Mestek | VERTICAL STEAM HOT WATER HEATERS | User manual | Horizontal and Vertical Steam/Hot Water Unit
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HCV-15
HYDRONIC
HEATING
EQUIPMENT
Application Manual
HORIZONTAL AND VERTICAL
STEAM/HOT WATER
UNIT HEATERS
Contents
APPLICATION OF UNIT HEATERS
HORIZONTAL UNIT HEATERS
Steam Performance Data
Steam Calculation and Correction Factors
Hot Water Performance Data
Hot Water Calculation and Correction Factors
Mounting Heights and Throws
SERPENTINE COIL DIMENSIONAL DATA
PIPING AND INSTALLATION
HORIZONTAL AND VERTICAL MODELS
MOTOR CHARACTERISTICS - HORIZONTAL MODELS
PAGE
2
12
12
13
VERTICAL UNIT HEATERS
Mounting Heights and Throws
14
Steam Performance Data
Steam Calculations and Correction Factors
Hot Water Calculations and Correction Factors
15-16
17
Hot Water Performance Data – Standard Output 18-19
Hot Water Performance Data – Low Output 20-21
22
23
24
25
8
9
6
7
3
4
5
10
11
26
Sterlings's horizontal steam/hot water unit heaters are available in a range of outputs and airfl ows allowing almost unlimited fl exibility in job design.
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 airfl ow to areas of greatest heat loss.
• Adjust throw length with horizontal louvers.
• Use horizontal and vertical louvers for complete directional control of airfl ow.
• Mount units at the lowest practical and allowable level.
• Select lower CFM models for lower mounting heights and heavily occupied areas.
• The higher a unit must be located, the more CFM is required to get the heat down to the occupied zone.
• More, smaller units will provide better heat distribution than fewer larger ones.
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
WARRANTIES AND TERMS OF SALE
MODEL NUMBER DESCRIPTION
27
27
28
Application of Unit Heaters
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.
The fi rst step in the design of a job is typically to determine the heat loss before considering CFM, fi nal 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.
FIG. A. Typical arrangement of unit heaters in manufacturing plant, showing air fl ow patterns. Not to scale.
A narrow area with two exposed walls either with or without roof exposure.
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 confi guration, 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.
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 fi eld 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 fi ts all thermostat guards are also available.
Figure 1
Figure 2
MANUAL STARTERS
Single and three-phase models are available. Standard models are single-speed, toggle-operated, NEMA Type 1 and are surface-mounted.
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.
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 infi nitely 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**
—
146.0
—
160.0
—
190.0
—
208.0
76.0
97.0
88.0
110.0
98.0
122.0
—
134.0
—
244.0
—
280.0
—
310.0
—
366.0
—
Cond.
lbs./hr.
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
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
75,600
96,000
86,400
108,000
97,200
120,000
—
132,000
—
144,000
—
156,000
—
180,000
—
204,000
Output
BTU/
HR*
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
—
240,000
—
280,000
—
300,000
—
360,000
—
Sq. Ft.
E.D.R.
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
—
Final
Air
°F
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
—
1140
—
1140
—
1140
—
1140
900
1000
900
1000
900
1140
—
1140
—
1140
—
1100
—
1100
—
1100
—
1350
1000
900
1000
900
1000
900
1000
RPM
1550
1350
1550
1350
1550
* 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.
—
1000
—
1150
—
800
—
1000
750
930
800
1000
900
900
—
950
—
900
—
980
—
700
—
1000
—
480
550
460
650
510
800
700
900
Outlet
FPM
395
330
450
380
550
—
2200
—
2600
—
2200
—
2900
1100
1400
1100
1800
1500
1900
—
2000
—
3500
—
4200
—
5000
—
5500
—
Nominal
CFM
395
330
450
380
550
480
750
630
900
700
1100
950
1400
4
—
4.5
—
4.5
—
4.5
—
4.5
2.2
4.5
—
4.5
2.2
2.2
2.2
2.2
—
5.4
—
5.4
—
4.5
—
5.4
—
1.4
1.4
1.4
2.2
1.2
1.4
1.4
1.4
Nom.
Amps
@
115
VAC†
.80
.80
.80
.80
1.2
—
18
—
18
—
18
—
18
16
18
—
18
14
16
16
16
—
24
—
24
—
20
—
20
—
12
14
14
14
10
12
12
12
Nom.
Fan
Diam.
(Inches)
9
9
10
10
10
Horizontal Unit Heaters Steam Calculations and Correction Factors
EXAMPLE: –
Steam Pressure ____ 10 PSI
Entering Air Temp. ____40°F
I. CAPACITY
A. 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 Multiply output from Table 1 by appropriate correction and/or E.A.T.'s above or below 60°F factor
II. FINAL AIR TEMPERATURE
A. 2 lbs. steam, 60° entering air Read temperature directly from Table 1, 109°F.
(Ref., Std. HS-24).
B. For capacities calculated in I.B. (above) Output from I.B.
+ E.A.T. = Final Air Temp.
1.085
x CFM from Table 1
III. FINAL AIR VOLUME Nom. CFM Final
A. For 2 lbs. steam, 60° entering air 460 + Final Air Temp from Table 1 x from = Air
530 Table 1 Volume
24,000 x 1.29 = 30,960 BTU/HR.
30,960
+ 40 =103.4°F.
1.085 x 450
460+109 x 450 =483 CFM
530
B. fi nal air temperatures calculated
In II. B. (above)
IV. CONDENSATE PER HOUR
A. 2 lbs. steam, 60° entering air
Nom. CFM Final
460 + Final Air Temp from II.B. x from = Air
530 Table 1 Volume
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
Table 2 — STEAM CORRECTION FACTORS BASED ON 2 LBS. STEAM 60° E.A.T.
ENTERING AIR STEAM PRESSURE — LBS. PER SQ. IN. (SATURATED)
TEMPERATURE 0 2 5 10 15 20 30 40 50 75
30°
40°
50°
60°
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
70°
80°
90°
100°
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
Table 3 — PROPERTIES OF SATURATED STEAM
STEAM PRESSURE IN LBS. PER SQUARE INCH GAUGE
0 2 5 10 15 20 30 40 50
Steam
Temperature-°F
Latent Heat of Steam
212.0
970
218.5
966
227.1
961
239.4
953
249.8
946
258.8
940
274.0
929
286.7
920
297.7
912
75
891
460 +103.4
x
530
450
= 478 CFM
30,960
= 32.5 LBS./HR.
953
100
2.02
1.93
1.84
1.75
1.66
1.58
1.50
1.42
100
881
125
2.11
2.02
1.93
1.84
1.76
1.68
1.59
1.51
125
150
2.20
2.11
2.02
1.93
1.84
1.76
1.67
1.59
319.9
337.9
352.9
365.9
868
150
857
5
Horizontal Unit Heaters
Hot Water Performance Data — Table 4
Performance based on 200° EWT, 60° E.A.T., 20° TD.
