The steam heated preheater and its associated pneumatic control valve are controlled by what device in the class "A" air conditioning system shown in the illustration as used condition the air of large public spaces? See illustration GS-RA-09.
A
room thermostat
B
duct thermostat
C
diverting relay
D
humidistat
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Question 1 / 205eccef9dbacbc34ba4d45ecb
Question 1 of 205eccef9dbacbc34ba4d45ecb
The steam heated preheater and its associated pneumatic control valve are controlled by what device in the class "A" air conditioning system shown in the illustration as used condition the air of large public spaces? See illustration GS-RA-09.
The steam heated preheater and its associated pneumatic control valve are controlled by what device in the class "A" air conditioning system shown in the illustration as used condition the air of large public spaces? See illustration GS-RA-09.