Bohn DTSX-IM-120 Installation Manual
S P E C I FI C AT I ON S
E lec tric al R atings :
E nvironmen tal R atings :
Ambient Temperature: -40F to 130F
Humidity: 0-95% non-condensing
Wiring C onnections :
Screw clamp terminals for #22AWG up to #8AWG wire.
Use #8 AWG wire with 90C rating for 40A loads.
Use #10 AWG wire with 90C rating for 30A loads.
E nclos ures :
Plastic NE MA 3R R aintight Indoor/Outdoor
Metal NEMA 1 Indoor
L ED Indic ation: G reen LE D when in refrigeration mode
Red L ED when in defrost mode
A P PL I CA T IO N
The DTS X Defros t Timer is identical in function, termina l identifi-
cation, and wiring to the Paragon 8140 a nd Prec ision 6140
series Defrost Timers. The DTSX ma y als o be us ed to replac e
Paragon 8040 and Precision 6040 series time terminated defros t
timers. With the addition of a remote pressure switch, the DTSX
can replac e the Paragon 8240 series and Prec ision 6240 s eries
pressure terminated defros t timers.
Defrosts will be initiated at the times set on the timer, which will
ac cept from 1 to over 24 defros t initiation s ettings per da y at 15
minute interva ls (8:00AM, 8:15AM, 8: 30AM, etc.) Defros t duration is settable in 15 minute interva ls from a minimum of 15 minutes up to s everal hours (15 minutes, 30 minutes , 45 minutes, 1
hour, 1 hour-15 minutes, etc.) The defrost duration determines
the termina tion time.
In standard configuration, the c ontac ts between terminals 1 and
3 are normally open and close during a defros t to energize
defrost heaters; the contacts between terminals 2 and 4 are normally c losed (when timer is energized) a nd open during a
defrost to de-energiz e refrigeration and fans .
DT S X T ime Initiated, R emote Temperature, P res s ure or
Time Terminated: Is us ed in electric or hot gas defrost applic ations where the defrost is terminated when the c oil is frost free,
as sens ed by a temperature or pressure switch, even though
the defros t progra mmed termination time has not been rea ched.
The time termination functions as a fail-sa fe and will terminate
the defros t if the temperature or pre ssure switc h fails to do so.
The temperature or pres sure switch on the refrigeration coil
have contacts which c lose on a temperature or pres s ure ris e to
above the freezing level, indic ating that frost and ic e have melted from the c oil. Typic ally a wide differential SPDT temperature
switc h is used, with it's normally c los ed contacts wired to the
fans , s o that the fans are delayed from turning on a fter defros t
termination, until the coil temperature has dropped ba c k to
below freezing. In most applic ations, the contac ts at terminals
2-4 a re normally c los ed (when timer is energized) and c ontrol
the fans a nd refrigera tion equipment or c ompres sor. For hot ga s
defrost, or for double pole switc hing, the 2-4 contacts may be
configured as normally open by moving jumper S 1 to the "B"
pos ition. Refer to wiring diagrams 1 thru 12.
ÒFÓ T erminal: The DTS X c ontains a normally c los ed contact
between terminals 1-F. This terminal may be used for switching
the fans off during a defros t rather than the 2-4 terminals . For
hot ga s defros t applications, with S1 in the "B" position, the fans
may be connec ted to the "F" terminal.
I NS T A L L AT I ON
Note: For outdoor locations, Raintight
, or wet loc ation conduit
hubs that c omply with requirements of U L 514B (standard for fittings for conduit and outlet boxes ) are to be used.
1. R emove 2 s crews retaining the interior cover panel and
remove panel by prying out with a thin blade (NE MA3R ).
2. S elec t knoc kouts to be used. R emove the inner (1/2") knock-
out by ins erting a s crewdriver in the s lot and c arefully punc h
knoc kout loose. R emove s lug. If the 3/4" knoc kout is
required, remove the outer ring with pliers after removing the
1/2" knoc kout. Smooth edges with knife if nec essary.
3. P lace enc losure in desired mounting location a nd mark the
three mounting holes.
4. Drill holes for #10 screws, start s crews in holes .
5. P lace enc losure over screws a nd tighten scre ws.
6. C onnec t conduit hubs to c onduit before connec ting the hubs
to the enc los ure. After ins erting hubs into enclosure, c arefully
tighten hub loc k nut. Do not over-torque.
7. If us ing NE MA 1 Metal E nc los ur e c onnec t grou nd wires
to grou nd lug on bottom of enclos ur e.
(Not applicable for NE MA3R plas tic enc los ure).