106
106
113
100
103
102
—
104
103
103
111
105
112
104
106
100
106
99
100
95
99
96
98
103
Final
Air
°F
91
90
94
96
102
—
106
—
106
—
102
—
103
—
—
104
—
100
—
110
—
107
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
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
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
—
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
Pressure
Drop
.80
2.2
2.2
3.0
.005
.014
.09
.12
.17
.23
.24
.29
.36
.39
.41
.43
.53
.60
.79
1.06
1.33
2.1
2.1
Motor
HP
16 W
16 W
25 W
1/20
16 W
16 W
25 W
1/3
1/3
1/3
1/3
1/3
1/3
1/3
1/2
1/2
1/2 att att att att att att
1/20
1/20
1/20
1/12
1/12
1/12
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.
1000
900
900
—
950
—
1000
—
1150
—
650
510
800
700
900
750
930
800
395
350
450
380
550
480
550
460
Outlet
FPM
250
215
500
420
590
450
550
480
800
—
1000
—
900
—
980
—
700
—
1000
—
1800
1500
1900
—
2000
—
2200
—
2600
—
900
700
1100
950
1400
1100
1400
1100
Nominal
CFM
245
210
500
420
580
460
850
750
395
350
450
380
550
480
750
630
2200
—
2900
—
3500
—
4200
—
5000
—
5500
—
1000
900
1140
—
1140
—
1140
—
1140
—
1000
900
1000
900
1000
900
1000
900
1550
1350
1550
1350
1550
1350
1000
900
RPM
1550
1350
1550
1350
1550
1350
1000
900
1140
—
1140
—
1140
—
1100
—
1100
—
1100
—
—
4.5
—
4.5
—
2.2
2.2
4.5
—
4.5
1.4
1.4
1.4
1.4
2.2
2.2
2.2
2.2
Nom.
Amps
@
115
VAC†
.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
4.5
—
4.5
—
4.5
—
5.4
—
5.4
—
5.4
—
II
III
II
III
II
III
—
IV
II
I
II
I
III
I
II
I
II
I
II
I
II
I
II
I
Sound
Rating
II
I
II
I
II
—
IV
—
IV
—
IV
—
III
—
IV
—
IV
—
IV
—
IV
—
6
Horizontal Unit Heaters Hot Water Calculations and Correction Factors
I. CAPACITY @ 20° TD:
A.
200
° EWT, 60° EAT
B. For EWT and/or EAT above or below Standard
Read output directly from Table 4,
17,400
BTU/HR (Ref., Std. HS-24).
Multiply output from Table 4 by factor from Table 5 (below).
EXAMPLE: –
Entering Air Temp. ___________________40°F
Water Temperature Drop ______________10°F
17,400
x .878 = 15,277 BTU/HR.
II. CAPACITY AT OTHER TD's
A. For TD's from 5 to 60°F
III. GPM AT OTHER TD's
A. TD's
Multiply output obtained in IA. or IB.
(above) by appropriate factor from Table 6
(below)
Multiply GPM of unit for 20° TD, from Table 4 by appropriate factor from Table 6 (below).
IV. CAPACITY AT OTHER RATES Multiply output from Table 4 by factor
8 (below).
V. PRESSURE LOSS AT OTHER TD's
A. TD's
Multiply P.D. of unit for 20° TD, from Table 4 by appropriate factor from Table 6 (below). .014
x 5.00 = .07 Ft. H
2
O
Table 5 — HOT WATER CONVERSION FACTORS BASED ON 200° ENTERING WATER
60
° ENTERING AIR 20° TEMPERATURE DROP
ENTERING AIR
TEMPERATURE
100° 120°
ENTERING WATER TEMPERATURE — 20° WATER TEMPERATURE DROP
140° 160° 180° 200° 220° 240° 260°
30°
40°
50°
60°
0.518
0.439
0.361
0.286
0.666
0.585
0.506
0.429
0.814
0.731
0.651
0.571
0.963
0.878
0.796
0.715
1.120
1.025
0.941
0.857
1.268
1.172
1.085
1.000
1.408
1.317
1.231
1.143
1.555
1.464
1.375
1.286
1.702
1.609
1.518
1.429
70°
80°
90°
100°
0.212
0.140
0.069
0
0.353
0.279
0.207
0.137
0.494
0.419
0.345
0.273
0.636
0.558
0.483
0.409
0.777
0.698
0.621
0.546
0.918
0.837
0.759
0.682
1.060
0.977
0.897
0.818
IA - 17,400 x 1.15 = 20,010 BTU/HR.
– OR –
IB x 1.15 = 17,569 BTU/HR.
1.8
x 2.30 = 4.14 GPM (Applies only to units with
Std. 200° EWT, 60° EAT.) For all others calculate using formula – GPM =
500 x TD
1.201
1.117
1.035
0.955
1.342
1.257
1.173
1.094
280°
1.850
1.755
1.663
1.571
1.483
1.397
1.311
1.230
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 10 15 20 25 30
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.
1.25
5.00
10.00
1.15
2.30
5.00
1.08
1.44
2.00
1.00
1.00
1.00
.94
.74
.60
.90
.59
.40
40
.83
.40
.20
50
.76
.30
.13
60
.72
.24
.07
*Table 7 — MINIMUM WATER FLOW — GPM
MODEL No.
MIN. GPM
MODEL No.
MIN. GPM
HS108A
.125
HS108
3.35
HS118A
.125
HS120
3.60
HS125A
.125
HS132
4.09
HS136A
.125
HS144
4.09
HS18
.75
HS156
4.09
HS24
1.24
HS180
4.34
HS36
1.24
HS204
4.34
HS48
1.49
HS240
4.59
*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
HS60
1.49
HS280
4.59
HS72
1.62
HS300
6.08
150%
1.07
HS84
1.86
HS360
6.08
HS96
3.35
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 specifi c selection of unit heaters with regard to degree of quietness (or loudness);
CATEGORY OF AREA
Apartment, assembly hall, classrooms churches, courtrooms, executive offi ces, hospitals, libraries, museums, theatres.
Dining rooms, general offi ces, recreation areas, small retail stores.
• 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.
The following table outlines sound ratings for various applications. The lower the number, the quieter the unit and the lower the sound requirement.
Restaurants, banks, cafeterias, department stores, public buildings, service stations.
Gymnasiums, health clubs, laundromats, supermarkets.
Garages, small machine shops, light manufacturing.
Factories, foundries, steel mills.
*Depending on specifi c use in these
facilities, size of operation, etc.
CORRECTIONS WHEN USING GLYCOL SOLUTION IN SYSTEM
Propylene
Glycol
SOUND RATING
I
II
III
IV
V
III - VII*
Propylene
Glycol
1 . Heat transfer @180°F 20 % solution with no increase in fl ow rate 50 % solution
2 . G.P.M. Req'd. @180°F, 20° Δ t
(no correction to pump curve)
.97*
.90*
1.10
%*
7 . Freezing Point 55% by volume
50
30
20
%
40%
%
%
-
-28°F
-13°F
+ 4°F
+17°F
*Compared to water.
