
0.6
1.4
2.2
1.8
0.8
1.8
2.8
1/20†
25W
1/20†
1/12†
1000
1550
1000
1000
4.5
5.6
1/3†
1140
1/2†
1100
6.8
5.4
208-230/460/3/60
48, 60, 72,
84, 96, 108,
3.7
4.6
1/6†
1140
5.4
6.8
1/4†
1140
240, 280, 300
3.7
4.7
1/3***
1140
360
4.8
6.0
1/2***
1140
1/3
1140
120, 132
144, 156,
180, 204
230/460/3/60
144, 156,
180, 204,
2.6-2.6/1.3
3.3-3.3/1.6
1/2**
1140
240, 280,
2.2/1.1
2.8/1.4
300, 360
* Optional variable speed switch is available.
***These motors are 115/230 volts.
**These motors are without thermal overload protection
†230/1/60 unit has 115/1/60 motor supplied with field
installed stepdown transformer.
NOTE 1: All motors are constant speed and operate at top speed as indicated
in motor data. Models 18 through 108, including 108A, 118A, 125A and
136A can be run at reduced speed with addition of optional variable speed
switch. This switch is factory-calibrated for low and high speed ratings, with
intermediate speeds infinitely controllable. Models 120 through 360 operate
at constant speed as indicated in motor data. All 1/4 H.P. motors are P.S.C.
NOTE 3: 1/3 and 1/2 H.P. motors are available as 230V single and 3 phase in
open frame and explosion-proof housings, all available as options. 1/3 and
1/2 H.P. motors operate at single speed only.
NOTE 2: Motors under 1/3 H.P. are totally enclosed, frame mounted,
115/1/60 with thermal overload protection and permanently lubricated
sleeve bearings with optional speed controller available. 1/3 H.P. (115/1/60)
motors are open frame constant speed with thermal over-load protection
and ball bearings. 1/3 H.P. (230V) and 1/2 H.P. (230V) motors are open frame
constant speed with thermal overload protection and ball bearings.
CAUTION: Select appropriate AMP and MCA for the multiple voltage
motors. For example, the AMP and MCA for Models 360 with a 460 volt
Totally Enclosed motor is 1.3 and 1.6 respectively.
NOTE 4: Stated AMP draw is Full Load Amp (FLA). AMP draw varies by motor
manufacturer ± .2 AMPS. Verify FLA per unit motor data plate.
13
Vertical Unit Heaters Features
and General Specifications
Sterling vertical projection unit heaters provide heat where it
is required in commercial and industrial applications Mounted
near the ceiling, this unit provides air circulation and reduces
stratification, without occupying otherwise usable building
space. Units can be provided with an optional diffuser for
patterned discharge, or, without a diffuser for higher velocity
‘spot’ heating near doorways and other high-loss areas.
Sterling vertical units are available in fifteen sizes for
steam or hot water heating. Steam capacities range from
140 to 2,580 E.D.R. (26.0 to 705 MBH) (2 PSI w/60° E.A.T.).
Hot water capacities range from 18.9 to 519.4 MBH
(200° E.W.T./20° drop w/60° E.A.T.).
CONSTRUCTION
The unit casing is formed by two square, 20 gauge. steel
plates. The bottom plate forms an orifice for air delivery. Air
ports are stamped in the top plate of standard units for easy
conversion of low output units.
FAN
Sterling aluminum blade fans are quiet, factory balanced and
sturdy for standard or sparkproof applications.
OPTIONAL OSHA FAN GUARD, LOUVER CONE DIFFUSER
To meet ETL and OSHA requirements, units mounted below
8 ft. (2.4 m) must be equipped with an OSHA Fan Guard. If
adjustments to the vertical airlow pattern are desired, the
Louver Cone Diffuser can be installed.
Note: Vertical Unit Heaters can support either OSHA Fan
Guard or the Louver Cone Diffuser - both units cannot be
installed on the same unit.
HEATING ELEMENT
Hot water-steam coils are rectangular 3 or 4-sided, one-pass,
multiple circuit, with aluminum fins mechanically bonded to
the tubes. Standard coils are seamless copper tubing. Coils
tested at 375 psi under water. Supply and return connections
are steel pipe. Standard coils have .025 copper tubing
suitable for use on steam pressure to 75 psi or hot water up
to 225 psi or 325°F.
MOTORS
Standard motors are 115/60/1, totally enclosed, with
thermal overload protection for all units through size
VS-285. Standard motors for sizes 40, 62 and 77 are shaded
pole, sleeve bearing. The VS-104 motor is permanent split
capacitor type with sleeve bearings. Motor for unit sizes
125 through 285 are permanent split capacitor types with
permanently lubricated ball bearings. Motors used on unit
sizes 317 through 700 are 230/460/60/3, totally enclosed,
with permanently lubricated ball bearings. Unit sizes smaller
than 317 are also available with 230/460/60/3 motors.
14
All motors fractional H.P. and integral H.P., have Class “B”
insulation. The 115/60/1 motors used as standard on unit
sizes 40 through 104 can be operated at multiple speeds
with the addition of a solid-state control.
All units are available with 1140 rpm explosion-proof motors.
THERMOSTATS
Three, line voltage wall thermostats are in stock for
immediate shipment. All models operate in a 45 to 85°F
(7 to 28°C) range. Standard duty model with “off-auto”
and heavy duty models with “auto-off-fan” switching
are available. Other models available on request. Plastic
tamperproof one size fits all thermostat guards are also
available.
STRAP-ON WATER CONTROL
A SPDT strap-on type hot water control with 100° to 240°F
(38 to 116°C) rated at 10 amps at 120V is also available.
Control can be used for direct or reverse acting applications
as a high or low limit.
STEAM PRESSURE CONTROL
SPST switch opens on a rise in pressure. Control is automatically reset, has a range of 0 to 15 PSIG (0 to 103 KPa) and
has an adjustable differential. Other actions, ranges, circuits
and manual reset models are available on request.
MANUAL STARTERS
Single and three-phase models are available. Standard
models are single-speed, toggle-operated, NEMA Type 1
and are surface-mounted.
WALL MOUNTED SPEED CONTROLLERS
Units up to HS108 and VS104 with standard motors (115V)
can be operated at reduced speeds by addition of optional
speed controller. Controller is 5 amps, pre-set at factory for
maximum and minimum speeds, with intermediate speeds
infinitely controllable. All 1/3, 1/2 H.P. and 230V motors
operate only at rated speed and CFM – See performance data
charts.
