VFB Series
VSB Series
VCB Series
Application
Guide
WCB Series
Vertical Console
Fan Coils
300-1200 CFM
This application guide includes expanded cooling and heating data as well as
typical connection diagrams and standard valve/piping package configurations.
Table of Contents
3 Row Cooling and Heating Data .......................... 2
4 Row Cooling and Heating Data .......................... 3
1 Row Heating Data .............................................. 4
Typical Connection Diagrams................................ 5
Valve/Piping Packages ...................................6 & 7
Model Nomenclature ............................................. 8
FIRST OPERATIONS, LP - P.O. Box 270969 - Dallas,Texas 75227 - Ph. (214) 388-5751 - Fax (214) 388-2255 - www.firstco.com
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4 Row Performance Data
CHILLED WATER COOLING CAPACITY - 4 ROW
45°F ENTERING WATER
42°F ENTERING WATER
UNIT
SIZE
(ALL
P.D.
(FT.
WTR.)
80°F DB/67°F WB
ENTERING AIR
75°F DB/63°F WB
ENTERING AIR
80°F DB/67°F WB
ENTERING AIR
75°F DB/63°F WB
ENTERING AIR
CFM GPM
TOTAL SENS. TEMP. TOTAL SENS. TEMP. TOTAL SENS. TEMP. TOTAL SENS. TEMP.
MODELS)
MBH
MBH RISE MBH
MBH RISE MBH
MBH RISE MBH
MBH RISE
1.0
280
1.8
6.5
13.9
6.7
8.9
9.8
6.1
7.0
7.3
14.8
9.9
7.2
5.7
7.5
8.3
5.4
6.1
6.4
11.3
7.5
5.5
8.1
10.8
11.8
6.3
7.3
7.7
16.2
10.8
7.9
6.2
8.2
9.0
5.5
6.4
6.7
12.3
8.2
6.0
2.0
(HIGH)
3.0
3
4
1.0
240
1.8
6.5
13.9
6.5
8.3
9.1
5.5
6.3
6.6
14.4
9.2
6.7
5.5
7.0
7.6
4.9
5.5
5.7
11.0
7.0
5.1
7.8
10.0
10.9
5.8
6.6
7.0
15.6
10.0
7.2
6.0
7.6
8.3
5.1
5.7
6.0
12.0
7.6
5.5
2.0
(MED)
3.0
1.0
400
2.4
8.2
16.8
10.5
12.3
13.4
8.1
9.6
10.2
18.1
13.1
9.8
8.1
10.0
11.3
8.1
8.4
8.9
16.1
10.0
7.5
9.9
14.3
16.1
8.4
10.0
10.7
19.7
14.3
10.7
8.9
10.9
12.3
8.4
8.7
9.3
17.8
10.9
8.2
2.0
3.0
(HIGH
1.0
320
2.4
8.2
16.8
9.8
11.1
12.0
7.1
8.3
8.8
17.5
11.9
8.8
6.7
9.1
10.0
6.3
7.2
7.6
13.4
9.1
6.7
9.5
12.9
14.3
7.4
8.7
9.2
19.1
12.9