8. Wire in accordance with National and Local C odes .
9. R epla ce interior cover panel and 2 s crews (NE MA3R).
G ro unding: NE MA 3R enc los ure is of plastic construc tion
and does not require a ground connec tion or bonding.
N E M A 3 R e nc lo s ure doe s no t p r o v ide groundi n g be t w ee n
c on d u its . W he n u s in g n o n-m e ta ll i c c o nduit o r c a b le ,
c onne c t th e gro und w ir es of a ll c a ble s to ge the r w it h
a w ire n u t. W h e n m e ta l lic c o n d uit is u s e d , u s e
ground in g ty pe bu s hi n gs a nd a ju mpe r w ir e be tw e e n
e a c h c on du it.
C A U T IO N : Do not c he c k c irc uit s by Òs pa r k in g Ó w i r e s
to te rm in a ls . Da m age t o the d e fr os t tim e r m a y r es ult.
DT S X T im e I nitia t e d, T e m pe ra t ure , P r e s s ure o r
T im e Te r m in a te d 4 0 A De fr os t T im e rs
DTSX-IM-120
Defrost Timer Synchronous Drive: 40A
Blank: Plastic NEMA 3R
IM: Indoor Metal NEMA 1
M: Mechanism Only
P: Panel Mount w/standoff
B: Bracket Mount
120 VAC
240 VAC
[2] & [4] Contacts
30A Resistive
@120~240VAC
1HP @ 120VAC
2HP @ 240VAC
}
[1] & [3] Contacts
40A Resistive
@120~240VAC
1HP @ 120VAC
2HP @ 240VAC
}
[1] & [F] Contacts
30A Resistive
@120~240VAC
1HP @ 120VAC
2HP @ 240VAC
THE R MO S TAT
COM PR E S S OR
OR
SO LE NO ID VA LVE
OR
CON TAC TO R C OIL
DE FR O ST
HE ATE R
L1
L2
TIME R
TIME R
RE L EA S E
RE L AY
TE R MIN ATIO N
TH ER MO S TAT
W/FAN DE LAY
1
2
X
DT S X T ime/Temp. - E lectric D efrost W iring Dia gram
814 1 R eplac ement
S 1 P osition A with 814 1 La bel A pplied
7
8141
LAB E L
3
LIN E
FA N
N
4
L1
L2
TE R MIN ATION
TH ER MO S TAT
W/FA N D EL AY
2
4
X
N
DT S X T ime/Temp. - H ot G as Defros t Wiring D iagram
814 3 R eplac ement
S 1 P osition B with 81 43 L abel Applied
8
8143
LAB E L
TIME R
RE L EA S E
RE L AY
TIME R
LIN E
CO NN E C T AC R O S S
CO MP RE S S OR
TH ER MO S TAT
FA N
HOT
GA S
VA LV E
1
NO TE : R emove Bridge Betwee n 3-4
*S ee N ote 1
3
L1
L2
TE R MIN ATION
TH ER MO S TAT
2
X
DT S X T ime/Temp. - E lec tric Defros t Wiring D iagram
814 3 R eplac ement - Double P ole Switching
S 1 P osition B with 81 43 L abel Applied
9
8143
LAB E L
TIME R
RE L EA S E
RE L AY
TIME R
NO TE : R emove Bridge Betwee n 3-4
NO TE : Conne ct B ridge B etween 2 -X
3
DE FR O ST
HE ATE R
LIN E
SO LE NO ID
VA LV E
OR
CO NTAC TO R
1
4
N
P R O GR A M M IN G (S ync hronous and Qua rtz
E lec tromechanical Models )
S etting the Time:
Turn the minute hand c lockwise until the time of day (and AM
or PM) on the outer dial is aligned with the triangle marker on
the inner dial.
S etting Defrost Initiation T ime:
Move a white tab (tripper) on the outer dial outward a t eac h
desired initiation time. For exa mple, to s et defrost initiation
times at 6: 00AM, 11:30AM, 4: 30PM a nd 11:00P M, move the
tab adjacent to the "M" in AM on the dial (6:00AM), the tab
that lies between 11:30AM a nd 11:45 AM, the tab between
4:30PM and 4:45PM, and the tab a djacent to the
11:00-11:15P M marks . (See note for 8243/6243 replac ement.)
DO N O T R O T AT E M IN U T E H A N D C OU N T E R -C L O C K W IS E
S etting Maximum Defros t Duration:
Different defrost durations may be s et for each defros t initiation
setting. Each white tab (tripper) provides a 15 minute interva l.
