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Figure 11C
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Belimo LF24-SR-S Actuator
Figure 11D – X4M Firing Rate vs Manifold Pressure
The manifold pressures shown are the gas pressures taken at the 1” tee and represent a zero furnace
pressure (net manifold pressure). Therefore, the actual furnace pressure must be subtracted from these
pressures to obtain the correct firing rate. Example: While firing an X4M-400 the Manifold pressure is 3.0”
w.c. The furnace pressure from the manometer reads 0.5” w.c. Therefore, 3”- 0.5” = 2.5”w.c. The chart in
Figure 11D shows 2.5” w.c. net manifold pressure is equal to 400,000 BTUH.
18
Manifold Pressure vs. Firing Rate
0
0.5
1
1.5
2
2.5
3
3.5
4
0
100
200
300
400
500
600
700
800
Firing Rate (MBH)
M
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n
if
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ld
P
re
s
s
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w
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.
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X4M-400
X4M-700
Summary of Contents for X4-400
Page 1: ...X4 AND X4M INSTALLATION AND OPERATION MANUAL ...
Page 4: ......
Page 17: ...X4M 14 ...
Page 18: ...15 ...
Page 20: ...Figure 11A Typical Wiring Diagram For X4M Figure 11B General Arrangement Diagram for X4M 17 ...