Hayward H400FDN Universal H Series Troubleshooting Guide - Page 61

Heat Exchanger: Flow Requirements

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Heat Exchanger: Flow Requirements Flow requirements should be checked to insure proper operation. Never allow heater to operate below minimum flow requirements or damage may occur. • Flow less than minimum could cause issues such as the heater dry firing or water to boil causing high limits to trip and possible damage to heat exchanger. • Flow exceeding maximum flow could cause issues such as damage to the heat exchanger by thinning the tube walls. Internal By-Pass Flow Requirements NOTE: Internal by-pass should be inspected periodically as it could be the cause of low or high water flow through the exchanger Model Min GPM H150FD H200FD 20 H250FD H300FD 25 H350FD H400FD 30 H400FD 40 Maximum water flow 125 GPM 61

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Internal By-Pass
Model
Min GPM
H150FD
H200FD
20
H250FD
H300FD
25
H350FD
H400FD
30
H400FD
40
Maximum water flow 125 GPM
Flow requirements should be checked to insure proper operation.
Never allow heater to operate below minimum flow requirements or damage may
occur.
•
Flow less than minimum could cause issues such as the heater dry firing or water to boil
causing high limits to trip and possible damage to heat exchanger.
•
Flow exceeding maximum flow could cause
issues such as damage to the heat
exchanger by
thinning the tube walls.
Flow Requirements
NOTE: Internal by-pass
should be inspected
periodically as it could
be the cause of low or
high water flow through
the exchanger
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Heat Exchanger: Flow Requirements