9.6
7.3
9.9
10.9
6.5
7.5
7.9
14.6
9.9
7.3
2.0
3.0
(MED)
2.5
600
5.6
10.2
16.0
17.0
18.6
19.6
13.2
14.1
14.7
13.4
11.0
9.2
12.8
14.7
15.8
11.6
12.4
12.8
10.2
8.4
7.0
18.2
21.0
22.6
13.7
14.8
15.4
14.6
12.0
10.0
139
16.1
17.3
12.1
12.9
13.4
11.1
9.2
7.7
3.5
(HIGH)
4.5
6
2.5
430
5.6
10.2
16.0
14.7
15.8
16.5
10.7
11.3
11.7
11.9
9.4
7.7
11.3
12.6
13.3
9.3
9.8
10.1
9.1
7.2
5.9
16.2
18.0
19.0
11.2
11.9
12.3
13.0
10.3
8.4
12.4
13.7
14.5
9.7
10.3
10.6
9.9
7.8
6.4
3.5
(MED)
4.5
4.0
800
(HIGH)
6.0
8.9
13.3
18.4
22.1
23.8
25.1
18.3
19.0
19.6
12.3
10.6
9.3
18.7
20.2
21.2
16.1
16.6
17.1
9.4
8.1
7.1
26.7
28.8
30.3
19.2
19.9
20.5
13.4
11.5
10.1
20.4
22.0
23.1
16.7
17.4
17.8
10.2
8.8
7.7
5.0
8
4.0
680
(MED)
6.0
8.9
13.3
18.4
20.7
22.0
22.9
16.5
17.0
17.4
11.4
9.7
8.4
17.4
18.5
19.3
14.4
14.8
15.2
8.7
7.4
6.4
24.8
26.4
27.6
17.2
17.9
18.3
12.4
10.6
9.2
19.0
20.2
21.1
15.0
15.5
15.8
9.5
8.1
7.0
5.0
5.5
5.9
10.2
15.4
29.7
31.0
32.1
23.8
25.0
25.8
11.1
9.0
7.6
23.4
25.9
27.4
20.9
21.9
22.5
8.5
6.9
5.8
33.3
37.0
39.1
24.8
26.2
27.0
12.1
9.9
8.2
15.5
28.2
29.9
21.7
22.9
23.5
9.3
7.5
6.3
1000
7.5
(HIGH)
9.5
10
12
5.5
5.9
10.2
15.4
27.6
28.8
29.7
21.6
22.7
23.4
10.4
8.4
7.0
21.7
24.0
25.4
18.9
19.8
20.4
7.9
6.4
5.3
31.0
34.3
36.2
22.6
23.8
24.6
11.3
9.1
7.6
23.7
26.2
27.7
19.7
20.7
21.3
8.6
7.0
5.8
880
7.5
(MED)
9.5
7.5
10.7
13.7
17.0
34.8
36.3
37.6
29.4
29.9
30.4
10.4
9.5
8.8
29.9
30.9
31.8
25.8
26.2
26.6
8.0
7.3
6.7
42.6
44.1
45.4
30.8
31.3
31.8
11.4
10.4
9.6
32.6
33.7
34.7
26.9
27.3
27.7
8.7
7.9
7.3
1200
8.5
(HIGH)
9.5
7.5
1030
10.7
13.7
17.0
35.8
37.0
38.0
26.2
26.7
27.0
9.5
8.7
8.0
27.4
28.3
29.0
22.9
23.3
23.6
7.3
6.7
6.1
39.0
40.3
41.4
27.4
27.9
28.4
10.4
9.5
8.7
29.8
30.8
31.7
23.9
24.3
24.6
7.9
7.2
6.7
8.5
(MED)
9.5
HOT WATER HEATING CAPACITY - 4 ROW
HEATING BTUH (1000)
AT ENTERING WATER
TEMPERATURE
HEATING BTUH (1000)
AT ENTERING WATER
TEMPERATURE
UNIT
SIZE
(ALL
UNIT
SIZE
(ALL
P.D.
(FT.
WTR.)
P.D.
(FT.
WTR.)
