Page No 32 Reznor, Guardian GB GR and GS, Installation Manual, EN 2021-08, D301214 Iss D
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Function narrative of the unit:
LPHW flow and return temperature when “outside limit” is set
When ‘Outside Limit’ is set for an LPHW control the installer can set the outside limit temperature
and the full flow/return at temperature.
When the outside temperature is above the outside limit the fan will continue to run but the heat
valve output will be off.
When the outside temperature is below the full flow/return at temperature the target flow and
return temperatures set for the air curtain are used.
When the outside temperature is in between these two points the target flow and return
temperatures are scaled between the two points as shown in the graph below.
In this example the outside limit temperature has been set to 22°C, the full flow/return at
temperature has been set to 12°C and the characteristic flow and return temperature has been set
to 82/71°C.