Vertical Unit Heaters
Steam Performance Data — Table 14
Performance based on 2 # steam pressure at heater with air entering @ 60°F.
STANDARD UNITS
BTU
Per Hour
41,300
33,600
65,500
52,800
80,600
65,100
101,800
87,900
Condensate
LBS. Per
Hour
43
55
68
55
83
67
106
91
VS-125
124,400
VS-144
Sq. Ft.
EDR.
Motor
CFM
70° F
Air Basis
595
436
989
706
1200
858
1490
1180
Outlet
Velocity
Sound
Rating
172
140
273
220
336
271
424
366
Final
Temp.
124
131
121
129
122
130
123
129
129
518
124
1/6
1100
1790
1170
III
152,000
157
633
123
1/6
1100
2220
1045
III
VS-164
173,000
179
720
121
1/6
1100
2620
1230
IV
VS-200
210,200
208
838
118
1/4
1100
3200
1495
III
VS-237
249,800
260
1040
115
1/4
1100
4180
1205
IV
VS-285
283,800
294
1180
119
1/2
1100
4430
1275
IV
VS-317
333,400
345
1390
119
3/4
1140
5210
1500
IV
VS-367
386,000
400
1610
118
3/4
1140
6140
1770
IV
VS-495
496,000
514
2070
117
1-1/2
1160
8020
1640
IV
VS-585
585,000
605
2440
117
1-1/2
1160
9450
1930
IV
VS-700
705,000
729
2940
119
3
1165
11,000
2250
IV
Model
No.
VS-40
VS-62
VS-77
VS-104
H.P.
1/40
1/20
1/20
1/8
RPM
1550
1150
1550
1150
1550
1150
1070
850
877
658
1005
727
1220
894
980
783
I
II
II
II
NOTES:
Constant speed units are rated at capacities shown in regular type; capacities shown in italic faced type apply only to units with multi-speed motors.
To determine BTU per hour capacities at various steam pressures and entering air temperatures, use conversion factors from Table 17, page 17.
Final temperatures at new conditions can be calculated by applying basic formula.
15
Vertical Unit Heaters
Steam Performance Data — Table 15
Performance based on 2 # steam pressure at heater with air entering @ 60°F.
LOW OUTPUT UNITS
STANDARD MODEL “VS” UNITS WITH ALL AIR PORTS OPEN
BTU
Per Hour
Condensate
LBS. Per
Hour
Sq. Ft.
EDR.
Final
Temp.
34,800
26,000
57,200
45,800
68,000
55,000
85,400
71,200
36
27
59
48
71
57
89
74
145
108
238
191
283
229
356
296
108
111
104
109
106
111
108
111
VS-125L
111,000
115
462
107
1/6
1100
2180
1390
III
VS-144L
125,000
130
524
109
1/6
1100
2360
1080
III
VS-164L
149,000
154
620
107
1/6
1100
2920
1340
IV
VS-200L
176,800
183
736
108
1/4
1100
3390
1560
III
VS-237L
214,900
224
895
104
1/4
1100
4500
1270
IV
VS-285L
251,800
260
1050
106
1/2
1100
5040
1420
IV
VS-317L
291,000
302
1210
107
3/4
1140
5700
1610
IV
VS-367L
344,000
356
1430
108
3/4
1140
6600
1870
IV
VS-495L
428,000
446
1785
102
1-1/2
1160
9380
1860
IV
VS-585L
515,000
533
2140
106
1-1/2
1160
10,300
2060
IV
VS-700L
620,000
642
2580
108
3
1165
11,900
2380
IV
Model
No.
VS-40L
VS-62L
VS-77L
VS-104L
Motor
H.P.
1/40
1/20
1/20
1/8
RPM
1550
1150
1550
1150
1550
1150
1070
850
CFM
70° F
Air Basis
668
470
1200
862
1360
995
1640
1290
Outlet
Velocity
950
672
1190
858
1350
992
1050
827
Sound
Rating
I
I
II
II
NOTES:
Constant speed units are rated at capacities shown in regular type; capacities shown in italic faced type apply only to units with multi-speed motors.
To determine BTU per hour capacities at various steam pressures and entering air temperatures, use conversion factors from Table 17, page 17.
Final temperatures at new conditions can be calculated by applying basic formula.
16
Vertical Unit Heaters Steam Calculations
and Correction Factors
EXAMPLE: –
UNIT: ____________ VS-40
Steam Pressure ____ 10 PSI
Entering Air Temp. ____40°F
I.
CAPACITY
A. For 2 lbs. steam, 60° entering air
Read output directly from Tables 14 & 15: 41,300 BTU/HR.
B. For higher steam pressures
and/or E.A.T.'s above or below 60°F
Multiply output from Tables 14 & 15 by appropriate correction
factor from Table 16 (below).
II. FINAL AIR TEMPERATURE
A. For 2 lbs. steam, 60° entering air
41,300 x 1.27 = 52,451 BTU/HR.
Read temperature directly from Tables 14 & 15: 124°F.
B. For capacities calculated in I.B. (above)
III. FINAL AIR VOLUME
A. For 2 lbs. steam, 60° entering air
Output from I.B.
+ E.A.T. = Final Air Temp.
1.085 x CFM from Table 14
460 + Final Air Temp from Table 14 x
530
B. For final air temperatures calculated
In II. B. (above)
IV. CONDENSATE PER HOUR
A. For 2 lbs. steam, 60° entering air
460 + Final Air Temp from II.B.
530
x
52,451 + 40 = 121.0°F
1.085 x 595
Nom. CFM
Final
from
= Air
Table 14
Volume
Nom. CFM
from
Table 14
=
460+124 x 595 = 655 CFM
530
Final
Air
Volume
460+121.0 x 595 = 652 CFM
530
Read lbs. per hour from Tables 14 & 15: 43 LBS./HR.
B. For capacities calculated in I.B. (above)
Output from I.B.
= lbs. per hour of condensate
Latent Heat From Table 17
52,451 = 55.0 LBS./HR.
953
Table 16 — STEAM CORRECTION FACTORS BASED ON 2 LBS. STEAM 60° E.A.T.
