Copyright Goodheart-Willcox Co., Inc. 220
Apply and Analyze
________1. Referring to the wiring diagram below, which of the following best describes
the contacts CC1 and CC2?
C Compressor common
CC Contactor coil
CC1, 2 Contactor contacts
CFM Condenser fan motor
COMP Compressor
HPS High pressure switch
LPS Low pressure switch
R Compressor run
RC Run capacitor
S Compressor start
Line voltage
Low voltage
Legend and Abbreviations
Low-voltage
Power supply
40 VA/24 V
Power supply
208/230 V
Single-phase, 60 Hz
BK
RED
BR BR
W
W
BK
YEL
BK
BK
BK
BK
RC RC
C
R
S
YEL
BL
BL ORG
ORG
COMP
CFM
LPS
CC
CC1
CC2
HPS
Goodheart-Willcox Publisher
A. CC1 and CC2 are both normally closed sets of contacts.
B. CC1 and CC2 are both normally open sets of contacts.
C. CC1 is a normally closed set of contacts, and CC2 is a normally open set of
contacts.
D. CC1 is a normally open set of contacts, and CC2 is a normally closed set of
contacts.
________2. The IFR in in the following fi gure is best described as what type of switching
device?
L1 N
HIGH
LOW
RC
IFR
Indoor fan motor Fan switch
R G
Space
thermostat
24 V
X-FRMR
Goodheart-Willcox Publisher
A. Single-pole single-throw
B. Single-pole double-throw
C. Double-pole single-throw
D. Double-pole double-throw