5. Refer to the circuit shown in Figure 27–2. Assume that the HOA switch is in the Hand position and that the motor is running. Now assume that OL2 opens its contacts. Would this stop the operation of the fan motor? Explain your answer. L1L2L3MOLHTRMOLHTRMOTORMOLHTRSTATSTOPHANDCONTROL TRANSFORMERHANDFigure 27-3 Push-button control station with hand-off-autoswitch and pilot light. (Source: Delmar/Cengage Learning.)OFFAUTOFigure 27-1 Hand-off-automatic switch provides manual controlof a motor or control can be provided by a float switch. (Source:Delmar/Cengage Learning.)double-throw switch with a common terminal, a nor-mally open terminal, and a normally closed terminalin this circuit. Notice that one terminal of both thenormally open switch and normally closed switch areCONTROL.TRANSFORMERHOA1-2 x 003-4 00xHOASTARTSTOPOL1FS1aloM1M2OL2TEMP 1M2Figure 27-2 A water-cooled motor must have a flow of water before it is permitted to run. (Source: Delmar/Cengage Learning.)

A Hand-off-automatic (HOA) controls are used to allow an operator to force a contact on, force it…

5. Refer to the circuit shown in Figure 27–2. Assume that the HOA switch is in the Hand position and that the motor is running. Now assume that OL2 opens its contacts. Would this stop the operation of the fan motor? Explain your answer.

5. Refer to the circuit shown in Figure 27–2. Assume that the HOA switch is in the Hand position and that the motor is running. Now assume that OL2 opens its contacts. Would this stop the operation of the fan motor? Explain your answer.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter15: Residential Air-conditioning Control Systems

Section: Chapter Questions

Problem 8RQ

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Question

L1
L2
L3
M
OLHTR
M
OLHTR
MOTOR
M
OLHTR
STAT
STOP
HAND
CONTROL TRANSFORMER
HAND
Figure 27-3 Push-button control station with hand-off-auto
switch and pilot light. (Source: Delmar/Cengage Learning.)
OFF
AUTO
Figure 27-1 Hand-off-automatic switch provides manual control
of a motor or control can be provided by a float switch. (Source:
Delmar/Cengage Learning.)
double-throw switch with a common terminal, a nor-
mally open terminal, and a normally closed terminal
in this circuit. Notice that one terminal of both the
normally open switch and normally closed switch are
CONTROL.
TRANSFORMER
HOA
1-2 x 00
3-4 00x
HOA
START
STOP
OL1
FS1
alo
M1
M2
OL2
TEMP 1
M2
Figure 27-2 A water-cooled motor must have a flow of water before it is permitted to run. (Source: Delmar/Cengage Learning.)

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