STEAM PRESSURE — LBS. PER SQ. IN. (SATURATED)
ENTERING AIR
TEMPERATURE
2
5
10
15
20
30
40
50
75
30°
40°
50°
60°
1.18
1.11
1.03
0.96
0
1.22
1.15
1.07
1.00
1.27
1.20
1.12
1.05
1.34
1.27
1.19
1.12
1.40
1.32
1.25
1.18
1.45
1.37
1.30
1.23
1.53
1.46
1.39
1.32
1.61
1.53
1.46
1.39
1.67
1.59
1.52
1.45
1.79
1.71
1.64
1.57
70°
80°
90°
100°
0.90
0.83
0.76
0.69
0.93
0.86
0.80
0.73
0.98
0.91
0.85
0.78
1.05
0.98
0.91
0.85
1.11
1.04
0.97
0.90
1.16
1.09
1.02
0.96
1.25
1.18
1.11
1.04
1.32
1.25
1.18
1.11
1.38
1.31
1.24
1.17
1.49
1.42
1.36
1.29
Table 17 — PROPERTIES OF SATURATED STEAM
STEAM PRESSURE IN LBS. PER SQUARE INCH GAUGE
0
Steam
Temperature-°F
Latent Heat
of Steam
2
5
10
15
20
30
40
50
75
212.0
218.5
227.1
239.4
249.8
258.8
274.0
286.7
297.7
319.9
970
966
961
953
946
940
929
920
912
891
NOTE 1: Ratings apply only to free inlet and discharge without diffusers.
NOTE 3: For specific motor data refer to motor specifications on page 25.
NOTE 2: All motors are constant speed and operate at top speed as
indicated in motor data. Models 40 through 104 can be run at reduced
speed with addition of optional variable speed switch. This switch is
factory-calibrated for low and high speed ratings, with intermediate
speeds infinitely controllable. Models 164 through 700 operate at
constant speed as indicated in motor data.
NOTE 4: To correct for entering air temperatures, use 1° temperature rise for
each foot in mounting height. As an example, 60° air is required at work area
(5 ft. above floor) units are to be mounted at (20 ft.) above floor. Mounting
height (20 ft.) minus work height (5 ft.) equals differential (15 ft.) or, 15° rise
in air temperature at unit air inlet. Correct for actual inlet air temperature of
75° (60° + 15° = 75° E.A.T.) on Table 16.
17
Vertical Unit Heaters
Hot Water Performance Data** — Table 18
STANDARD OUTPUT UNITS
Model
No.
VS-40
VS-40*
VS-62
VS-62*
VS-77
VS-77*
VS-104
VS-104*
VS-125
VS-144
Water
Temp.
Drop
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
Output
MBH
28.8
22.7
16.7
22.9
18.1
13.4
48.1
39.6
31.1
38.1
31.5
24.8
58.7
48.4
38.1
46.5
38.5
30.5
77.2
68.3
59.3
63.7
56.5
49.2
94.9
83.7
72.5
117.6
105.2
92.8
G.P.M.
5.93
2.34
1.15
4.71
1.87
.92
9.92
4.08
2.14
7.85
3.24
1.71
12.11
4.99
2.62
9.59
3.97
2.09
15.91
7.03
4.08
13.13
5.82
3.38
19.55
8.63
4.98
24.24
10.84
6.38
H2O
Press.
Drop
.37
.06
.02
.24
.04
.01
1.05
.19
.06
.67
.13
.04
.98
.18
.05
.63
.12
.03
2.06
.44
.16
1.43
.31
.11
3.04
.65
.23
4.32
.96
.36
Final
Air
Temp.
104.6°
95.2°
85.9°
108.3°
98.3°
88.4°
104.8°
96.9°
89.0°
109.7°
101.1°
92.4°
105.1°
97.2°
89.3°
110.0°
101.2°
92.7°
106.6°
101.2°
95.8°
108.6°
103.1°
97.6°
108.9°
103.1°
97.3°
108.8°
103.7°
98.5°
Motor
H.P.
R.P.M.
Nominal
CFM
Outlet
Velocity
Sound
Rating
1/40
1550
595
877
I
1/40
1150
436
658
I
1/20
1550
989
1005
II
1/20
1150
706
727
II
1/20
1550
1200
1220
II
1/20
1150
858
894
II
1/8
1070
1528
980
II
1/8
850
1208
783
II
1/6
1100
1790
1170
III
1/6
1100
2220
1045
III
** Performance based on 200° EWT, 20° T.D., 60° E.A.T. Performance at 10° & 30° T.D. is also shown.
For capacities at other conditions, use the correction multipliers in the tables on page 22.
* Speed controller option is required for reduced ratings.
18
Vertical Unit Heaters
Hot Water Performance Data** — Table 19
STANDARD OUTPUT UNITS
Model
No.
VS-164
VS-200
VS-237
VS-285
VS-317
VS-367
VS-495
VS-585
VS-700
Water
Temp.
Drop
10°
20°
30°
10°
20°
30°
15°
20°
30°
15°
20°
30°
15°
20°
30°
15°
20°
30°
15°
20°
30°
15°
20°
30°
15°
20°
30°
Output
MBH
132.4
118.6
104.8
156.2
139.7
123.2
188.9
180.1
162.7
215.4
205.4
185.3
254.9
242.9
218.9
294.7
280.8
253.1
—
368.1
333.6
451.2
431.1
391.0
—
519.4
470.9
G.P.M.
27.29
12.22
7.20
32.20
14.40
8.47
25.95
18.56
11.18
29.60
21.17
12.73
35.03
25.03
15.04
40.49
28.94
17.39
—
37.93
22.92
62.00
44.43
26.86
—
53.52
32.35
H2O
Press.
Drop
3.67
.81
.30
5.02
1.11
.41
3.92
2.10
.82
5.02
2.68
1.04
6.88
3.67
1.42
6.60
3.52
1.36
—
5.81
2.29
8.78
4.72
1.86
—
5.29
2.08
Final
Air
Temp.
106.6°
101.7°
96.9°
105.0°
100.2°
95.5°
101.8°
99.9°
96.0°
104.8°
102.7°
98.5°
105.1°
103.0°
98.7°
104.2°
102.2°
98.0°
—
102.3°
98.3°
104.0°
102.0°
98.1°
—
103.5°
99.5°
Outlet
Velocity
Sound
Rating
2620
1230
IV
1100
3200
1495
III
1/4
1100
4162
1205
IV
1/2
1100
4430
1275
IV
3/4
1140
5210
1500
IV
3/4
1140
6140
1770
IV
1-1/2
1160
8020
1640
IV
1-1/2
1160
9450
1930
IV
3
1165
11,000
2250
IV
Motor
H.P.
R.P.M.
1/6
1100
1/4
Nominal
CFM
** Performance based on 200° EWT, 20° T.D., 60° E.A.T. Performance at 10° & 30° T.D. is also shown.
For capacities at other conditions, use the correction multipliers in the tables on page 22.
