[Equest-users] excessive underheating

[Dante Garcia]

Good Day eQuest-users,

I apologize if anyone can help me in the following use, there is a VAV with reheat system, DX cooling and Hot Water Reheat. The Hot Water reheat is supplied by a boiler. The building is one floor with perimeter and core zones.

The following issue cause excessive unmet load hours in heating, I figure out that changing Heat/Rehat: Hot Water delta F from 30 F to 20 F reduce unmet load hours but cooling capacity is increased tremendously, also the following warning is maintained.

Please, any of you have go ahead with the following warning?

**WARNING**********************************************************************
             ZONE EL1 WSW Zone (fG.z1)
             might have insufficient heating capability.
             Check that the SYSTEM or ZONE HEATING-CAPACITY plus this
             ZONEs BASEBOARD-RATING is adequate to maintain the ZONE
             specified DESIGN-HEAT-T for the calculated peak ZONE load
             (see LS-A or LS-B for the ZONE peak load.)

             SYSTEM S1 Sys (PVAVS)
             which supplies the above listed ZONE, has a design heating
             coil exit temperature, HEAT-SET-T,(plus any zone reheat)
             below its MAX-SUPPLY-T or the ZONE DESIGN-HEAT-T, which
             might account for the insufficient heating capability.

             ZONE EL1 WSW Zone (fG.z1)             has a THERMOSTAT-TYPE
             of REVERSE-ACTION, which, when added to the issues listed
             in the messages above, will cause excessive underheating.

Thank you!

SUMAC
Dante Garcia, LEED AP BD+C
Tel: +511.253.5355 Anexo 16 (Lima, Perú)
Cel: +51.989.685.769 (Lima, Perú)

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