8141 Replacement
Mode A with 8141 Terminal Block Label Applied
7
L1
L2
TERMINATION
THERMOSTAT
W/FAN DELAY
2
4
X
N
8143 Replacement
Mode B with 8143 Terminal Block Label Applied
8
8143
LABEL
LINE
CONNECT ACROSS
COMPRESSOR
THERMOSTAT
FAN
HOT
GAS
VALVE
1
3
L1
L2
TERMINATION
THERMOSTAT
2
X
8143 Replacement–Double Pole Switching
Mode B with 8143 Terminal Block Label Applied
9
8143
LABEL
3
DEFROST
HEATER
LINE
SOLENOID
VALVE
OR
CONTACTOR
1
4
N
DTAV40 - TYPICAL WIRING DIAGRAMS
All switch positions are shown in refrigeration cycle operation, and change position upon initiation of a defrost.
1
THERMOSTAT
COMPRESSOR
OR
SOLENOID VALVE
OR
CONTACTOR COIL
DEFROST
HEATER
L1
L2
1
2
4
X
8041 Replacement
Mode A with 8041 Terminal Block Label Applied
2
8041
LABEL
3
LINE
FAN
N
3
L1
L2
2
2
8047 Replacement–Double Pole Switching
Mode B with 8047 Terminal Block Label Applied
4
8047
LABEL
3
DEFROST
HEATER
LINE
SOLENOID
VALVE
OR
CONTACTOR
N
4
1
8245 Replacement
Mode A with 8245 Terminal Block Label Applied
10
THERMOSTAT
COMPRESSOR
OR
SOLENOID VALVE
OR
CONTACTOR COIL
DEFROST
HEATER
L1
L2
TERMINATION
THERMOSTAT
W/FAN DELAY
1
2
X
8141
LABEL
3
LINE
FAN
N
4
COMPRESSOR
OR
SOLENOID VALVE
OR
CONTACTOR COIL
FAN
MOTOR
DEFROST
HEATER
L1
L2
PRESSURE
SWITCH
F
3
1-N
2
4
LINE
THERMOSTAT
Xp
p
LABEL
8245
COMPRESSOR
OR
SOLENOID VALVE
OR
CONTACTOR COIL
FAN
MOTOR
DEFROST
HEATER
L1
L2
TERMINATION
THERMOSTAT
W/FAN DELAY
F
3
1
2
4
X
N
LINE
8145 Replacement
Mode A - No Label Required
5
THERMOSTAT
DEFAULT (Out of the Box)
CONTROL
POWER
TERMINATE
INPUT
CONTROL
POWER
TERMINATE
INPUT
CONTROL
POWER
TERMINATE
INPUT
CONTROL
POWER
TERMINATE
INPUT
CONTROL
POWER
TERMINATE
INPUT
CONTROL
POWER
TERMINATE
INPUT
CONTROL
POWER
TERMINATE
INPUT
L1
L2
4
8247 Replacement–Double Pole Switching
Mode B with 8247 Terminal Block Label Applied
8247
LABEL
3
DEFROST
HEATER
LINE
SOLENOID
VALVE
OR
CONTACTOR
N
2
1
p
PRESSURE
SWITCH
Xp
8045 Replacement
Mode A with 8045 Terminal Block Label Applied
COMPRESSOR
OR
SOLENOID VALVE
OR
CONTACTOR COIL
FAN
MOTOR
DEFROST
HEATER
L1
L2
F
3
1-N
2
4
X
LINE
THERMOSTAT
8045
LABEL
CONTROL
POWER
TERMINATE
INPUT
THERMOSTAT
COMPRESSOR
OR
SOLENOID VALVE
OR
CONTACTOR COIL
DEFROST
HEATER
L1
N
TERMINATION
THERMOSTAT
W/FAN
1
2
4
X
120V Fan & Defrost Heater; 240V Compressor
Mode A - No Label Required
6
3
N
F
FAN
120V
240V
L2
DELAY
CONTROL
POWER
TERMINATE
INPUT
REPLACING EXISTING DEFROST TIMERS
The DTAV40 will replace all models of Paragon 8040, 8140,8240 Series or Precision 6040, 6140 Series and all prior Grasslin Defrost Timer models.