19
Vertical Unit Heaters
Hot Water Performance Data** — Table 20
LOW OUTPUT UNITS
STANDARD MODEL “VS” UNITS WITH ALL AIR PORTS OPEN
Model
No.
VS-40L
VS-40L*
VS-62L
VS-62L*
VS-77L
VS-77L*
VS-104L
VS-104L*
VS-125L
VS-144L
Water
Temp.
Drop
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
Output
MBH
23.9
18.9
14.0
16.7
13.5
—
41.5
34.2
27.0
32.4
26.9
21.3
48.9
40.5
32.0
38.5
32.0
25.4
63.7
56.5
49.2
54.5
48.5
42.4
83.7
73.9
64.2
95.4
85.5
75.6
G.P.M.
4.92
1.95
.96
3.45
1.39
—
8.56
3.53
1.85
6.68
2.77
1.46
10.09
4.17
2.20
7.94
3.29
1.75
13.13
5.82
3.38
11.24
4.99
2.91
17.24
7.62
4.41
19.66
8.81
5.20
H2O
Press.
Drop
.26
.04
.01
.13
.02
—
.80
.15
.04
.50
.09
.03
.69
.13
.04
.44
.08
.02
1.43
.31
.11
1.06
.23
.08
2.40
.51
.18
2.92
.65
.24
Final
Air
Temp.
92.9°
86.1°
79.3°
92.8°
86.4°
—
91.9°
86.3°
80.7°
94.7°
88.7°
82.8°
93.2°
87.4°
81.7°
95.7°
89.6°
83.5°
93.5°
89.7°
85.9°
93.5°
89.8°
86.1°
95.4°
91.3°
87.1°
97.3°
93.4°
89.5°
Motor
H.P.
R.P.M.
Nominal
CFM
Outlet
Velocity
Sound
Rating
1/40
1550
668
950
I
1/40
1150
470
672
I
1/20
1550
1200
1190
II
1/20
1150
862
858
II
1/20
1550
1360
1350
II
1/20
1150
995
992
II
1/8
1070
1752
1050
II
1/8
850
1499
827
II
1/6
1100
2180
1390
III
1/6
1100
2360
1080
III
** Performance based on 200° EWT, 20° T.D., 60° E.A.T. Performance at 10° & 30° T.D. is also shown.
For capacities at other conditions, use the correction multipliers in the tables on page 22.
* Speed controller option is required for reduced ratings.
20
Vertical Unit Heaters
Hot Water Performance Data** — Table 21
LOW OUTPUT UNITS
STANDARD MODEL “VS” UNITS WITH ALL AIR PORTS OPEN
Model
No.
VS-164L
VS-200L
VS-237L
VS-285L
VS-317L
VS-367L
VS-495L
VS-585L
VS-700L
Water
Temp.
Drop
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
Output
MBH
112.3
100.7
89.2
135.8
121.8
107.3
168.5
153.8
139.1
188.9
180.1
162.7
220.9
210.6
189.9
260.7
248.5
224.2
—
310.5
281.7
394.4
377.0
342.2
—
453.7
411.7
G.P.M.
23.15
10.38
6.13
27.98
12.52
7.37
34.72
15.85
9.56
25.95
18.56
11.18
30.35
21.70
13.05
35.82
25.61
15.40
—
32.00
19.35
54.19
38.85
23.51
—
46.76
28.28
H2O
Press.
Drop
2.70
.60
.22
3.85
.85
.32
6.75
1.56
.61
3.92
2.10
.82
5.26
2.81
1.09
5.24
2.80
1.09
—
4.23
1.67
6.83
3.68
1.45
—
4.11
1.62
Final
Air
Temp.
95.4°
91.8°
88.1°
96.9°
93.0°
89.2°
94.5°
91.4°
88.4°
94.5°
92.9°
89.7°
95.7°
94.1°
90.7°
96.4°
94.7°
91.3°
—
90.5°
87.7°
95.3°
93.7°
90.6°
—
95.1°
91.9°
Outlet
Velocity
Sound
Rating
2920
1340
IV
1100
3390
1560
III
1/4
1100
4507
1270
IV
1/2
1100
5040
1420
IV
3/4
1140
5700
1610
IV
3/4
1140
6600
1870
IV
1-1/2
1160
9380
1860
IV
1-1/2
1160
10,300
2060
IV
3
1165
11,900
2380
IV
Motor
H.P.
R.P.M.
1/6
1100
1/4
Nominal
CFM
** Performance based on 200° EWT, 20° T.D., 60° E.A.T. Performance at 10° & 30° T.D. is also shown.
For capacities at other conditions, use the correction multipliers in the tables on page 22.
21
Vertical Unit Heaters Hot Water Calculations
and Correction Factors
EXAMPLE: –
UNIT: ___________________________ VS-40
Entering Water Temp. _______________160°F
Entering Air Temp. ___________________40°F
Water Temperature Drop ______________10°F
I.
CAPACITY @ 20° TD:
A. For 200° EWT, 60° EAT
Read output directly from Tables 18 - 21,
22,700 BTU/HR (Ref., Std. VS-40, p. 18).
B. For EWT and/or EAT above
or below Standard
Multiply output from Tables 18 - 21
by factor from Table 22 (below).
22,700 x .878 = 19,931 BTU/HR.
II. CAPACITY AT OTHER TD's
A. For TD's from 5 to 60°F
Multiply output obtained in IA. or IB.
(above) by appropriate factor from Table 23
(below)
IA - 22,700 x 1.15 = 26,105 BTU/HR.
– OR –
IB - 19,931 x 1.15 = 22,921 BTU/HR.
III. GPM AT OTHER TD's
A. For TD's from 5 to 60°F
Multiply GPM of unit for 20° TD, from Table 18
by appropriate factor from Table 23 (below).
2.34 x 2.30 = 5.38 GPM (Applies only to units with
Std. 200° EWT, 60° EAT.) For all others calculate
BTU
using formula – GPM =
500 x TD
IV. PRESSURE LOSS AT OTHER TD's
A.For TD's from 5 to 60°F
Multiply P.D. of unit for 20° TD, from Tables 18 - 21
by appropriate factor from Table 23 (below).