3 . Pump Head Req'd. @180°F w/increase
1.23
%*
4
5
(water
6
8
. Specify gravity (water = 1.0)
. Pounds/Gallons @60°F
8.3453
Pound/Gallon)
. pH @ 50% by volume
1.045-1.055
8.77
9.5
*
Approximate factors at varying altitudes
Altitude
Sea level - 1000 ft.
1000
ft. - 3000 ft.
3000
5000
7000
ft. - 5000 ft.
ft. - 7000 ft.
ft. - 10000 ft.
Factor
1.00
.958
.929
.900
.871
Horizontal Unit Heaters
Mounting Heights and Throws — Table 9
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
MAXIMUM
MOUNTING HT.
8
8
9
9
8
8
9
9
10
10
10
11
APPROX. MAX.
THROW
20
25
29
29
20
24
28
30
30
29
30
38
MODEL
NO.
HS-108
HS-120
HS-132
HS-144
HS-156
HS-180
HS-204
HS-240
HS-280
HS-300
HS-360
MAXIMUM
MOUNTING HT.
11
12
13
13
13
13
13
14
14
15
15
APPROX. MAX.
THROW
40
40
54
55
55
53
55
57
57
58
60
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 confl icting 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
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
14 5 /
8
14
5
/
8
7
5
/
16
17 1 /
8
17 1 /
8
18
3
/
8
20
7
/
8
8 9 /
16
8 9 /
16
9
3
/
16
10
9
/
16
20 1 /
2
20 1 /
2
21
3
/
4
24
1
/
4
19 5 /
8
9
7 5
13
/
/
16
16
24
5
/
8
12
5
/
16
15
18
24
20
7
/
8
10
7
/
16
25
1
/
4
23 3 /
8
11 11 /
16
27 3 /
4
23 3 /
8
11 11 /
16
27 3 /
4
29
27 7 /
8
27 7 /
8
13 15 /
16
13 15 /
16
30 1 /
4
30 1 /
4
33
3
/
8
16
11
/
16
37
3
/
4
7 1
D
9
/
10 1 /
4
10 1 /
4
10
7
/
8
12
1
/
8
12
2
14
1
/
2
15 1 /
8
15 1 /
8
18
7
/
8
6
6
5
5
6
1
6
6
8
8
1
1
7
7
5
3
1
1
E
6
9
/
/
/
/
/
/
8
/
/
/
8
8
8
8
16
12
5
/
8
6
5
/
16
13 7 /
8
6 5 /
16
13 7 /
8
6 5 /
16
8
8
8
2
2
3
3
3
3
3
3
3
3
15
15
3
3
3
3
3
3
3
3
F
/
/
/
/
/
/
/
/
/
/
16
16
16
16
16
16
16
16
16
16
6
3
3
7
7
7
7
5
9
9
G*
1
1
1
11
5
7
7
7
5
5
/
/
/
/
/
/
/
/
/
/
4
4
2
16
8
16
16
8
8
8
9
9
H*
13
13
17
18
3
3
3
3
3
5
/
/
13
14
14
/
/
/
/
8
8
13 13 /
16
4
4
4
8
12
12
18
22
25
25
J
1
1
1
21
21
1
1
1
31
/
/
2 15 /
16
5 11 /
16
2 15 /
16
5 1 /
16
11 7 /
16
10 15 /
16
14 3 /
4
14 3 /
4
2
15
/
16
2
15
/
16
5
1
/
16
5
11
/
16
11
1
/
16
11
13
/
16
16
18
1
/
2
17 1 /
4
/
/
/
/
4
4
2
4
2
2
K
9 1 /
2
L M N
1 1 /
4
2 1 /
4
12 7 /
8
NO.
OF
LOUVERS
4
NOM.
FAN
DIAM.
9
APPROX.
SHIP
WT .
26
12
1
15
/
2
15
16
1
/
4
18
3
/
4
17
18
3
21
21
22
1
23
23
31
1
1
1
3
3
1
/
/
4
/
/
/
2
/
/
/
2
4
4
4
4
4
1
1
/
4
2
1
/
4
1 1 /
4
1 3 /
4
15 3 /
8
1 1 /
4
1 3 /
4
15 3 /
8
1
1
/
4
1
3
/
4
16
5
/
8
1
1
/
4
1
3
/
4
19
1
/
8
1 1 /
2
1 3 /
4
1
1
/
2
1
3
/
4
1 1 /
2
1 3 /
4
1 1 /
2
1 3 /
4
1
1
/
2
1
3
/
4
2
2
2
1
1
1
3
3
3
/
/
/
4
4
4
12
7
/
8
17 7 /
8
19
1
/
8
21 5 /
8
21 5 /
8
22
7
/
8
26
26
31
1
1
5
/
/
/
8
8
8
5
6
6
7
8
8
8
9
9
9
10
10
13
10
12
12
14
14
16
18
18
18
18
20
20
24
* 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
30
41
41
44
47
49
59
74
74
90
143
154
203
Horizontal Unit Heaters Specifi cations
GENERAL
Furnish and install, where indicated or scheduled on plans
Sterling Model HS horizontal steam/hot water unit heaters.
Unit shall be equipped as specifi ed herein. All units shall be installed in a neat and workmanlike manner in accordance with this specifi cation and the manufacturer's installation instruction.
CASING
Casings shall be 20 gauge die-formed steel. Casing substrates shall be prepared for fi nishing with a hot wash, iron phosphatizing clear rinse, chromic acid rinse and oven drying. Paint fi nish 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 fi ns 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 specifi c 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 classifi cation as follows:
Class I, Group D; all sizes
Class II, Group F; all sizes
Class II, Group G; all sizes
Division I & II Installations
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 fl oor 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
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.
Table 11 - STANDARD SPECIFICATION
MODEL
NO.
HS-108A
H
16
W
18 16
A B
7
/
32
11
1
/
4
4
C
1
/
4
HS-118A
HS-125A
16
16
18
18
16
16
7
7
/
/
32
32
11
11
1
1
/
/
4
4
4
4
1
1
/
/
4
4
HS-136A* 18 1 /
2
20 1 /
2
18 23 /
32
13 3 /
4
5 11 /
16
MODEL
NO.
HS-108A
HS-118A
HS-125A
HS-136A*
NO.
LOUVERS
5
5
5
6
NOM.
FAN
DIAM.
9
10
10
12
APPROX.
SHIP
WT.
22
24
25
31
* DIMENSION “C” IS TO BACK OF MOTOR, NOT MOTOR
CONDUIT CONNECTOR AS SHOWN ABOVE.
NOTE: OSHA type fan guard standard on models HS-108A through HS-136A.
Serpentine Coil Horizontal Unit Heaters Specifi cations
GENERAL
Furnish and install, where indicated or scheduled on plans Sterling Model
HS-A horizontal hot water unit heaters.
Unit shall be equipped as specifi ed herein. All units shall be installed in a neat and workmanlike manner in accordance with this specifi cation and the manufacturer's installation instruction.
CASING
Casings shall be 20 gauge die-formed steel. Casing substrates shall be prepared for fi nishing with a hot wash, iron phosphatizing clear rinse, chromic acid rinse and oven drying. Paint fi nish 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.
