First Operations Air Conditioner 300 1200 CFM User Manual

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)  
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