.06 x 5.00 = .30 Ft. H2O
Table 22 — HOT WATER CONVERSION FACTORS BASED ON 200° ENTERING WATER
60° ENTERING AIR 20° TEMPERATURE DROP
ENTERING WATER TEMPERATURE — 20° WATER TEMPERATURE DROP
ENTERING AIR
TEMPERATURE
30°
40°
50°
60°
70°
80°
90°
100°
100°
0.518
0.439
0.361
0.286
0.212
0.140
0.069
0
120°
0.666
0.585
0.506
0.429
0.353
0.279
0.207
0.137
140°
0.814
0.731
0.651
0.571
0.494
0.419
0.345
0.273
160°
0.963
0.878
0.796
0.715
0.636
0.558
0.483
0.409
180°
1.120
1.025
0.941
0.857
0.777
0.698
0.621
0.546
200°
1.268
1.172
1.085
1.000
0.918
0.837
0.759
0.682
220°
1.408
1.317
1.231
1.143
1.060
0.977
0.897
0.818
240°
1.555
1.464
1.375
1.286
1.201
1.117
1.035
0.955
280°
1.850
1.755
1.663
1.571
1.483
1.397
1.311
1.230
260°
1.702
1.609
1.518
1.429
1.342
1.257
1.173
1.094
300°
1.997
1.908
1.824
1.717
1.630
1.545
1.462
1.371
To obtain the BTU capacity for conditions other than those in the basic capacity tables, multiply the basic rating
(200° entering water, 60° entering air,) by the proper constant from the above tables.
Table 23 — HOT WATER BTU, GPM AND PRESSURE LOSS FACTORS BASED ON STANDARD
CONDITIONS OF 200°F ENTERING WATER 60°F ENTERING AIR & 20°F WATER DROP
TEMPERATURE DROP °F
USE FACTORS FROM THIS TABLE TO OBTAIN
APPROXIMATE RESULTS
5
To obtain BTU for other Water Temperature Drops,
multiply basic BTU rating by applicable Factor.
To obtain GPM for other Water Temperature Drops,
multiply basic GPM rating by applicable Factor.*
To obtain Pressure Loss Feet of Water for other
temperature Drops, multiply Basic loss at 20° drop by
Factor.
10
15
20
25
30
40
50
60
1.25
1.15
1.08
1.00
.94
.90
.83
.76
.72
5.00
2.30
1.44
1.00
.74
.59
.40
.30
.24
10.00
5.00
2.00
1.00
.60
.40
.20
.13
.07
*Table 24 — MINIMUM WATER FLOW — GPM
MODEL No.
MIN. GPM
40
.55
62
.55
77
.55
104
.55
144
.82
164
.82
200
1.10
237
1.10
317
1.10
367
1.10
*Table 25 — HEATING CAPACITY FACTORS FOR VARIOUS RATES OF WATER FLOW
% of Rated Water Flow
Btu/Hr Heating Capacity
22
25%
.80
50%
.89
75%
.96
100%
1.00
125%
1.04
150%
1.07
175%
1.10
Vertical Unit Heaters Dimensional Data
Figure 6
Figure 7
K
H
H
K
H
H
K
V
V
G
A
A
U
R
R
G
V
R
R
G
A
R
A
(4) MOUNTING HOLES
THREAD TAPS
3/8 -
(4) MOUNTING HOLES 3/8 - 16 FOR MODELS 104-367
THREAD TAPS 1/2 - 13 FOR MODELS 495-700
16 FOR MODELS 40-77
CEILING
CEILING
P
L
F
T
STEAM
SUPPLY
OR
HOT WATER
RETURN
P
L
F
B
STEAM
RETURN
OR
HOT WATER
SUPPLY
K
T
STEAM
SUPPLY
OR
HOT WATER
RETURN
B
S
S
C
T
C
E
STEAM
RETURN
OR
HOT WATER
SUPPLY
T
E
P
P
D
D
Table 25 - FIGURE 6 — MODEL “VS” UNIT HEATER ROUGHING IN DIMENSIONS
Unit
Size
40
62
77
Fan
Dia.
111/4
131/2
131/2
A
181/4
211/4
211/4
B
45/8
45/8
61/8
C
11/4
15/8
15/8
D
113/4
141/2
145/8
E
13/4
13/4
11/4
F
4
4
3
G
11
14
14
H
13/8
13/8
13/8
K
17/8
17/8
17/8
L
P
(Min.) (NPT)
7
11/2
7
11/2
7
11/2
R
35/8
35/8
35/8
S
65/8
71/8
85/8
T
23/4
23/4
23/4
U
11
14
14
V
35/8
35/8
35/8
Approx. Ship
Wt. (lbs.)
32
40
43
S
91/8
93/4
95/8
101/8
121/2
115/8
113/4
123/4
141/8
141/4
173/4
201/4
T
23/4
23/4
23/4
23/4
23/4
23/4
23/4
23/4
23/4
31/2
31/2
31/2
U
171/2
171/2
201/2
201/2
201/2
181/2
181/2
181/2
181/2
301/2
301/2
301/2
V
41/8
41/8
41/2
41/2
41/2
93/4
93/4
93/4
93/4
61/2
61/2
61/2
Approx. Ship
Wt. (lbs.)
63
64
80
80
86
134
139
139
145
294
307
366
Table 26 - FIGURE 7 — MODEL “VS” UNIT HEATER ROUGHING IN DIMENSIONS
Unit
Size
104
125
144
164
200
237
285
317
367
495
585
700
Fan
Dia.