COIL MODELS HS108A – HS136A
Coil is a serpentine design with seamless copper tubing. Aluminum fi ns 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.
12
Horizontal Unit Heaters Motor Characteristics
Table 12 - TOTALLY ENCLOSED
MOTOR TYPE
HS Unit
Model
No.
AMP
115/1/60
MCA
18, 24,
108A, 118A
136A
36, 125A
48, 60, 72
84, 96, 108
120, 132,
144, 156,
180, 204, 240
280, 300, 360
0.8
1.4
1.2
1.4
2.2
4.5
5.4
1.0
1.8
1.5
1.8
2.8
5.6
230/1/60
6.8
18, 24,
108A, 118A
136A
36, 125A
48, 60, 72
84, 96, 108
120, 132
144, 156,
180, 204, 240
280, 300, 360
48, 60, 72, 84,
96, 108, 120,
132, 144, 156,
180, 204, 240
280, 300, 360
0.4
1.4
0.6
1.4
2.2
4.5
1.8
0.8
1.8
2.8
5.4
6.8
208-230/460/3/60
2.6-2.6/1.3
0.5
5.6
3.3-3.3/1.6
HP
16W*
1/20*
25W*
1/20*
1/12*
1/3
1/2
16W
1/20†
25W
1/20†
1/12†
1/3†
1/2†
1/2**
* Optional variable speed switch is available.
**These motors are without thermal overload protection
RPM
1140
1550
1000
1550
1000
1000
1140
1100
1550
1000
1550
1000
1000
1140
1100
Table 13 - EXPLOSION PROOF WITH THERMAL OVERLOAD
MOTOR TYPE
HS Unit
Model
No.
AMP MCA HP RPM
115/1/60
48, 60, 72,
84, 96, 108,
120, 132
144, 156,
180, 204
240, 280, 300
360
3.7
5.4
7.4
9.6
4.6
6.8
9.3
230/1/60
12.0
1/6
1/4
1/3***
1/2***
1140
1140
1140
1140
48, 60, 72,
84, 96, 108,
120, 132
144, 156,
180, 204
240, 280, 300
360
3.7
5.4
4.6
6.8
3.7
4.8
4.7
6.0
230/460/3/60
1/6†
1/4†
1/3***
1/2***
1140
1140
1140
1140
144, 156,
180, 204,
240, 280,
300, 360
2.2/1.1
2.8/1.4
1/3 1140
***These motors are 115/230 volts.
†230/1/60 unit has 115/1/60 motor supplied with fi eld 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 infi nitely 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 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.
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 4: Stated AMP draw is Full Load Amp (FLA). AMP draw varies by motor manufacturer ± .2 AMPS. Verify FLA per unit motor data plate.
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.
13
Vertical Unit Heaters Features and General Specifi cations
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 stratifi cation, 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 fi fteen 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 orifi ce for air delivery. Air ports are stamped in the top plate of standard units for easy conversion of low output units.
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.
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 fi ns 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.
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 fi ts 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 infi nitely controllable. All 1/3, 1/2 H.P. and 230V motors operate only at rated speed and CFM – See performance data charts.
14
Vertical Unit Heaters
Steam Performance Data — Table 14
Performance based on 2 # steam pressure at heater with air entering @ 60°F.
STANDARD UNITS
Model
No.
VS-40
VS-62
VS-77
VS-104
VS-125
BTU
Per Hour
41,300
33,600
65,500
52,800
80,600
65,100
101,800
87,900
124,400
Condensate
LBS. Per
Hour
43
55
68
55
83
67
106
91
129
Sq. Ft.
EDR.
172
140
273
220
336
271
424
366
518
Final
Temp.
124
131
121
129
122
130
123
129
124
H.P.
1/40
1/20
1/20
1/8
Motor
RPM
1550
1150
1550
1150
1550
1150
1070
850
1/6 1100
CFM
70° F
Air Basis
595
436
989
706
1200
858
1490
1180
1790
Outlet
Velocity
877
658
1005
727
1220
894
980
783
1170
Sound
Rating
I
II
II
II
III
VS-144
VS-164
VS-200
VS-237
VS-285
VS-317
VS-367
VS-495
152,000
173,000
210,200
249,800
283,800
333,400
386,000
496,000
157
179
208
260
294
345
400
514
633
720
838
1040
1180
1390
1610
2070
123
121
118
115
119
119
118
117
1/2
3/4
3/4
1-1/2
1/6
1/6
1/4
1/4
1100
1100
1100
1100
1100
1140
1140
1160
2220
2620
3200
4180
4430
5210
6140
8020
1045
1230
1495
1205
1275
1500
1770
1640
III
IV
III
IV
IV
IV
IV
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
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
Model
No.
BTU
Per Hour
Condensate
LBS. Per
Hour
Sq. Ft.
EDR.
Final
Temp.
H.P.
Motor
RPM
34,800 36 145 108 1550
VS-40L 1/40
26,000 27 108 111 1150
VS-62L
VS-77L
VS-104L
57,200
45,800
68,000
55,000
85,400
71,200
59
48
71
57
89
74
238
191
283
229
356
296
104
109
106
111
108
111
1/20
1/20
1/8
1550
1150
1550
1150
1070
850
VS-125L 111,000 115 462 107 1/6 1100
CFM
70°
F
Air Basis
668
470
1200
862
1360
995
1640
1290
2180
Outlet
Velocity
950
672
1190
858
1350
992
1050
827
1390
Sound
Rating
I
I
II
II
III
VS-144L
VS-164L
VS-200L
VS-237L
VS-285L
VS-317L
VS-367L
VS-495L
125,000
149,000
176,800
214,900
251,800
291,000
344,000
428,000
130
154
183
224
260
302
356
446
524
620
736
895
1050
1210
1430
1785
109
107
108
104
106
107
108
102
1/2
3/4
3/4
1-1/2
1/6
1/6
1/4
1/4
1100
1100
1100
1100
1100
1140
1140
1160
2360
2920
3390
4500
5040
5700
6600
9380
1080
1340
1560
1270
1420
1610
1870
1860
III
IV
III
IV
IV
IV
IV
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
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
I. CAPACITY
A.
2
lbs. steam, 60° entering air Read output directly from Tables 14 & 15: 41,300 BTU/HR.
B. For higher steam pressures Multiply output from Tables 14 & 15 by appropriate correction and/or E.A.T.'s above or below 60°F factor
II. FINAL AIR TEMPERATURE
A.
2
lbs. steam, 60° entering air Read temperature directly from Tables 14 & 15: 124°F.
EXAMPLE: –
Steam Pressure ____ 10 PSI
Entering Air Temp. ____40°F
41,300
x 1.27 = 52,451 BTU/HR.
B. For capacities calculated in I.B. (above) Output from I.B.
+ E.A.T. = Final Air Temp.
