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When checking the performance of a system in heating mode using the pressure curves, what should your approximate discharge pressure be if your indoor SCFM is 1250, your outdoor temperature is 20°F, and your indoor dry bulb is 70°F?

A. 250 to 270 psig
B. 270 to 290 psig
C. 280 to 300 psig
D. 260 to 280 psig

Answer :

We start with the following information:

1. The indoor airflow is given as
[tex]$$\text{Indoor SCFM} = 1250.$$[/tex]

2. The outdoor temperature is
[tex]$$\text{Outdoor Temperature} = 20^\circ F,$$[/tex]
and the indoor dry bulb temperature is
[tex]$$\text{Indoor Dry Bulb Temperature} = 70^\circ F.$$[/tex]

3. Compute the temperature difference:
[tex]$$\Delta T = 70^\circ F - 20^\circ F = 50^\circ F.$$[/tex]

4. In heating mode operation, the pressure curves for a system indicate that, with an indoor airflow of 1250 SCFM and a temperature difference of [tex]$50^\circ F$[/tex], the approximate discharge pressure should lie within the range of
[tex]$$260 \text{ psig} \text{ to } 280 \text{ psig}.$$[/tex]

Thus, the final answer is that the discharge pressure should be approximately between
[tex]$$260 \text{ psig} \quad \text{and} \quad 280 \text{ psig}.$$[/tex]

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