163/4
163/4
193/4
193/4
193/4
251/4
251/4
251/4
251/4
301/2
301/2
301/2
A
251/4
251/4
291/2
291/2
291/2
371/2
371/2
371/2
371/2
421/2
421/2
421/2
B
61/8
61/8
61/8
61/8
75/8
75/8
75/8
75/8
91/8
91/8
121/8
135/8
C
21/2
21/2
23/8
23/8
23/8
31/2
31/2
31/2
31/2
31/2
31/2
31/2
D
171/2
171/2
205/8
205/8
205/8
263/8
263/8
263/8
263/8
311/4
311/4
311/4
E
11/8
13/4
11/4
13/4
21/2
11/2
11/4
21/8
21/2
15/8
21/8
31/2
F
31/2
31/2
41/2
41/2
41/2
31/2
31/2
41/2
31/2
31/2
31/2
41/2
G
171/2
171/2
201/2
201/2
201/2
281/2
281/2
281/2
281/2
301/2
301/2
301/2
Table 27 - FIGURE 8
H
13/8
13/8
13/4
13/4
13/4
13/4
13/4
13/4
13/4
21/4
21/4
21/4
K
23/4
23/4
31/2
31/2
31/2
31/2
31/2
31/2
31/2
41/4
41/4
41/4
L
P
(Min.) (NPT)
7
11/2
7
11/2
7
21/2
7
2/2
7
2/2
7
21/2
7
21/2
7
21/2
7
21/2
7
21/2
7
21/2
7
21/2
Figure 8
LOUVER CONE DIFFUSER ROUGHING IN DIMENSIONS
Unit
Size
40
62 & 77
104 & 125
144, 164 & 200
237, 285, 317 & 367
495, 585, 700
R
41/8
41/8
41/2
41/2
41/2
43/4
43/4
43/4
43/4
61/2
61/2
61/2
A
161/2
201/4
241/4
283/8
351/2
411/2
B
141/4
171/8
211/8
243/4
311/2
371/4
C
61/2
81/2
93/4
111/2
133/4
171/2
D
25/8
31/8
315/16
45/8
45/8
43/4
No. of
Louvers
8
8
8
8
12
12
A
C
D
B
23
Vertical Unit Heaters Mounting Heights & Throws,
Technical Data — Table 28
MAXIMUM MOUNTING HEIGHT IN FEET FOR MODEL “VS” UNIT HEATERS
WITH AND WITHOUT LOUVER CONE DIFFUSER
Unit
Size
VS-40
VS-40*
VS-40L
VS-40L*
VS-62
VS-62*
VS-62L
VS-62L*
VS-77
VS-77*
VS-77L
VS-77L*
VS-104
VS-104*
VS-104L
VS-104L*
VS-125
VS-125L
VS-144
2
10.5
12.5
8.0
9.0
12.5
14.5
9.0
10.5
12.0
14.5
9.5
11.5
15.0
19.0
11.5
14.0
15.0
18.5
11.0
13.5
18.0
22.0
13.0
17.0
14.0
17.0
11.0
13.5
17.5
21.5
15.0
18.5
16.0
19.5
21.0
26.0
15.5
19.0
Steam Pressure (PSI)
50
5
10
9.0
10.0 10.0
12.0 12.0 11.0
8.0
8.0
8.0
8.5
8.0
8.5
12.0 12.0 10.5
14.0 13.5 12.0
8.5
8.0
8.5
9.0
10.0 10.0
11.5 11.5 10.0
14.0 14.0 12.0
9.0
8.0
9.0
9.5
11.0 11.0
14.5 14.5 12.5
18.5 18.5 16.5
9.5
11.0 11.0
13.5 13.5 12.0
14.5 14.0 12.0
18.0 17.5 15.5
9.0
10.5 10.5
13.0 13.0 11.5
17.5 17.5 15.0
21.0 21.0 19.0
12.5 12.0 11.0
16.5 16.0 14.0
13.5 13.0 11.5
16.5 16.0 14.0
9.5
10.5 10.5
13.0 13.0 12.0
17.0 16.5 15.0
21.0 20.5 18.5
14.5 14.5 13.0
18.0 18.0 16.0
15.5 15.5 14.0
19.0 18.5 17.0
20.5 20.0 17.5
25.5 25.0 22.5
15.0 14.5 13.0
18.5 18.0 16.0
75
8.0
10.0
8.0
8.0
9.5
11.5
8.0
8.5
9.5
11.5
8.0
9.0
12.0
16.0
8.0
11.5
11.5
13.5
8.5
11.0
14.0
18.0
10.5
13.5
11.0
13.5
9.0
11.5
14.5
17.5
12.5
15.0
13.5
16.0
17.0
21.5
12.0
15.5
Unit
Size
VS-144L
VS-164
VS-164L
VS-200
VS-200L
VS-237
VS-237L
VS-285
VS-285L
VS-317
VS-317L
VS-367
VS-367L
VS-495
VS-495L
VS-585
VS-585L
VS-700
VS-700L
2
18.0
22.5
18.0
22.5
22.0
27.5
22.0
27.5
25.5
31.5
20.0
25.0
24.0
29.5
21.0
26.0
25.5
32.0
24.0
30.0
29.0
36.0
28.5
35.5
32.5
41.0
29.5
36.5
35.0
43.5
34.0
42.5
37.0
46.5
38.5
48.0
42.5
53.0
NOTES:
* * = Low Speed
L = Model “VS” low output model
with all air ports open
Steam Pressure (PSI)
50
75
5
10
17.5 17.5 15.0 14.0
22.0 21.5 18.5 18.0
17.5 17.0 14.5 14.0
22.0 21.5 19.0 18.0
21.5 21.0 18.5 17.5
27.0 26.5 23.5 22.5
21.5 21.0 18.5 17.5
27.0 26.5 24.0 23.0
25.0 24.5 22.0 21.0
31.0 30.5 27.0 26.0
19.5 19.0 17.0 16.0
24.0 23.5 20.5 19.5
23.5 23.0 20.0 19.0
28.5 28.0 24.5 23.5
20.5 20.0 17.5 17.0
25.5 25.0 22.0 21.0
25.0 24.5 21.0 20.0
31.0 30.0 26.0 25.0
23.0 22.0 20.0 19.0
29.0 28.0 25.0 24.0
28.5 28.0 25.0 24.0
35.0 34.0 30.0 29.0
28.0 27.5 24.0 23.0
35.0 34.0 30.0 29.0
31.5 30.5 27.5 26.5
40.0 39.0 35.0 33.5
29.0 28.5 25.0 24.0
36.0 35.5 32.0 30.5
34.0 33.0 29.0 28.0
42.5 41.5 35.0 34.0
33.0 32.0 28.0 27.0
41.5 40.5 36.0 34.5
36.0 35.0 31.0 30.0
45.5 44.5 39.0 37.0
37.5 36.5 32.0 30.5
47.0 46.0 40.0 39.0
41.5 40.5 35.0 33.5
52.0 51.0 44.0 42.0
Figures in bold face show maximum
mounting height with louver cone
diffusers set vertically.
To meet ETL and OSHA
requirements, units mounted below 8
feet from floor must be equipped with
an OSHA fan guard. Please see page
28 for ordering information.
Above table based on 60°F entering air
temperature. In providing for the use
of diffusers, it must be remembered
that adjustment of a LCD to deflect air
toward horizontal immediately lowers
the mounting height limit.
MAXIMUM SPREAD IN FEET
Unit Size: VS-
40
62
77
104
125
144
164
200
237
285
317
367
495
585
700
Spread (Ft.)
15
17
20
24
26
27
28
32
35
37
45
50
54
57
60
NOTE: The “spread” is the diameter of the comfort zone at floor level. Projected by the Model “VS” unit without the louver cone diffuser. Based on two
pounds steam pressure and 60°F entering air.
TECHNICAL DATA
Propylene Glycol, when sizing equipment for systems that will utilize a Propylene Glycol solution consider the factors shown on
page 8.