52,451
+ 40 = 121.0°F
1.085 x CFM from Table 14 1.085 x 595
III. FINAL AIR VOLUME
A. 2 lbs. steam, 60° entering air
Nom. CFM Final
460 + Final Air Temp from Table 14 x from = Air
530 Table 14 Volume
460+124
530
x 595 = 655 CFM
B. fi nal air temperatures calculated
In II. B. (above)
Nom. CFM Final
460
+ Final Air Temp from II.B. x from = Air
530 Table 14 Volume
460+121.0
530 x 595 = 652 CFM
IV. CONDENSATE PER HOUR
A.
2
lbs. steam, 60° entering air 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
Table 16 — STEAM CORRECTION FACTORS BASED ON 2 LBS. STEAM 60° E.A.T.
ENTERING AIR STEAM PRESSURE — LBS. PER SQ. IN. (SATURATED)
TEMPERATURE 0 2 5 10 15 20 30 40 50
30°
40°
50°
60°
1.18
1.11
1.03
0.96
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
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
75
1.79
1.71
1.64
1.57
1.49
1.42
1.36
1.29
52,451
= 55.0 LBS./HR.
953
Table 17 — PROPERTIES OF SATURATED STEAM
STEAM PRESSURE IN LBS. PER SQUARE INCH GAUGE
0 2 5 10 15 20 30
Steam
Temperature-°F
Latent Heat of Steam
212.0
970
218.5
966
227.1
961
239.4
953
249.8
946
258.8
940
274.0
929
40
286.7
920
50
912
75
297.7
319.9
891
NOTE 1: Ratings apply only to free inlet and discharge without diffusers.
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 infi nitely controllable. Models 164 through 700 operate at constant speed as indicated in motor data.
NOTE 3: For specifi c motor data refer to motor specifi cations on page 25.
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 fl oor) units are to be mounted at (20 ft.) above fl oor. 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.
Water
Temp.
Drop
10°
Output
MBH
28.8
VS-40 20°
30°
22.7
16.7
VS-40*
VS-62
VS-62*
VS-77
VS-77*
VS-104
VS-104*
VS-125
VS-144
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
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°
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
H
2
O
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
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°
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°
Motor
H.P.
1/40
1/40
1/20
1/20
1/20
1/20
1/8
1/8
1/6
1/6
R.P.M.
1550
1150
1550
1150
1550
1150
1070
850
1100
1100
** 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.
Nominal
CFM
595
436
Outlet
Velocity
877
658
Sound
Rating
I
I
989
II
706
1005
727
II
1200 1220
II
858
1528
1208
1790
2220
894
980
783
1170
1045
II
II
II
III
III
18
Vertical Unit Heaters
Hot Water Performance Data** — Table 19
STANDARD OUTPUT UNITS
Model
No.
Water
Temp.
Drop
Output
MBH
10° 132.4
VS-164
VS-200
VS-237
VS-285
VS-317
VS-367
VS-495
VS-585
VS-700
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
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
294.7
280.8
253.1
—
368.1
333.6
451.2
431.1
391.0
—
519.4
470.9
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
20°
30°
15°
20°
30°
30°
15°
20°
30°
15°
20°
30°
15°
30°
15°
20°
30°
15°
20°
20°
30°
10°
20°
30°
15°
20°
H
2
O
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
104.2°
102.2°
98.0°
—
102.3°
98.3°
104.0°
102.0°
98.1°
—
103.5°
99.5°
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°
Motor
H.P.
1/6
1/4
1/4
1/2
3/4
3/4
1-1/2
1-1/2
3
R.P.M.
1100
1100
1100
1100
1140
1140
1160
1160
1165
** 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.
Nominal
CFM
2620
3200
Outlet
Velocity
1230
1495
4162
4430
5210
6140
8020
9450
11,000
1205
1275
1500
1770
1640
1930
2250
Sound
Rating
IV
III
IV
IV
IV
IV
IV
IV
IV
19
Vertical Unit Heaters
Hot Water Performance Data** — Table 20
LOW OUTPUT UNITS
STANDARD MODEL “VS” UNITS WITH ALL AIR PORTS OPEN
Model
No.
Water
Temp.
Drop
Output
MBH G.P.M.
H
2
O
Press.
Drop
Final
Air
Temp.
Motor
H.P.
VS-40L
10°
20°
23.9
18.9
4.92
1.95
.26
.04
92.9°
86.1° 1/40
R.P.M.
1550
VS-40L*
VS-62L
VS-62L*
VS-77L
VS-77L*
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
10°
20°
30°
21.3
48.9
40.5
32.0
38.5
32.0
14.0
16.7
13.5
—
41.5
34.2
27.0
32.4
26.9
.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
.01
.13
.02
—
.80
.15
.04
.50
.09
.03
.69
.13
.04
.44
.08
94.7°
88.7°
82.8°
93.2°
87.4°
81.7°
95.7°
89.6°
79.3°
92.8°
86.4°
—
91.9°
86.3°
80.7°
1/40
1/20
1/20
1/20
1/20
1150
1550
1150
1550
1150
VS-104L
VS-104L*
30°
10°
20°
30°
10°
20°
25.4
63.7
56.5
49.2
54.5
48.5
1.75
13.13
5.82
3.38
11.24
4.99
.02
1.43
.31
.11
1.06
.23
83.5°
93.5°
89.7°
85.9°
93.5°
89.8°
1/8
1/8
1070
850
VS-125L
30°
10°
20°
42.4
83.7
73.9
2.91
17.24
7.62
.08
2.40
.51
86.1°
95.4°
91.3° 1/6 1100
VS-144L
30°
10°
20°
30°
64.2
95.4
85.5
75.6
4.41
19.66
8.81
5.20
.18
2.92
.65
.24
87.1°
97.3°
93.4°
89.5°
1/6 1100
** 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.
Nominal
CFM
Outlet
Velocity
668 950
470
1200
862
1360
995
1752
1499
2180
2360
672
1190
858
1350
992
1050
827
1390
1080
Sound
Rating
I
I
II
II
II
II
II
II
III
III
20
Vertical Unit Heaters
Hot Water Performance Data** — Table 21
LOW OUTPUT UNITS
STANDARD MODEL “VS” UNITS WITH ALL AIR PORTS OPEN
Model
No.
Water
Temp.
Drop
Output
MBH G.P.M.
H
2
O
Press.
Drop
Final
Air
Temp.
Motor
H.P.
10° 112.3
23.15
2.70
95.4°
VS-164L
VS-200L
VS-237L
20°
30°
10°
20°
30°
10°
20°
30°
100.7
89.2
135.8
121.8
107.3
168.5
153.8
139.1
10.38
6.13
27.98
12.52
7.37
34.72
15.85
9.56
.60
.22
3.85
.85
.32
6.75
1.56
.61
91.8°
88.1°
96.9°
93.0°
89.2°
94.5°
91.4°
88.4°
1/6
1/4
1/4
R.P.M.
