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4-1/16"
7 ¾"
2-1/2"
5"
Type 1 Enclosure
Figure 3a
PCB Latch
TImer Mechanism
Interior
Type 1 Enclosure
Protective Cover
Figure 4
PROGRAMMING SYNCHRONOUS AND QUARTZ MODELS
Follow the instructions in the sections below to program the DTAV40VM 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 DTAV40VMVM 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 DTAV40VM 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 DTAV40VM 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.
DTAV40VM 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 tempera-
ture 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 tempera-
ture 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 details.
Mode Selection
Paragon
Precision
TIME INITIATED, TIME TERMINATED
TIME INITIATED, REMOTE TEMPERATURE OR
PRESSURE TERMINATED
TIME INITIATED, PRESSURE TERMINATED
(Separate Pressure Switch Required (see instructions)
Grasslin
Cross Ref.
DTAV replaces over 40 models.
Wiring Diag.
"Green" LED ON
"1 & F" Make
"1 & 3" Break
"Red" LED ON
"1 & F" Break
"1 & 3" Make
Both LED's OFF
"1 & F" Make
"1 & 3" Break
Both LED's ON
"1 & F" Break
"1 & 3" Make
Note: It is necessary to apply power across terminals 1&N
in order to perform electrical test.
2
DTAV40VM TRIPPERS
A
M ODE
In Refrigeration Mode
Arrow on timer points to current time.
CONTROL
TERMINATE
POWER
INPUT
1
2
F
3
4
N
X
L1
L2/N
In Defrost Mode
Arrow on timer points to current time.
Trippers are "OUT"
CONTROL
TERMINATE
POWER
INPUT
3
1
2
4
N
F
X
L1
L2/N
DTAV40VM TRIPPERS
B
MODE
In Refrigeration Mode
Arrow on timer points to current time.
CONTROL
TERMINATE
POWER
INPUT
3
1
2
F
4
N
X
L1
L2/N
In Defrost Mode
Arrow on timer points to current time.
Trippers are "OUT"
CONTROL
TERMINATE
POWER
INPUT
3
1
2
F
4
N
X
L1
L2/N
Trippers are "IN"
Indicates
Refrigeration
"2 & 4" Make
Indicates
Defrost
"2 & 4" Break
Trippers are "IN"
Indicates
Refrigeration
"2 & 4" Break
Indicates
Defrost
"2 & 4" Make
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