CFC-E Installation Manual
1-8 Part No. 750-459
2) High temperature glycol recommended.
3) The glycol concentration determines the maximum allowable firing rate and output of the boiler(s). Please refer to the
firing rate limitation and corresponding high fire speed settings vs. glycol% in the charts below.
4) Maximum allowable boiler outlet/supply temperature: 185° F (85° C).
5) Minimum water circulation through the boiler:
a) The minimum water circulation must be defined so that the temperature difference between the boiler outlet/
supply and inlet/return is a maximum of 40 deg F (22 deg C), defined as DT (Delta T). A DT Limit algorithm
should be enabled in the boiler controller.
b) Independent from the hydraulics of the heating system, constant water circulation through each boiler is
required while the boiler is operating (requires a dedicated boiler pump if in a primary/secondary loop
arrangement). Refer to table below for minimum boiler circulation rates.
5) Minimum over-pressure at the boiler: For outlet temperatures up to the maximum of 185 deg F (85 deg C), a minimum
operating pressure of 30 psig (2.1 bar) is required.
6) pH level must be maintained between 8.3 and 9.5
Table 1-4: Glycol Minimum Flow Recommendations for Model CFC-E Boiler
(Minimum required boiler circulation rate (gpm) at maximum firing rate.)
Notes/Limitations:
1. Maximum firing rate determined by CFC-E Glycol Firing Rate Limitation chart (below). Maximum high fire blower speed set
according to chart.
2. Based on ethylene glycol 25%. Minimum required system operating pressure is 30 psig.
3. Maximum system operating temperature of 185˚F. Maximum ΔT of 40˚.
4. Circulation rates correlate with boiler output based on 94% nominal efficiency.
5. Standard altitude (<1000' ASL). Contact Cleaver-Brooks for high altitude applications.
6. Pumps should be sized based on system design ΔT and minimum required flow rates.
7. At low fire, the minimum circulation rate should correspond to the boiler's turndown in order to maintain the design ΔT.
System ΔT (˚F)
Model-Size ΔT = 10˚ ΔT = 20˚ ΔT = 30˚ ΔT = 40˚
CFC-E 500 87442922
CFC-E 750 131 65 44 33
CFC-E 1000 174 87 58 44
CFC-E 1500 261 131 87 65
CFC-E 2000 348 174 116 87
CFC-E 2500 435 218 145 109
CFC-E 3000 522 261 174 131
CFC-E 3500 573 287 191 143
CFC-E 4000 655 328 218 164
CFC-E 5000 819 410 273 205
CFC-E 6000 983 491 328 246
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