1100
1100
1100
VS-285L
10°
20°
30°
10°
20°
30°
10°
20°
30°
188.9
180.1
162.7
220.9
210.6
189.9
25.95
18.56
11.18
30.35
21.70
13.05
35.82
25.61
15.40
3.92
2.10
.82
5.26
94.5°
92.9°
89.7°
1/2 1100
VS-317L
VS-367L
VS-495L
10°
20°
30°
260.7
248.5
224.2
—
310.5
—
32.00
19.35
2.81
1.09
5.24
2.80
1.09
—
4.23
1.67
95.7°
94.1°
90.7°
96.4°
94.7°
91.3°
—
90.5°
87.7°
3/4
3/4
1-1/2
1140
1140
1160
VS-585L
10°
20°
281.7
394.4
377.0
54.19
38.85
6.83
3.68
95.3°
93.7° 1-1/2 1160
30°
10°
20°
342.2
—
23.51
1.45
90.6°
VS-700L
30°
453.7
411.7
—
46.76
28.28
—
4.11
1.62
—
95.1°
91.9°
3 1165
** 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.
Nominal
CFM
Outlet
Velocity
2920
3390
4507
5040
5700
6600
9380
10,300
11,900
1340
1560
1270
1420
1610
1870
1860
2060
2380
Sound
Rating
IV
III
IV
IV
IV
IV
IV
IV
IV
21
Vertical Unit Heaters Hot Water Calculations and Correction Factors
I. CAPACITY @ 20° TD:
A. 200° EWT, 60° EAT
B. For EWT and/or EAT above or below Standard
Read output directly from Tables 18 - 21,
22,700 BTU/HR (Ref., Std. VS-40, p. 18).
Multiply output from Tables 18 - 21 by factor from Table 22 (below).
EXAMPLE: –
Entering Air Temp. ___________________40°F
Water Temperature Drop ______________10°F
22,700 x .878 = 19,931 BTU/HR.
II. CAPACITY AT OTHER TD's
A. TD's
III. GPM AT OTHER TD's
A. TD's
IV. PRESSURE LOSS AT OTHER TD's
Multiply output obtained in IA. or IB.
(above) by appropriate factor from Table 23
(below)
Multiply GPM of unit for 20° TD, from Table 18 by appropriate factor from Table 23 (below).
Multiply P.D. of unit for 20° TD, from Tables 18 - 21 by appropriate factor from Table 23 (below).
IA - 22,700 x 1.15 = 26,105 BTU/HR.
– OR –
IB x 1.15 = 22,921 BTU/HR.
2.34
x 2.30 = 5.38 GPM (Applies only to units with
Std. 200° EWT, 60° EAT.) For all others calculate using formula – GPM =
500 x TD
.06
x 5.00 = .30 Ft. H
2
O
Table 22 — HOT WATER CONVERSION FACTORS BASED ON 200° ENTERING WATER
60°
ENTERING AIR 20° 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
ENTERING WATER TEMPERATURE — 20° WATER TEMPERATURE DROP
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
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.
260°
1.702
1.609
1.518
1.429
1.342
1.257
1.173
1.094
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 10 15 20 25 30
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.
1.25
5.00
10.00
1.15
2.30
5.00
1.08
1.44
2.00
1.00
1.00
1.00
.94
.74
.60
.90
.59
.40
40
.83
.40
.20
280°
1.850
1.755
1.663
1.571
1.483
1.397
1.311
1.230
50
.76
.30
.13
300°
1.997
1.908
1.824
1.717
1.630
1.545
1.462
1.371
60
.72
.24
.07
*Table 24 — MINIMUM WATER FLOW — GPM
MODEL No.
40 62 77
MIN. GPM
.55
.55
.55
104
.55
144
.82
164
.82
200
1.10
*Table 25 — HEATING CAPACITY FACTORS FOR VARIOUS RATES OF WATER FLOW
% of Rated Water Flow
25% 50% 75% 100% 125%
Btu/Hr Heating Capacity
.80
.89
.96
1.00
1.04
237
1.10
150%
1.07
317
1.10
367
1.10
175%
1.10
22
Vertical Unit Heaters Dimensional Data
Figure 6 Figure 7
K
H H
K
V V
G A A U
K
H
H
K
STEAM
RETURN
OR
HOT WATER
SUPPLY
F
B
T
P
R
R
G
A
R
(4) MOUNTING HOLES
THREAD TAPS
3 /
8
- 16 FOR MODELS 40-77
CEILING
P
T
L
STEAM
SUPPLY
OR
HOT WATER
RETURN
E
C
S
D
V
F
B
S
C
E
R G
A
R
(4) MOUNTING HOLES 3 / 8 - 16 FOR MODELS 104-367
THREAD TAPS 1 / 2 - 13 FOR MODELS 495-700
CEILING
P
P
T
T
L
STEAM
SUPPLY
OR
HOT WATER
RETURN
STEAM
RETURN
OR
HOT WATER
SUPPLY
D
Table 25 - FIGURE 6 — MODEL “VS” UNIT HEATER ROUGHING IN DIMENSIONS
Unit
Size
Fan
Dia.
A B C D E F G H K
L
(Min.)
P
(NPT) R
40 11 1 /
4
18 1 /
4
4 5 /
8
1 1 /
4
11 3 /
4
1 3 /
4
4 11 1 3 /
8
1 7 /
8
7 1 1 /
2
3 5 /
8
62
77
13 1 /
2
13 1 /
2
21 1 /
4
21 1 /
4
4 5 /
8
6 1 /
8
1 5 /
8
1 5 /
8
14 1 /
2
14 5 /
8
1 3 /
4
1 1 /
4
4
3
14
14
1 3 /
8
1 3 /
8
1 7 /
8
1 7 /
8
7
7
1 1 /
2
1 1 /
2
3 5 /
8
3 5 /
8
S
6 5 /
8
7 1 /
8
8 5 /
8
T
2 3 /
4
2 3 /
4
2 3 /
4
U
11
14
14
V
3 5 /
8
3 5 /
8
3 5 /
8
Approx. Ship
Wt. (lbs.)
32
40
43
Table 26 - FIGURE 7 — MODEL “VS” UNIT HEATER ROUGHING IN DIMENSIONS
Unit Fan
L P
Size Dia.
A B C D E F G H K
(Min.)