CFM
GPM
CFM
GPM
MODELS)
MODELS)
140°F
160°F
180°F
140°F
160°F
180°F
1.5
2.5
3.5
3.8
9.9
18.5
15.8
16.7
17.2
20.3
21.5
22.1
24.8
26.3
27.0
3.0
4.5
6.0
5.4
11.0
18.4
41.5
44.2
45.6
53.3
56.8
58.6
65.2
69.4
71.7
280
(HIGH)
800
(HIGH)
3
4
6
8
1.5
2.5
3.5
3.8
9.9
18.5
14.2
14.9
15.2
18.2
19.1
19.6
22.3
23.4
24.0
3.0
4.5
6.0
5.4
11.0
18.4
37.3
39.4
40.6
47.9
50.7
52.2
48.6
61.9
63.7
240
(MED)
680
(MED)
1.0
2.0
3.0
2.4
8.2
16.8
19.9
22.8
23.9
25.6
29.3
30.7
31.3
35.8
37.6
6.0
8.0
10.0
6.9
11.4
16.9
58.6
60.7
62.0
75.3
78.0
79.8
92.0
95.3
97.4
400
(HIGH)
1000
(HIGH)
10
12
1.0
2.0
3.0
2.4
8.2
16.8
17.4
19.5
20.2
22.4
25.0
26.0
27.4
30.6
31.8
6.0
8.0
10.0
6.9
11.4
16.9
53.5
55.3
56.4
68.8
71.1
72.5
84.1
86.9
88.6
320
(MED)
880
(MED)
2.5
3.5
4.5
5.6
10.2
16.0
31.7
33.4
34.4
40.7
43.0
44.2
49.8
52.5
54.0
6.0
8.0
10.0
7.0
12.2
18.7
68.7
71.4
73.1
88.3
91.8
94.0
108.0
112.2
114.9
600
(HIGH)
1200
(HIGH)
2.5
3.5
4.5
5.6
10.2
16.0
25.3
26.3
26.9
32.5
33.8
34.6
39.8
41.4
42.3
6.0
8.0
10.0
7.0
12.2
18.7
61.8
64.0
65.4
79.5
82.3
84.1
97.2
100.3
102.8
430
(MED)
1030
(MED)
Note: Ratings at 70°F entering air temperature
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1 Row Performance Data
HOT WATER HEATING CAPACITY - 1 ROW
HEATING BTUH (1000)
AT ENTERING WATER
TEMPERATURE
HEATING BTUH (1000)
AT ENTERING WATER
TEMPERATURE
UNIT
SIZE
(ALL
UNIT
SIZE
(ALL
P.D.
(FT.
WTR.)
P.D.
(FT.
WTR.)
CFM
GPM
CFM
GPM
MODELS)
MODELS)
140°F
160°F
180°F
140°F
160°F
180°F
1.0
1.75
2.5
3.4
9.3
17.7
8.2
8.9
9.0
10.6
11.4
11.6
12.9
13.9
14.2
1.0
1.5
2.0
5.7
11.6
19.2
17.6
19.8
21.1
22.7
25.4
27.1
27.7
31.1
33.1
280
(HIGH)
800
(HIGH)
3
4
6
8
1.0
1.75
2.5
3.4
9.3
17.7
7.6
8.1
8.3
9.8
10.4
10.7
12.0
12.8
13.1
1.0
1.5
2.0
5.7
11.6
19.2
16.6
18.5
19.6
21.4
23.8
25.2
26.2
29.1
30.8
240
(MED)
680
(MED)
1.0
1.75
2.5
4.4
11.7
21.9
11.2
12.3
12.7
14.4
15.8
16.3
17.6
19.3
20.0
2.5
3.5
4.5
7.3
12.9
19.7
21.9
23.2
23.7
28.2
29.8
30.5
34.4
36.4
37.3
400
(HIGH)
1000
(HIGH)
10
12
1.0
1.75
2.5
4.4
11.7
21.9
10.1
10.9
11.3
13.0
14.1
14.5
15.9
17.2
17.7
2.5
3.5
4.5
7.3
12.9
19.7
20.6
21.8
22.4
26.5
28.0
28.8
32.4
34.2
35.2
320
(MED)
880
(MED)
1.0
1.75
2.5
5.0
13.3
24.9
14.6
16.6
17.4
18.8
21.4
22.4
23.0
26.2
27.4
2.5
3.5
4.5
7.7
13.9
21.8
25.8
27.5
28.4
33.1
35.4
36.5
40.5
43.2
44.7
600
(HIGH)
1200
(HIGH)
1.0
1.75
2.5
5.0
13.3
24.9
12.8
14.1
14.7
16.5
18.2
18.9
20.1
22.2
23.1
2.5
3.5
4.5
7.7
13.9
21.8
24.1
25.6
26.4
31.0
32.9
33.9
37.9
40.4
41.4
430
(MED)
1030
(MED)
NOTE: Ratings at 70°F entering air temperature
