Seresco CLASSIC NE Series, Operation And Maintenance Manual, Page: 20 / 33

E – Sequence of Operation
OMM.E.S.RS.00
E-
3
June
2018
Space Heating
When premise air temperature drops below the set point, the dehumidifier control system issues a call for Space
Heating Mode and engages space heater (electric heater, hot water coil with valve, gas boiler etc.) by sending space
heating signal, respective to space heater control type - on/off, variable (0-10VDC), etc.
Gas Boiler Package , one of the available space heating options, is a closed-loop water/glycol heating circuit, that
consists of a hot water coil, instantaneous gas boiler, pump and mixing 3-way valve. Boiler package piping general
schematic is shown on Pic. E.2 (depending on required capacity, boiler package could be single or double (as shown
on picture)):

The pump is engaged and maintains constant water flow whenever space heating call exists. The mixing
valve responds to the space heating call – the more heat is needed the hotter water is diverted towards the
space heating coil. Boiler is controlled and operated via its own control system, responding to proper gas
pressure, water flow, and will supply glycol at a constant temperature.
Pic. E.2