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English (US)
8.10 Minimum continuous duty flow rates [gpm]
* Grundfos Cool-Top
®
is only available in the following pump types:
8.11 Check valves
A check valve may be required on the outlet side of the pump to
prevent the pump inlet pressure from being exceeded.
When a pump with no check valve is stopped because there is no
demand on the system (all valves are closed), the high system
pressure on the outlet side of the pump will "find" its way back to
the inlet of the pump.
This is especially critical for CRN-SF applications because of the
very high outlet pressures involved. As a result, most CRN-SF
installations require a check valve on the outlet piping.
Pump type
min. °F to 176 °F
(min. °C to 80 °C)
at 210 °F
(at 99 °C)
at 248 °F
(at 120 °C)
at 356 °F
(at 180 °C)
CR, CRI, CRN 1s 0.5 0.7 1.2 1.2*
CR, CRI, CRN 1 0.9 1.3 2.3 2.3*
CR, CRI, CRN 3 1.6 2.4 4.0 4.0*
CR, CRI, CRN 5 3.0 4.5 7.5 7.5*
CR, CRI, CRN 10 5.5 8.3 14 14*
CR, CRI, CRN 15 9.5 14 24 24*
CR, CRI, CRN 20 11 17 28 28*
CR, CRN 32 14 21 35 35*
CR, CRN 45 22 33 55 55*
CR, CRN 64 34 51 85 85*
CRT 2 1.3 2.0 3.3 N/A
CRT 4 3.0 4.5 7.5 N/A
CRT 8 4.0 6.0 10 N/A
CRT 16 8.0 12 20 N/A
Pump type CR 1s CR 1 CR 3 CR 5 CR 10 CR 15 CR 20 CR 32 CR 45 CR 64
Standard (CR)
●●●
I version (CRI)
●●●●●●●
N version (CRN)
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