Section 2 — Installation
Part No. 750-263 2-13
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 should be maintained between 8.3 and 9.5
Glycol Application Guidelines — ClearFire Model CFC
Minimum required boiler circulation rate (gpm) at maximum firing rate.
ClearFire System ΔT (˚F)
Model-Size
ΔT = 10˚ ΔT = 20˚ ΔT = 30˚ ΔT = 40˚
CFC-500 88 44 29 22
CFC-750 131 66 44 33
CFC-1000 175 88 58 44
CFC-1500 263 131 88 66
CFC-1800 316 158 105 79
CFC-2500 438 219 146 110
Notes/Limitations:
1. Maximum firing rate determined by ClearFire CFC - Glycol Firing Rate Limitation chart (below).
Maximum high fire blower speed should be set according to chart.
2. Glycol concentration limit of 25%-50%. Minimum required system operating pressure is 30
psig.
3. Maximum system operating temperature of 180 ˚F. Maximum ΔT of 40˚.
4. Circulation rates correlate with boiler output based on 92% nominal efficiency.
5. Standard altitude (<1000' ASL). Contact C-B for high altitude applications.
6. Pumps should be sized based on system design ΔT and minimum required flow rates.
7. At minimum firing rate, the minimum circulation rate should correspond to the boiler's turndown.
To Next Page
Loading...
Need help?
General
