[TRNSYS-users] problem about type 121b auxiliary heating

[Jay Zhu]

Hey There:
I tried to use unitary air conditioner type 651 (for cooling) and type 121
auxiliary heating  (for heating) to connect with type 56 house controlled by
thermostat type 108 , i found a very curious result after testing these
types by adding and deleting them

First time, When i totally delete the type 121, make the system runs, the
simulation obvious will show the cooling only.
Second time, when i add the type 121 auxiliary heating, but i set heating
point of the thermostat  as low as 5 C, it means the heating will still not
running based on the Tampa, Fl weather condition.  So the result will shows
the cooling only also without heating.

it is supposed the plot for these two cases should be exactly same in my
opinion. However, cooling consumption of the second case with type 121(but i
set it not work at all ) is lower than the first case, and the plot for the
room temperature is also different.

Am i wrong somewhere ? i am so confused for this problem. Thank you in
advance

I changed my simulation to air source heat pump now, but i still wanna know
what the exactly problem is for the two simulation cases
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