In keeping with its policy of continuous progress and product
improvement, First Operations reserves the right to make
changes without notice. Maintenance for all First Co. products is
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Model Number Nomenclature
12 VC B 0 - 126 - 31 R - 2B - N1
CFM (100'S)
3,4,6,8,10,12
Control Options(see below)
NC = No Controls
Unit Style
Valve Package
VCB - Concealed
VSB - Cabinet slope top
VFB - Cabinet flat top
See page 6 & 7
Coil Connection
R - Right Hand
L - Left Hand
WCB - Recessed wall
Vintage
Coil Type
3 - 3 row
4 - 4 row
Electric Heat (KW)
31 - 3 row cool, 1 row heat
41 - 4 row cool, 1 row heat
Unit Voltage
126 - 120V-1PH-60Hz
246 - 208/240V-1PH-60Hz
225 - 220V-1PH-50Hz
CONTROL OPTIONS FOR ELECTRIC VALVE PACKAGES
2 Pipe - Valve Cycle
SYSTEM
THERMOSTAT
CONTROLS
CONTROL
VALVE TYPE
CHANGEOVER CONTROL
and LOCATION
THERMOSTAT
ORDER OPTION
Heat-Off-Cool
Constant Fan
Hi-Med-Low
Motorized 2-way
or 3-way.
Normally closed.
Manual
Hot - Cool Switch
on Thermostat
A1 - Unit Mount
A2 - Wall Mount
A3 - Unit Tamperproof
Heating and
Cooling
Motorized 3-way
Normally closed.
Automatic (1)
Aquastat - Factory
B1 - Unit Mount
B2 - Wall Mount
On-Off
Mounted on Supply Line
B3 - Unit Tamperproof
Constant Fan
Hi-Med-Low
Motorized 2-way
or 3-way
Manual
Summer-Winter Switch
C1 - Unit Mount
C2 - Wall Mount
Normally closed.
(switch must be field supplied)
C3 - Unit Tamperproof
On-Off
Motorized 2-way
or 3-way.
Normally closed.
D1 - Unit Mount
D2 - Wall Mount
D3 - Unit Tamperproof
Cooling Only Constant Fan
None
None
Hi-Med-Low
On-Off
Heating Only Constant Fan
Hi-Med-Low
Motorized 2-way
or 3-way.
Normally closed.
E1 - Unit Mount
E2 - Wall Mount
E3 - Unit Tamperproof
4 Pipe - Valve Cycle
SYSTEM
THERMOSTAT
CONTROLS
CONTROL
VALVE TYPE
CHANGEOVER CONTROL
and LOCATION
THERMOSTAT
ORDER OPTION
Heat-Off-Cool
Constant Fan
Hi-Med-Low
Motorized 2-way
or 3-way.
Normally closed.
Manual
Hot - Cool Switch
on Thermostat
M1 - Unit Mount
M2 - Wall Mount
M3 - Unit Tamperproof
Heating and
Cooling
On-Off
Constant Fan
Hi-Med-Low
Motorized 2-way or
3-way. Normally
closed.
Automatic
N1 - Unit Mount
N2 - Wall Mount
N3 - Unit Tamperproof
4 deg. Neutral Dead Band
for sequenced heating &
cooling, DPDT
3-SPEED FAN SWITCH ONLY (no thermostat)
L1 - Unit Mount
L2 - Wall Mount
L3 - Unit Tamperproof
NOTE: 1. B1 option includes factory installed aquastat
Catalog No. VCBG1106 (Replaces VCBG803)
-8-
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