24
Vertical Unit Heaters Motor Characteristics
Table 29 - TOTALLY ENCLOSED
MOTOR TYPE
VS Unit
Model
No.
AMP
Table 30 - EXPLOSION PROOF WITH THERMAL OVERLOAD
MOTOR TYPE
MCA
HP
RPM
VS Unit
Model
No.
AMP
115/1/60
MCA
HP
RPM
115/1/60
40
1.23**
1.6
1/40*
1550
62, 77
2.1**
2.6
1/20*
1550
104
1.2**
1.5
1/8*
1070
125, 144, 164
2.3**
2.9
1/6
1100
200, 237
3.6**
4.5
1/4
1100
285
5.4**
6.8
1/2
1100
208-230/460/3/60
40, 62, 77,
104, 125
3.8
4.8
1/6
1140
200, 237
4.4
5.5
1/4
1140
285
7.8
9.8
1/2
1140
144, 164
40, 62, 77,
104, 125,
0.98-1.1/0.55
1.2-1.4/0.7
1/6
1140
200, 237
1.2-1.4/0.7
1.5-1.8/0.9
1/4
1140
144, 164
208-230/460/3/60
285
1.8-2.0/1.0
2.3-2.5/1.3
1/2
1140
317, 367
3.1-3.2/1.6
3.9-4.0/2.0
3/4
1140
495, 585
5.0-4.4/2.2
6.3-5.5/2.8
1-1/2
1160
700
9.6-8.2/4.1
12.0-10.3/5.1
3
1165
40, 62, 77,
104, 125
1.0-1.0/0.5
1.3-1.3/0.6
1/6
1140
200, 237
1.1-1.1/0.55
1.4-1.4/0.7
1/4
1140
285
1.9/0.95***
2.4/1.2
1/2
1140
317, 367
3.1-3.2/1.6
3.9-4.0/2.0
3/4
1145
495, 585
5.0/2.5***
6.5/3.3
1-1/2
1150
700
10.0/5.0***
12.5/6.3
3
1150
144, 164
575/3/60
40, 62, 77,
104, 125,
0.6
0.8
1/3
1140
285
0.8
1.0
1/2
1140
144, 164,
200, 237
317, 367
1.3
1.6
3/4
1140
495, 585
2.0
2.5
1-1/2
1160
700
3.8
4.7
3
1165
* Optional variable speed switch is available.
*** These motors are 230/460 volts only.
** These motors have automatic thermal overload protection or
impedance protection.
NOTE 1: All motors are constant speed and operate at top speed as
indicated in motor data. Models through 1/8 H.P. can be run at reduced
speed with addition of optional variable speed switch. This switch is
factory-calibrated for low and high speed ratings, with intermediate speeds
infinitely controllable. Models 164 through 700 operate at constant speed
as indicated in motor data.
CAUTION: Select appropriate AMP and MCA for the multiple voltage
motors. For example, the AMP and MCA for Model 40 with a 230 volt
Totally Enclosed motor is 1.1 and 1.4 respectively.
NOTE 2: Stated draw is Full Load (FLA). AMP draw varies by motor
manufacturer ± .2 AMPS.
25
Horizontal and Vertical Unit Heater
Piping and Installation
The illustrations below depict different typical piping
configurations. Proper selection should be based on the
operational characteristics of the source supply. For
selection and sizing of piping, traps, filters and other piping
specialities, ASHRAE guides and specialty manufacturer's
literature should be consulted. We assume that the type and
total design of systems has been selected or approved by a
qualified engineer. The installation and service manual
should be consulted for further information on installation,
operation, drainage and system cleaning.
Piping and installation is typical for both horizontal and
vertical unit heaters – except side connections Figure 13.
Figure 9
Figure 10
Figure 11
Figure 12
26
Figure 13
Wiring Diagrams — Figure 14
1 PHASE LINE
1 PHASE LINE
1 PHASE LINE
MANUAL STARTING
SWITCH
1 PHASE LINE
MAGNETIC
STARTING SWITCH
MANUAL STARTING
SWITCH
THERMOSTAT
MOTOR
MOTOR
MOTOR
MANUAL STARTING
SWITCH
THERMOSTAT
MOTOR
SPEED CONTROLLER
MOTOR
ROOM THERMOSTAT
MANUAL CONTROL WITH
SINGLE PHASE MOTOR
1 PHASE LINE
THERMOSTATIC CONTROL
WITH MANUAL STARTER
3 PHASE LINE
MAGNETIC
STARTING SWITCH
THERMOSTAT
THERMOSTATIC CONTROL
USING MAGNETIC STARTER
OPERATING SEVERAL UNITS
3 PHASE LINE
MAGNETIC
STARTING SWITCH
MANUAL STARTING
SWITCH
THERMOSTAT
MOTORS
MOTORS
MOTOR
SPEED
CONTROLLERS
SPEED CONTROLLERS WITH
MAGNETIC STARTING SWITCH
FOR OPERATING SEVERAL UNITS
MANUAL CONTROL WITH
THREE PHASE MOTOR
THERMOSTATIC CONTROL
OF SEVERAL THREE
PHASE UNITS
SPEED CONTROLLER WITH
MANUAL STARTING SWITCH
1. For internal wiring and
overload protection on all
starters, consult the control
manufacturer for details.
2. When using thermostatic
control with a manual starter, be
sure that the electrical rating of
the thermostat is sufficient to
carry the motor current.
3. Refer to pages 13 and 25 for
motor characteristics of
individual unit heaters.
REFER TO PAG
Warranty
STEAM/HOT WATER UNIT HEATER WARRANTY
The products in this catalog are warranted by Sterling to be
free from defects in material and workmanship for a period
of one (1) year from the date of shipment from Sterling's
plant. Sterling's liability under this warranty is limited to
replacing or repairing at our option, F.O.B. our plant any
defective component or assembly returned to our factory
prepaid and with proper return authorization documents.
All repairs or replacements are made subject to factory
inspection. No liability is accepted for consequential
damages, freight or labor charges.
TERMS OF SALE
• No obligation is assumed by this corporation to sell to
anyone holding this book any of the items listed herein.
• An order is not a valid order until acknowledged by Sterling.
• Sterling reserves the right to make changes in design,
material or accessory vendors without notice and without
obligation to incorporate such changes in products of prior
manufacture.
• Additional sales and freight terms are contained in the
price list.
This warranty does not cover damages or failure due to
improper installation or piping, corrosive atmospheric
conditions, misuse or negligence by others.