The tabs that set the initiation time provide a minimum of 15
minutes of defrost. F or longer defros t duration, move additional
tabs (following in time) from the initiation tab. For example, if a
45 minute defrost is to s tart at 7:00AM,
move the tab outward that lies between
7:00 and 7:15 on the AM side of the dial,
and the tabs a djacent to 7:15-7:30 and
7:30-7:45. (3 tabs moved outward). The
defrost will initiate at 7:00AM a nd time terminate at 7:45AM (if temperature termination does not occur firs t.)
For electronic models , refer to separate progr amming
ins truc tions .
M
IMP OR TA NT INFOR MATION: T he Normally C los ed c ontacts between term inals 2 and 4 a re only c los ed wh en the defros t
timer is energized . T he 2-4 c ontacts a re the Normally O pen c ontacts of rela y K 2. (Normal Open relay conta c ts a re more
relia ble than Normally Closed). When chec k ing c ontinuity o f the c ontro l with no voltage applied, the 2-4 c ontacts will
appear as o pen ; th is is normal. T he 1-3 c onta cts will appear as open and the 1-F contac ts will a ppears as c los ed. We
recommen d that the c ontrol be te sted by u sing a v oltmeter, with rated voltage a pplied.
Note: A definite purpose contac tor must be us ed to switch loads grea ter than the following maximum loads:
Max. Fan & C ompressor L oad: 120V: 1HP
208/240V: 2HP
Max. Fan Load on Terminal "F" 120V: 1HP
208/240V: 2HP
T Y P I C A L W I R I N G DI A G R A MS
All switc h pos itions a re s hown in refrigeration cyc le operation, and change position upon initiation of a defros t.
COM PR E S S OR
OR
SO LE NO ID VA LV E
OR
CON TAC TO R CO IL
FA N
MOT OR
DE FR O ST
HE ATE R
L1
L2
TIME R
TIME R
RE L EA S E
RE L AY
F
3
1-N
2
4 X
LIN E
DT S X T ime/Time - E lec tric Defros t Wiring D iagram
804 5 R eplac ement
S 1 P osition A with 804 5 La bel A pplied
1
THE R MO S TAT
8045
LAB E L
THE R MO S TAT
COM PR E S S OR
OR
SO LE NO ID VA LVE
OR
CON TAC TO R C OIL
DE FR O ST
HE ATE R
L1
L2
TIME R
TIME R
RE L EA S E
RE L AY
1
2
4 X
DT S X T ime/Time - E lec tric Defros t Wiring D iagram
804 1 R eplac ement
S 1 P osition A with 804 1 La bel A pplied
2
8041
LAB E L
3
LIN E
FA N
N
L1
L2
2
4
N
3
DT S X T ime/Time - H ot Ga s D efrost W iring Dia gram
804 3 R eplac ement
S 1 P osition B with 80 43 L abel Applied
3
8043
LAB E L
TIME R
RE L EA S E
RE L AY
TIME R
LIN E
CO NN E C T AC R O S S
CO MP RE S S OR
TH ER MO S TAT
HOT
GA S
VA LV E
F
NO TE : R emove Bridge Betwee n 1-4
1
L1
L2
2
2
DT S X T ime/Time - E lec tric Defros t Wiring D iagram
804 7 R eplac ement - Double P ole Switching
S 1 P osition B with 80 47 L abel Applied
4
8047
LAB E L
TIME R
RE L EA S E
RE L AY
TIME R
NO TE : Move Bridge to 2-2
NO TE :
3
DE FR O ST
HE ATE R
LIN E
SO LE NO ID
VA LV E
OR
CO NTAC TO R
N
4
1
COM PR E S S OR
OR
SO LE NO ID VA LV E
OR
CON TAC TO R CO IL
FA N
MOT OR
DE FR O ST
HE ATE R
L1
L2
TIME R
TIME R
RE L EA S E
RE L AY
TE R MIN ATION
TH ER MO S TAT
W/FA N D EL AY
F
3
1 2
4
X
N
LIN E
DT S X T ime/Temp. - E lectric Defros t Wiring Dia gram
814 5 R eplac ement
S 1 P osition A - N o La bel R equire d
5
THE R MO S TAT
THE R MO S TAT
COM PR E S S OR
OR
SO LE NOI D VA LVE
OR
CON TAC TO R C OIL
DE FR O ST
HE ATE R
L1
N
120V
TIME R
TIME R
RE L EA S E
RE L AY
TE R MIN ATIO N
TH ER MO S TAT
W/FA N D EL AY
1
2
4
X
DT S X T ime/Temp. - E lectric D efrost W iring Dia gram
120 V F an & D efrost H eater; 240 V C ompres sor
S 1 P osition A - N o La bel R equire d
6
3
N
F
FA N
120V
240V
L2
Max. Defros t Heater Load: 120V: 4800Watts
208V: 8320Watts
240V: 9600Watts
8
7
A
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