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PROGRAMMING SYNCHRONOUS AND QUARTZ
MODELS
Follow the instructions in the sections below to program the
DTAV40 Timer.
Setting the Time of Day:
Rotate the timer dial clockwise to align the triangle on the
inner dial with the desired time. The triangle represents the
current time on the timer.
NOTE: The AM and PM locations on the wheel represent 6
AM and 6 PM. For example, if the triangle points to the 7
after PM, then the current time is 7 PM. If the triangle
points to the 5 before PM, then the current time is 5 AM.
DO NOT ROTATE MINUTE HAND COUNTER-CLOCKWISE
Setting Defrost Times:
Follow this procedure to configure defrost times.
1. On the timer wheel, choose a defrost starting time.
2. Slide the tripper upward that is directly above the desired
time. The timer will initiate a 15 minute defrost at the
configured time.
3. To increase the duration of the defrost,
slide up the trippers that are adjacent to the
starting time.
NOTE: Each tripper on the time wheel
represents 15 minutes. For example, to set a 45-minute
defrost, slide the two trippers adjacent to the starting time.
NOTE: The AM and PM locations on the wheel represent 6
AM and 6 PM.
4. Repeat steps 1 through 3 as necessary to configure
multiple defrost times for a given day.
APPLICATION
The DTAV40 Defrost Timer is equivalent in function, terminal identification
(with appropriate terminal block label attached), and wiring to the Paragon
8140 and Precision 6140 series Defrost Timers. The DTAV40 may also be
used to replace Paragon 8040 and Precision 6040 series time terminated
defrost timers. With the addition of a remote pressure switch, the DTAV40 can
replace the Paragon 8240 series pressure terminated defrost timers.
Defrosts will be initiated by programming the timer, which will accept from 1
to over 24 defrost initiation settings per day at 15 minute intervals (8:00 AM,
8:15 AM, 8:30 AM, etc)
Defrost duration is settable in 15 minute intervals from a minimum of 15
minutes up to several hours. The defrost duration determines the termination
time. In standard configuration, the contacts between terminals 1 and 3 are
normally open and closed during a defrost to energize defrost heaters; the
contacts between terminals 2 and 4 are normally closed with S1 in "A"
position and open during a defrost to de-energize refrigeration and fans.
DTAV40 Time Initiated, Remote Temperature,
Pressure or Time Terminated:
Used in electric or hot gas defrost applications where the defrost is
terminated when the coil is frost free, as sensed by a temperature or
pressure switch, even though the defrost programmed termination time
has not been reached. The time termination functions as a fail-safe and will
terminate the defrost if the temperature or pressure switch fails to do so. The
temperature or pressure switch on the refrigeration coil has contacts which
close on a temperature or pressure rise above freezing, indicating
that frost and ice have melted from the coil. Typically a wide differential
SPDT temperature switch is used with it's normally closed contacts wired to
the fans thereby delaying the fans from coming on until the coil temperature
has dropped back to below freezing. In most applications, the contacts at
terminals 2 and 4 are normally closed with S1 in "A" position and control the
fans and refrigeration equipment or compressor. For hot gas defrost, or for
double pole switching, contacts 2 and 4 may be configured as normally open
by selecting mode "B". Refer to wiring diagrams 1 thru 10 for
additional detail.
DTAV40 TRIPPERS
DTAV40 TROUBLESHOOTING GUIDE
In Refrigeration Mode
Arrow on timer points to current time.
"Green" LED ON
"1 & F" Make
"1 & 3" Break
F
3
In Defrost Mode
Arrow on timer points to current time.
"Red" LED ON
"1 & F" Break
"1 & 3" Make
3
F
DTAV40 TRIPPERS
DTAV40 TROUBLESHOOTING GUIDE
In Refrigeration Mode
Arrow on timer points to current time.
Both LED's OFF
"1 & F" Make
"1 & 3" Break
3
F
In Defrost Mode
Arrow on timer points to current time.
Both LED's ON
"1 & F" Break
"1 & 3" Make
3
F
Note: It is necessary to apply power across terminals 1&N
in order to perform electrical test.
2
A
A
MODE
M ODE
Trippers are "IN"
Indicates
Refrigeration
CONTROL
TERMINATE
POWER
INPUT
"2 & 4" Make
1
2
4
N
X
L1
L2/N
Trippers are "OUT"
Indicates
CONTROL
TERMINATE
POWER
INPUT
"2 & 4" Break
1
2
4
N
X
L1
L2/N
B
B
MODE
MODE
Trippers are "IN"
Refrigeration
CONTROL
TERMINATE
POWER
INPUT
"2 & 4" Break
1
2
4
N
X
L1
L2/N
Trippers are "OUT"
CONTROL
TERMINATE
POWER
INPUT
"2 & 4" Make
1
2
4
N
X
L1
L2/N
Defrost
Indicates
Indicates
Defrost
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