2
AP21 Programming Manual
13
n/u
n/u
14
n/u
n/u
15
n/u
n/u
16
n/u
n/u
PoWEr Fail BaCKuP
Program and time keeping is maintained for 48 hours on a rechargeable capacitive backup system in the event of a power
failure. The output and display are disabled during backup. The AP21 resumes normal operation when power is restored.
aCCuraCY
TimE KEEPing
— Synchronous with the AC power line and 4 PPM on DC power. During a power failure it is quartz crystal
controlled with an accuracy of +/-.005% throughout its full temperature range.
ProgrammED EVEnTS
— On/Off events are programmable with a one minute resolution and occur at the zero second
of that minute.
Wiring
WARNING: Disconnect power before wiring connection. Observe all safety precautions.
aP21
TErminal BloCK
AC–
AC+
GND
+12V
–12V
N/O
N/C
COM
Relay
Moveable
(IN)
Relay
N/O
(OUT)
Pin #
WirE Color
TXDoT
Wiring aP2T/CPr
FunCTion
1
Black
120 VaC
2
White
aC - (neutral)
3
green
Chassis ground
4
red
relay n/o
5
Yellow
relay n/o
6
n/u
n/u
7
n/u
n/u
8
n/u
n/u
9
n/u
n/u
10
White/Yellow
relay Common
11
White/red
12V DC+
12
White/Black
12V DC Common
13
Black/red
12V DC–
14
n/u
n/u
15
red
12V DC+
16
n/u
n/u
Pin #
WirE Color
STanDarD
Wiring aP2T/CPr
FunCTion
1
Black/White
120 VaC
2
White
aC - (neutral)
3
green
Chassis ground
4
Yellow/Black
relay Common
5
Yellow
relay n/o
6
n/u
n/u
7
n/u
n/u
8
n/u
n/u
9
n/u
n/u
10
Yellow/White
relay n/o
11
n/u
n/u
12
n/u
n/u
aP21Tr oCTal BaSE mounT Pin ouT
(discontinued product, unavailable for a new installation)
To install the AP21TR requires an eight-pin octal base such as a Potter and Brumfield #27E122 or equivalent. Mount this
base in a suitable location and wire the terminals of the base as follows:
aC VErSion
DC VErSion
1. Relay Common
1. Relay Common
2.
Line
2.
3. Relay normally open
3. Relay normally open
4. Relay normally closed
4. Relay normally closed
5.
5.
6.
6. –12VDC
7. Neutral
7.
8.
8. +12VDC
