I.C.E. HTDM Food Process Unit - Manual (Page 18)

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operation for a period of time to allow for cooling of the heat
exchanger.
5) Fan on in Standby Mode
With this option the main supply fan will remain in operation
regardless of the call for heat when the Standby option is
selected. During transition between heat and standby operation
the supply fan may cycle on and off for a short duration.