LAARS HEATING SYSTEMS
Page 12
Heat Flow Pressure* Water Temp
Exch. Water Rate Drop Rise
Model Passes Category
gpm
L/s
ft.
m
°F °
C
175 2 Soft 22
1.4
5.8
1.8
13
7
Normal 34
2.1
11.2
3.4
8
4
Hard 46
2.9
19.1
5.8
6
3
4 Soft 11
0.7
4.9
1.5
25
14
Normal 17
1.1
9.3
2.8
16
9
Hard 23
1.5
15.9
4.8
12
7
250 2 Soft 22
1.4
5.8
1.8
18
10
Normal 34
2.1
11.2
3.4
12
7
Hard 46
2.9
19.1
5.8
9
5
4 Soft 11
0.7
4.9
1.5
35
19
Normal 17
1.1
9.3
2.8
33
18
Hard 23
1.5
15.9
4.8
17
9
325 2 Soft 34
2.1
12.5
3.8
18
10
Normal 34
2.1
12.5
3.8
18
10
Hard 46
2.9
21.7
6.6
11
6
4 Soft 17
0.7
10.4
3.2
36
20
Normal 17
0.7
10.4
3.2
30
17
Hard 23
1.5
18.1
5.5
22
12
400 2 Soft 34
2.1
13.3
4.1
19
11
Normal 34
2.1
13.3
4.1
19
11
Hard 46
2.9
23.4
7.1
14
8
4 Soft 17
0.7
11.1
3.4
37
21
Normal 17
0.7
11.1
3.4
37
21
Hard 23
1.5
19.5
5.9
27
15
*Pressure drop includes head loss of heat exchanger and through 30 feet (9.1 m) of pipe and normal fittings when
heater is installed with storage tank. Pipe and fittings are assumed to be 1-1/2 inch (38 mm).
Remote Temperature
Control for Heater
Main Circulating Loop
(With Own Pump)
Water Maintained
Less Than 110°F (43°C)
To
Drain
Heater
Adjustment Procedure
1. Turn on heater and open gate
valves A and B.
2. After 15 minutes, read T1.
3. If T1 is less than 110°F (43°C),
slowly close valve B until T1
climbs to 110°F (43°C).
4. If T1
is greater than 110°F (43°C),
slowly close valve A until T1
drops to 110°F (43°C).
5. Check after 5 minutes
operation and make final
adjustments.
Figure 20. Cold water application.
Table 4. Pump Performance Requirements.
To Next Page
Loading...