27
Horizontal
Vertical
Hydronic Unit Heaters
Hydronic Unit Heaters
Model Number Description Model Number Description
Digit
H
X
X
Item
X — 1
Prefix
2
UT
3
CT
4
5
6
CA
7
8
SV
MT
†
9
AS
Digit
V
X
Item
(Internal use Only)
1, 2 - Unit Type [UT]
HS - Horizontal
VS - Vertical
3 - Coil Type [CT]
3 - Coil Type [CT]
A - Serpentine
B - Standard (Header Type)
B - Standard
4, 5, 6 - Capacity [CA]
040 - 40,000 BTU/HR
062 - 62,000 BTU/HR
077 - 77,000 BTU/HR
104 - 104,000 BTU/HR
125 - 125,000 BTU/HR
144 - 144,000 BTU/HR
164 - 164,000 BTU/HR
200 - 200,000 BTU/HR
*Based on 2 psi steam
Coil Type [B] Standard**
096 - 96,000 BTU/HR
108 - 108,000 BTU/HR
120 - 120,000 BTU/HR
132 - 132,000 BTU/HR
144 - 144,000 BTU/HR
156 - 156,000 BTU/HR
180 - 180,000 BTU/HR
204 - 204,000 BTU/HR
240 - 240,000 BTU/HR
280 - 280,000 BTU/HR
300 - 300,000 BTU/HR
360 - 360,000 BTU/HR
3
CT
4
5
6
CA
7
8
SV
MT
†
9
AC
237 - 237,000 BTU/HR
285 - 285,000 BTU/HR
317 - 317,000 BTU/HR
367 - 367,000 BTU/HR
495 - 495,000 BTU/HR
585 - 585,000 BTU/HR
700 - 700,000 BTU/HR
7 - Supply Voltage [SV]
1 - 115/1/60
4 - 208/3/60
5 - 230/3/60
6 - 460/3/60
7 - 575/3/60
Z - Other
8 - Motor Type [MT]
1 - Standard
2 - Explosion Proof
7 - Supply Voltage [SV]
5 - 230/3/60
6 - 460/3/60
Z - Other
9 - Accessories [AS]
All Field Installed Accessories are to be entered as a separate line item using the catalog
number which utilizes “AS” as a prefix. i.e: G6 becomes AS-G6.
8 - Motor Type [MT]
1 - Standard Motor
2 - Explosion Proof
FACTORY INSTALLED
M6 - OSHA Fan Guard
9 - Accessories [AS]
All Field Installed Accessories are to be entered as a separate line item using the catalog
number which utilizes “AS” as a prefix. i.e: G6 becomes AS-G6.
FACTORY INSTALLED
M6 - OSHA Fan Guard***
(1 Phase Motors Only)
M9 - Standard Fan Guard
(3 Phase or Explosion Proof Motors Only)
*** OSHA Fan Guard Standard on HS-108A
through HS-136A and HS-18 through HS-48
(with 1 Phase Standard Motors Only)
V1 - Phenolic Coating (Air Dried)
V2 - Phenolic Coating (Baked))
V5 - Phenolic Coating (Air Dried)
Optional Vertical Louvers
V6 - Phenolic Coating (Baked)
Optional Vertical Louvers
2
UT
4, 5, 6 - Capacity [CA]*
Coil Type [A] Serpentine*
108 - 8,030 BTU/HR
125 - 24,800 BTU/HR
118 - 18,400 BTU/HR
136 - 35,900 BTU/HR
*Based on 200° EWT, 60° EAT, 20° T.D.
1 - 115/1/60
3 - 230/1/60
4 - 208/3/60
X — 1
(Internal use Only)
1, 2 - Unit Type [UT]
018 - 18,000 BTU/HR
024 - 24,000 BTU/HR
036 - 36,000 BTU/HR
048 - 48,000 BTU/HR
060 - 60,000 BTU/HR
072 - 72,000 BTU/HR
084 - 84,000 BTU/HR
**Based on 2 psi steam
X
Prefix
FIELD INSTALLED (AS-_____ )
G0 - Locking Thermostat Cover
For Accessory U2
G6 - Locking Thermostat Cover
For Accessories U1 & U3
L2-1 - 115/230V Single Phase
Disconnect Switch - Non Fused
L2-2 - 208/230V 3 Phase
Disconnect Switch - Non Fused
L2-3 - 460/575V 3 Phase
Disconnect Switch - Non Fused
Q6H - Vertical Louvers
U1 - Line Voltage Stat “Off/Auto Switch“
U2 - Line Voltage Stat “Auto/Off/Fan Switch, SPST”
U3 - Line Voltage Stat
“Auto/Off/Fan Switch, SPDT”
U4 - Celsius Line Voltage Thermostat
U5 - Strap on Hot Water Control
U6 - Steam Pressure Control
(Open on rise in pressure)
U7 - Steam Pressure Control
(Close on rise in pressure)
U8 - 5.0 Amp Speed Control Switch
(Capacities [CA] 108A-136A and 18-108 Only)
U9 - Manual Starters - 1 Phase
Q7 U0 - Manual Starters - 3 Phase
260 NORTH ELM ST. WESTFIELD, MA 01085
(413) 564-5540 • FAX: (413) 562-5311
www.sterlinghvac.com
V1 - Phenolic Coating (Air Dried)
V2 - Phenolic Coating (Baked)
V7 - Phenolic Coating - Louver Cone Diffuser**
**Will match phenolic type selected for unit
(Air Dried or Baked).
FIELD INSTALLED (AS-____ )
G0 - Locking Thermostat Cover
For Accessory W2
G6 - Locking Thermostat Cover
For Accessory W1
L2-1 - 115/230V Single Phase
Disconnect Switch - Non Fused
L2-2 - 208/230V 3 Phase
Disconnect Switch - Non Fused
L2-3 - 460/575V 3 Phase
Disconnect Switch - Non Fused
Q8 - Louver Cone Diffuser
U4 - Celsius Line Voltage Thermostat
U5 - Strap on Hot Water Control
U6 - Steam Pressure Control
(Open on rise in pressure)
U7 - Steam Pressure Control
(Close on rise in pressure)
U8 - 5.0 Amp Speed Control Switch
(Capacities [CA] 040-104 Only)
U9 - Manual Starters - 1 Phase
U0 - Manual Starters - 3 PhaseQ7 W1 - T6169C Line Voltage Thermostat w/Subbase
(Light Duty)
W2 - T4051A Line Voltage Thermostat
(Heavy Duty)
W4 - Q651A1009 Stat Subbase Only
(Used with T4051A1003 for “Off/Auto Switch”)