(NPT) R
104
125
144
164
200
237
285
317
367
495
585
700
16 3 /
4
16 3 /
4
19 3 /
4
19 3 /
4
19 3 /
4
25 1 /
4
25 1 /
4
25 1 /
4
25 1 /
4
30 1 /
2
30 1 /
2
30 1 /
2
25 1 /
4
25 1 /
4
29 1 /
2
29 1 /
2
29 1 /
2
37 1 /
2
37 1 /
2
37 1 /
2
37 1 /
2
42 1 /
2
42 1 /
2
42 1 /
2
6 1 /
8
6 1 /
8
6 1 /
8
6 1 /
8
7 5 /
8
7 5 /
8
7 5 /
8
7 5 /
8
9 1 /
8
9 1 /
8
12 1 /
8
13 5 /
8
2 1 /
2
2 1 /
2
2 3 /
8
2 3 /
8
2 3 /
8
3 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
17 1 /
2
17 1 /
2
20 5 /
8
20 5 /
8
20 5 /
8
26 3 /
8
26 3 /
8
26 3 /
8
26 3 /
8
31 1 /
4
31 1 /
4
31 1 /
4
1 1 /
8
1 3 /
4
1 1 /
4
1 3 /
4
2 1 /
2
1 1 /
2
1 1 /
4
2 1 /
8
2 1 /
2
1 5 /
8
2 1 /
8
3 1 /
2
3 1 /
2
3 1 /
2
4 1 /
2
4 1 /
2
4 1 /
2
3 1 /
2
3 1 /
2
4 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
4 1 /
2
17 1 /
2
17 1 /
2
20 1 /
2
20 1 /
2
20 1 /
2
28 1 /
2
28 1 /
2
28 1 /
2
28 1 /
2
30 1 /
2
30 1 /
2
30 1 /
2
1 3 /
8
1 3 /
8
1 3 /
4
1 3 /
4
1 3 /
4
1 3 /
4
1 3 /
4
1 3 /
4
1 3 /
4
2 1 /
4
2 1 /
4
2 1 /
4
2 3 /
4
2 3 /
4
3 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
3 1 /
2
4 1 /
4
4 1 /
4
4 1 /
4
7
7
7
7
7
7
7
7
7
7
7
7
1 1 /
2
1 1 /
2
2 1 /
2
2 /
2
2 /
2
2 1 /
2
2 1 /
2
2 1 /
2
2 1 /
2
2 1 /
2
2 1 /
2
2 1 /
2
4 1 /
8
4 1 /
8
4 1 /
2
4 1 /
2
4 1 /
2
4 3 /
4
4 3 /
4
4 3 /
4
4 3 /
4
6 1 /
2
6 1 /
2
6 1 /
2
11 3 /
4
12 3 /
4
14 1 /
8
14 1 /
4
17 3 /
4
20 1 /
4
S
9 1 /
8
9 3 /
4
9 5 /
8
10 1 /
8
12 1 /
2
11 5 /
8
T
2 3 /
4
2 3 /
4
2 3 /
4
2 3 /
4
2 3 /
4
2 3 /
4
2 3 /
4
2 3 /
4
2 3 /
4
3 1 /
2
3 1 /
2
3 1 /
2
U
17 1 /
2
17 1 /
2
20 1 /
2
20 1 /
2
20 1 /
2
18 1 /
2
18 1 /
2
18 1 /
2
18 1 /
2
30 1 /
2
30 1 /
2
30 1 /
2
V
4 1 /
8
4 1 /
8
4 1 /
2
4 1 /
2
4 1 /
2
9 3 /
4
9 3 /
4
9 3 /
4
9 3 /
4
6 1 /
2
6 1 /
2
6 1 /
2
Approx. Ship
Wt. (lbs.)
63
64
80
80
86
134
139
139
145
294
307
366
Table 27 - FIGURE 8
LOUVER CONE DIFFUSER ROUGHING IN DIMENSIONS
Unit
Size A B C D
No. of
Louvers
40 16 1 /
2
14 1 /
4
6 1 /
2
2 5 /
8
8
62 & 77
104 & 125
144, 164 & 200
237, 285, 317 & 367
495, 585, 700
20 1 /
4
24 1 /
4
28 3 /
8
35 1 /
2
41 1 /
2
17 1 /
8
21 1 /
8
24 3 /
4
31 1 /
2
37 1 /
4
8 1 /
2
9 3 /
4
11 1 /
2
13 3 /
4
17 1 /
2
3 1 /
8
3 15 /
16
4 5 /
8
4 5 /
8
4 3 /
4
8
8
8
12
12
Figure 8
C
D
A
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
14.0
17.0
11.0
13.5
17.5
21.5
15.0
18.5
15.0
18.5
11.0
13.5
18.0
22.0
13.0
17.0
12.0
14.5
9.5
11.5
15.0
19.0
11.5
14.0
10.5
12.5
8.0
9.0
12.5
14.5
9.0
10.5
16.0
19.5
21.0
26.0
15.5
19.0
Steam Pressure (PSI)
5 10 50 75
11.0
13.5
9.0
11.5
14.5
17.5
12.5
15.0
11.5
13.5
8.5
11.0
14.0
18.0
10.5
13.5
9.5
11.5
8.0
9.0
12.0
16.0
8.0
11.5
8.0
10.0
8.0
8.0
9.5
11.5
8.0
8.5
13.5
16.0
17.0
21.5
12.0
15.5
11.5
14.0
9.5
12.0
15.0
18.5
13.0
16.0
12.0
15.5
9.0
11.5
15.0
19.0
11.0
14.0
10.0
12.0
8.0
9.5
12.5
16.5
9.5
12.0
9.0
11.0
8.0
8.0
10.5
12.0
8.0
9.0
14.0
17.0
17.5
22.5
13.0
16.0
13.0
16.0
10.5
13.0
16.5
20.5
14.5
18.0
14.0
17.5
10.5
13.0
17.5
21.0
12.0
16.0
11.5
14.0
9.0
11.0
14.5
18.5
11.0
13.5
10.0
12.0
8.0
8.5
12.0
13.5
8.5
10.0
15.5
18.5
20.0
25.0
14.5
18.0
13.5
16.5
10.5
13.0
17.0
21.0
14.5
18.0
14.5
18.0
10.5
13.0
17.5
21.0
12.5
16.5
11.5
14.0
9.0
11.0
14.5
18.5
11.0
13.5
10.0
12.0
8.0
8.5
12.0
14.0
8.5
10.0
15.5
19.0
20.5
25.5
15.0
18.5
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
Steam Pressure (PSI)
23.0
29.0
26.5
33.5
24.0
30.5
28.0
34.0
17.0
21.0
20.0
25.0
19.0
24.0
24.0
29.0
27.0
34.5
30.0
37.0
30.5
39.0
33.5
42.0
17.5
23.0
21.0
26.0
16.0
19.5
19.0
23.5
75
14.0
18.0
14.0
18.0
17.5
22.5
24.0
30.0
27.5
35.0
25.0
32.0
29.0
35.0
17.5
22.0
21.0
26.0
20.0
25.0
25.0
30.0
28.0
36.0
31.0
39.0
32.0
40.0
35.0
44.0
18.5
24.0
22.0
27.0
17.0
20.5
20.0
24.5
50
15.0
18.5
14.5
19.0
18.5
23.5
28.0
35.0
31.5
40.0
29.0
36.0
34.0
42.5
20.5
25.5
25.0
31.0
23.0
29.0
28.5
35.0
33.0
41.5
36.0
45.5
37.5
47.0
41.5
52.0
21.5
27.0
25.0
31.0
19.5
24.0
23.5
28.5
5
17.5
22.0
17.5
22.0
21.5
27.0
34.0
30.5
39.0
28.5
35.5
33.0
41.5
32.0
25.0
24.5
30.0
22.0
28.0
28.0
34.0
27.5
40.5
35.0
44.5
36.5
46.0
40.5
51.0
26.5
24.5
30.5
19.0
23.5
23.0
28.0
20.0
10
17.5
21.5
17.0
21.5
21.0
26.5
21.0
2
32.5
41.0
29.5
36.5
35.0
43.5
34.0
42.5
25.5
32.0
24.0
30.0
29.0
36.0
28.5
35.5
25.5
31.5
20.0
25.0
24.0
29.5
21.0
26.0
18.0
22.5
18.0
22.5
22.0
27.5
22.0
27.5
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
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 fl oor 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 defl ect 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 fl oor 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.
