Slant/Fin VHG-100-CH, Installation And Service Manual

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E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
37
VGH CH Boiler plumbing kit
VGH CO Boiler plumbing kit
Dimensions for both options
Figure 7.9 and 7.10 are equal.
Circulator functionality
Delta T monitoring:
A high temperature difference between supply and return of the boiler can indicate a clogged heat exchanger or
filter, or a defective circulator. The burner load automatically decreases when the Return/Supply temperature
differential increases too much.
A
t maximum burner power ΔT is limited to 72 °F and at low burner power a ΔT above 86
°F is not allowed. Above
these values the boiler modulates down until the temperature difference is between 72 °F and 86
°F. If the ΔT
exceeds 94 °F, the boiler will be temporarily switched off.
Figure 7.9 Figure 7.10
Figure 7.11