Grasslin DTMV40 Series, DTMV40, DTQMV40, DTMV40-IM, DTMV40-M Operating Instructions Manual

• Disconnectpoweratthecircuitbreaker(s)ordisconnectswitch(es)beforebeginning
installationorservicing.

• Morethanonecircuitbreakerordisconnectswitchmayberequiredtode-energizethe
equipmentbeforeservicing.

• Donotusethemanualoffpositionofthetimerforequipmentservicing.Alwaysdiscon­nectthepoweratthecircuitbreaker(s)ordisconnectswitch(es).

• UseCOPPERconductorsONLY.

• For40amploads,use#8AWGwire,rated90˚Cmin.

• Wireinaccordancewithnationalandlocalelectricalcoderequirements.

DTMV40 Series

TimeInitiated,Temperature,

PressureorTimeTerminatedMulti-Voltage
40ADefrostTimers

WARNING

Risk of Fire or Electric Shock

• Rotatetimerdialclockwiseonly.

CAUTION

Risk of Damage to Timer

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Paragon Precision

TIME INITIATED, TIME TERMINATED

Grasslin

Mode Selection Wiring Diag.

TIME INITIATED, PRESSURE TERMINATED

(Separate Pressure Switch Required (see instructions)

TIME INITIATED, REMOTE TEMPERATURE OR

PRESSURE TERMINATED

STARTUP PROCEDURE

1. Determine model to be replaced (Grasslin or Competitors)
from table below.

2. Set Mode Selection (S1 BLUE DIP Switch
– Fig. A) See table below and instructions
on page 5.

3. Apply corresponding Terminal
Identification and Door labels –see retrofit
kit instructions.

4. Set correct input voltage (S2 RED DIP
Switch – Fig. B).

5. Follow installation and programming instructions.

The DTMV40 can be configured for
either 120 or 208/240VAC. Locate RED
DIP Switch to the right of timer module.
For:

• 120VAC slide DIP switch UP

• 208/240VAC slide DIP switch DOWN

TImer Mechanism

Step 2

Interior
Protective
Cover

Step 1

Ground Lug

2-1/2”

6-1/8”

INSTALLATION

Note: For outdoor locations, raintight, or wet location conduit
hubs that comply with requirements of UL 514B (standard for
fittings for conduit and outlet boxes) are to be used.

1. Open door and then remove interior protective cover by
releasing spring clip on bottom.

2. Remove timer mechanism by releasing spring clip on bot­tom.

3. Select knockouts to be used. Remove inner 1/2” knockout
by inserting a screwdriver in the slot and carefully punch
knockout loose. Remove slug. If 3/4” knockout is required,
remove the outer ring with pliers after removing the 1/2”
knockout. Smooth edges with knife if necessary.

4. Place enclosure in desired mounting location and mark the
three mounting holes (refer to diagram below). Start by
placing set screw on top and attaching enclosure over
keyhole: then screw in remaining two screws on bottom.

5. Connect conduit hubs to conduit before connecting the
hubs to the enclosure. After inserting hubs into enclosure,
carefully tighten hub lock nut. Do not over-torque.

6. Verify voltage selection. 120VAC – position switch UP;
208/240VAC – position switch DOWN (refer to Fig. B).

7. Wire in accordance with National and Local

Codes.

8. Gr

ounding: Terminate all ground wires to ground lug on

bottom of enclosure.

9. Replace interior pro­tective cover.

UL TYPE 3R Enclosure

Bracket Mount

Input Voltage Switch (S2)

Mode Selection Switch (S1)

http://waterheatertimer.org/Intermatic-Defrost-timers-and-manuals.html

8

7

A

M

Models Non-Enclosure Mount

DTMV40-M 24-hour, Mechanism Only

DTQMV40-M 24-hour w/Battery Backup, Mechanism Only

DTMV40-P 24-hour, Panel Mount

DTMV40-B 24-hour, Bracket Mount

DTQMV40-B 24-hour w/Battery Backup, Bracket Mount

PROGRAMMING (Synchronous and Quartz

Models)

Setting the Time:

Turn the minute hand clockwise until the time of day (and AM
or PM) on the outer dial is aligned with the triangle marker on
the inner dial.

Note: All units with Battery Backup provide up to a week of
reserve carryover.

Setting Defrost Initiation Time:

Move a white tab (tripper) on the outer dial outward at each
desired initiation time. For example, to set defrost initiation
times at 6:00AM, 11:30AM, 4:30PM and 11:00PM, move the
tab adjacent to the “M” in AM on the dial (6:00AM), the tab that
lies between 11:30AM and 11:45 AM, the tab between 4:30PM
and 4:45PM, and the tab adjacent to the 11:00–11:15PM
marks. (See note for 8243/6243 replacement.)

Setting Maximum Defrost Duration:

Different defrost durations may be set for each defrost initiation
setting. Each white tab (tripper) provides a 15 minute interval.
The tabs that set the initiation time provide a minimum of 15 min­utes of defrost. For longer defrost duration, move additional tabs
(following in time) from the initiation tab. For example, if a 45
minute defrost is to start 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 adjacent to 7:15-7:30 and 7:30-7:45.
(3 tabs moved outward). The defrost will
initiate at 7:00AM and time terminate at
7:45AM (if temperature termination does
not occur first.)

For electronic models, refer to sepa­rate programming instructions.

DO NOT ROTATE MINUTE HAND COUNTER-CLOCKWISE

Model Designation

Models Enclosure Mount

DTMV40 24-hour, Outdoor UL TYPE 3R Enclosure

DTQMV40 24-hour w/Battery Backup,

Outdoor UL TYPE 3R Enclosure

DTMV40-IM 24-hour, Indoor Metal UL TYPE 1 Enclosure

Note: It is necessary to apply power across terminals 1&N
in order to perform electrical test.

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