TERMINAL IDENTIFICATION:
The standard DTAV40 terminal identification is identical to the Paragon 8145 with the addition of the “F” terminal. Terminal identification labels are provided for the other models to be
placed over the printed numbers on the printed circuit board. From the table above, select the proper label, apply to printed circuit board and wire per the original wiring or the wiring
diagrams indicated.
“F” TERMINAL:
The DTAV40 contains a normally closed contact between terminals 1 and F. This terminal may be used to switch the fans off during a defrost rather than terminals 2 and 4. For hot gas
defrost applications, with the mode switch set to position “B”, the fans may be connected to terminal “F”.
8143 Replacement:
When replacing a Paragon 8143, wire the termination thermostat to terminal X of the DTAV40 (with the 8143 label attached), and the adjacent blank terminal. The
Paragon timers are wired to terminal X and the blank terminal. If the termination thermostat is wired to terminal N of the DTAV40 temperature termination will not occur and may result
in burnout of the DTAV40. See wiring diagrams 8 & 9.
8240 SERIES REPLACEMENT:
The DTAV40 may be used to replace the Paragon 8240 series defrost timers with integral pressure termination by the addition of a remote pressure
switch wired to terminals Xp and p of the DTAV40 (with an 8240 series terminal label applied). There must be no external voltage connected to the pressure switch. Set pressure
switch cut-in to the same value as set on the Paragon defrost timer being replaced. Set cut-out 6 to 14 psi below cut-in. See wiring diagrams 10 and 3.
N
1
N
1
3
X
4
2
2
F
3
1
2
4 N X
F
3 1-N 2
4 Xp
p
N
1
3
2
4 Xp
p
N
1
3
2
4
X
1 N
3
4
2
X
F
3 1-N 2
4
X
2
4
3
4
5
2
4
1, 6
7
8, 9
See Note 1
10
3
APPLICATION
The DTAV40 Defrost Timer is equivalent in function, ter-
minal identification (with appropriate terminal block label
attached), and wiring to the Paragon 8140 and Precision
6140 series Defrost Timers. (See Note 1) 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 (8:00AM, 8:15AM, 8:30AM, etc)
Defrost
duration
is settable in 15 minute intervals from a
minimum of 15 minutes up to several hours (15 minutes,
etc.) 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 be-
tween 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 tempera-
ture or pressure switch fails to do so. The temperature
or pressure switch on the refrigeration coil has con-
tacts which close on a temperature or pressure rise
above freezing, indicating that frost and ice have melt-
ed 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 con-
tacts at terminals 2 and 4 are normally closed with
S1 in “A” position and control the fans and refrigera-
tion 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.
“F” Terminal:
The DTAV40 contains a normally closed contact
between terminals 1 and F. This terminal may be used
to switch the fans off during a defrost rather than ter-
minals 2 and 4. For hot gas defrost applications, with
the mode switch set to position “B”, the fans may be
connected to ter
REPLACING EXISTING DEFROST TIMERS
The DTAV40 will replace all models of Paragon 8040,
8140, 8240 Series or Precision 6040,6140 Series and
all prior Grasslin Defrost Timer models.
TERMINAL IDENTIFICATION:
The standard DTAV40 terminal identification is identical
to the Paragon 8145 with the addition of the “F” terminal.
Terminal identification labels are provided for the other
models to be placed over the printed numbers on the
printed circuit board. From the table above, select the
proper label, apply to printed circuit board, and wire per
the original wiring or the wiring diagrams indicated.
minal “F.”
Note:
The DTAV40 is configured by default (out of the
box) to replicate the 8145 wiring. For replacement of
other models refer to page 3.
WIRING LEGENDS
Terminal
Typical
Paragon
Precision
GRASSLIN
S1 Mode
Ident.
Wiring
Terminal Layout
Model
Model
Model
Selector
Label
Diagram
TIME INITIATED, TIME TERMINATED
8045
6045
DTAV40
A
8045
8041
6041
DTAV40
A
8041
8047
6047
DTAV40
B
8047
TIME INITIATED, REMOTE TEMPERATURE OR PRESSURE TERMINATED
8145
6145
DTAV40
A
None
8141
6141
DTAV40
A
8141
TIME INITIATED, PRESSURE TERMINATED
(Separate Pressure Switch Required - see instructions)
8143 --- DTAV40 B 8143
8245 --- DTAV40 A 8245
8247 --- DTAV40 B 8247