40
62, 77
104
125, 144, 164
200, 237
285
AMP
115/1/60
MCA
1.23** 1.6
2.1**
1.2**
2.3**
3.6**
2.6
1.5
2.9
4.5
5.4** 6.8
208-230/460/3/60
40, 62, 77,
104, 125,
144, 164
200, 237
285
317, 367
495, 585
700
0.98-1.1/0.55
1.2-1.4/0.7
1.2-1.4/0.7
1.8-2.0/1.0
3.1-3.2/1.6
5.0-4.4/2.2
1.5-1.8/0.9
2.3-2.5/1.3
3.9-4.0/2.0
6.3-5.5/2.8
9.6-8.2/4.1
12.0-10.3/5.1
575/3/60
40, 62, 77,
104, 125,
144, 164,
200, 237
285
317, 367
495, 585
700
0.6
0.8
1.3
2.0
3.8
0.8
1.0
1.6
2.5
4.7
HP
1/40*
1/20*
1/8*
1/6
1/4
1/2
1/6
1/4
1/2
3/4
1-1/2
3
1/3
1/2
3/4
1-1/2
3
* Optional variable speed switch is available.
** These motors have automatic thermal overload protection or impedance protection.
RPM
1140
1140
1140
1140
1160
1165
1140
1140
1140
1160
1165
1550
1550
1070
1100
1100
1100
Table 30 - EXPLOSION PROOF WITH THERMAL OVERLOAD
MOTOR TYPE
VS Unit
Model
No.
AMP
115/1/60
MCA HP RPM
40, 62, 77,
104, 125
144, 164
200, 237
285
3.8
4.8
4.4
5.5
7.8
9.8
208-230/460/3/60
1/6
1/4
1/2
1140
1140
1140
40, 62, 77,
104, 125
144, 164
200, 237
285
317, 367
495, 585
700
1.0-1.0/0.5
1.3-1.3/0.6
1.1-1.1/0.55
1.4-1.4/0.7
1.9/0.95*** 2.4/1.2
3.1-3.2/1.6
5.0/2.5***
10.0/5.0***
3.9-4.0/2.0
6.5/3.3
12.5/6.3
1/6
1/4
1/2
3/4
1-1/2
3
1140
1140
1140
1145
1150
1150
*** These motors are 230/460 volts only.
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 infi nitely controllable. Models 164 through 700 operate at constant speed as indicated in motor data.
NOTE 2: Stated draw is Full Load (FLA). AMP draw varies by motor manufacturer ± .2 AMPS.
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.
25
Horizontal and Vertical Unit Heater
Piping and Installation
The illustrations below depict different typical piping confi gurations. Proper selection should be based on the operational characteristics of the source supply. For selection and sizing of piping, traps, fi lters 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 qualifi ed 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
Figure 13
26
Wiring Diagrams — Figure 14
1 PHASE LINE 1 PHASE LINE 1 PHASE LINE
MANUAL STARTING
SWITCH
MOTOR
MANUAL STARTING
SWITCH
1 PHASE LINE
MAGNETIC
STARTING SWITCH
MOTOR
THERMOSTAT
MOTOR
MANUAL STARTING
SWITCH
THERMOSTAT
MOTOR
SPEED CONTROLLER MOTOR
MANUAL CONTROL WITH
SINGLE PHASE MOTOR
ROOM THERMOSTAT
THERMOSTATIC CONTROL
WITH MANUAL STARTER
THERMOSTATIC CONTROL
USING MAGNETIC STARTER
OPERATING SEVERAL UNITS
SPEED CONTROLLER WITH
MANUAL STARTING SWITCH
1 PHASE LINE
MAGNETIC
STARTING SWITCH
THERMOSTAT
MOTORS
SPEED
CONTROLLERS
SPEED CONTROLLERS WITH
MAGNETIC STARTING SWITCH
FOR OPERATING SEVERAL UNITS
3 PHASE LINE
MANUAL STARTING
SWITCH
MOTOR
MANUAL CONTROL WITH
THREE PHASE MOTOR
3 PHASE LINE
MAGNETIC
STARTING SWITCH
THERMOSTAT
MOTORS
THERMOSTATIC CONTROL
OF SEVERAL THREE
PHASE UNITS
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 suffi cient 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.
This warranty does not cover damages or failure due to improper installation or piping, corrosive atmospheric conditions, misuse or negligence by others.
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.
27
Horizontal
Hydronic Unit Heaters
Model Number Description
Digit H X X X — 1 2 3 4 5 6 7 8 9 †
Item
(Internal use Only)
1, 2
- Unit Type [UT]
HS - Horizontal
3
- Coil Type [CT]
A - Serpentine
B - Standard (Header Type)
4, 5, 6 - Capacity [CA]
Coil Type [A] Serpentine*
108
- 8,030 BTU/HR
118 - 18,400 BTU/HR
*Based on 200° EWT, 60° EAT, 20° T.D.
125
- 24,800 BTU/HR
136 - 35,900 BTU/HR
Coil Type [B] Standard**
018 - 18,000 BTU/HR 096 - 96,000 BTU/HR 204 - 204,000 BTU/HR
024
- 24,000 BTU/HR 108 - 108,000 BTU/HR 240 - 240,000 BTU/HR
036 - 36,000 BTU/HR 120 - 120,000 BTU/HR 280 - 280,000 BTU/HR
048
- 48,000 BTU/HR
132
- 132,000 BTU/HR
300
- 300,000 BTU/HR
060 - 60,000 BTU/HR
072
- 72,000 BTU/HR
144
156
- 144,000 BTU/HR
- 156,000 BTU/HR
360 - 360,000 BTU/HR
084 - 84,000 BTU/HR
**Based on 2 psi steam
180 - 180,000 BTU/HR
7
- Supply Voltage [SV]
1
- 115/1/60
5
- 230/3/60
3 - 230/1/60
4
- 208/3/60
6 - 460/3/60
Z - Other
8
- Motor Type [MT]
1
- Standard Motor
2 - Explosion Proof
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 prefi x. 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
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
U0 - Manual Starters - 3 Phase Q7 -
Vertical
Hydronic Unit Heaters
Model Number Description
Digit V X X X — 1 2 3 4 5 6 7 8 9 †
Item
(Internal use Only)
1, 2
- Unit Type [UT]
VS - Vertical
3
- Coil Type [CT]
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
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
6
- 460/3/60
4
- 208/3/60
7
- 575/3/60
5
- 230/3/60 Z - Other
8
- Motor Type [MT]
1
- Standard
2
- Explosion Proof
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 prefi x. i.e: G6 becomes AS-G6.
FACTORY INSTALLED
M6 - OSHA Fan Guard
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 Phase Q7 -
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”)
260 NORTH ELM ST. WESTFIELD, MA 01085
(413) 564-5540 • FAX: (413) 562-5311 www.sterlinghvac.com
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