CB FALCON
47
750-265
Thus there are 5 steps in the modulation limiting:
step 0: unlimited (max is 100%)
step 1: max is 80% of range
step 2: max is 60% of range
step 3: max is 40% of range
step 4: max is 20% of range
step 5: limited to minimum modulation rate
If the monitored temperature is not within 12°F of the limit, then
no rate limiting occurs. The stepped rate limit behaves as
illustrated below:
Assuming that rate limiting has not been in effect, when the
monitored temperature crosses a threshold that is 10°F away
from the limit, then the maximum allowed firing rate is reduced
by one stepsize (to 80%) and thereafter it is reduced by one
stepsize every two °F until it is reduced to the minimum
modulation rate when the 2°F threshold is crossed. Assuming
that rate limiting has been in-effect then the thresholds for
returning to a less restrictive step are shifted by 2°F to provide
hysteresis. I.e. to go from step 4 to step 5 the threshold occurs
at 2°F, but to go the other way, from step 5 to step 4, the
threshold is 4°F.
Fig. 19. Stepped modulation rate limiting.
STEPPED MODULATION RATE LIMITING
DEGREES F FROM THRESHOLD
AT THIS POINT A RESPONSE OCCURS DUE TO REACHING A
SAFETY LIMIT.
...>12 12
10
6
4
2
0
4
5
2
3
1
0
8
LIMITED MODULA
TION STEP
MAXIMUM
MODULATION
RATE (NO LIMIT)
MINIMUM
MODULATION
RATE
Содержание CFC-1000
Страница 1: ...Manual Part No 750 263 07 2010 Model CFC ClearFire Condensing Boiler Operation Service and Parts ...
Страница 35: ...Section 2 Installation Part No 750 263 2 21 Figure 2 23 Gas Piping ...
Страница 47: ...Section 2 Installation Part No 750 263 2 33 Figure 2 41 Electrical Connection Diagram ...
Страница 49: ...Section 2 Installation Part No 750 263 2 35 Figure 2 43 CFC Wiring Diagram dual fuel units ...
Страница 50: ...Section 2 Installation 2 36 Part No 750 263 ...
Страница 70: ...Section 3 Stack and Intake Vent Sizing and Installation 3 20 Part No 750 263 ...
Страница 102: ...Section 4 CFC Commissioning 4 32 Part No 750 263 ...
Страница 108: ...Section 5 Service and Maintenance 5 6 Part No 750 263 ...
Страница 110: ...Section 6 Parts 6 2 Part No 750 263 Figure 6 1 Boiler Mechanical Assembly I 26 15 20 20 3 10 11 G H ...
Страница 113: ...Section 6 Parts Part No 750 263 6 5 Figure 6 3 Casing Table 6 5 Casing parts ...
Страница 114: ...Section 6 Parts 6 6 Part No 750 263 Figure 6 4 Gas train single fuel Table 6 6 Gas train single fuel parts BOILER SIZE ...
Страница 117: ...Section 6 Parts Part No 750 263 6 9 Figure 6 7 Electrical assemblies single fuel ...
Страница 123: ...APPENDIX A CB FALCON CONTROLLER ...
Страница 124: ......
Страница 244: ...CB FALCON 750 265 120 ...
Страница 245: ...APPENDIX B CB FALCON PLUG IN MODULE ...
Страница 246: ......
Страница 250: ......
Страница 251: ...APPENDIX C GAS VALVE ...
Страница 252: ......
Страница 261: ...V4730C V8730C V4734C 1 1 Gas Air Servo Regulated Gas Valves EN2R 9074 0612R1 NE 9 Fig 8 V4734 VMU 500 680 ...
Страница 269: ...APPENDIX D CB FALCON MODBUS COMMUNICATION ...
Страница 270: ......