Midco J121-DS Parts List

Replacement Parts

List

• Features S87D Honeywell Electronic Control.

Incinomite Model J121-DS

Installation and Service Manual - 8471 15

Date Code - 5099 or later

Midco® International Inc.
4140 West Victoria Street
Chicago, Illinois 60646
toll free 866.705.0514
tel [phone]
fax [phone]
web www.midcointernational.com
e-mail [e-mail]

• First production December 21, 1999 (date code 5099).

• Model J121-DS ignitor assembly features an air adjustment screw to modify gas air ratios or
improved pilot light off with air shutters full open.

• Model J121-DS Features S89E Special J121-DS with 120 volt ignition transformer (date
coded - 2002 )

AVOID ERROR IN PARTS SELECTION. When ordering use complete MIDCO Part Number and Description. Furnish
Burner Model Number, Bill of Material Number and Serial Number (if available) from the specifi cation plate found on the
product.

IMPORTANT: Availability of parts as well as specifi cations are subject to change without notice. Please consult factory for
item availability.

1012

Quality Designed for Proven Performance

8472 72

Printed in USA

Exploded View

5734-50

6416-90

Refer to listing for proper application

2

Midco International Inc.

Parts List

Part # Description Part # Description

5734-50 Transformer 115/1/50-60 Primary,

24V-30VA Secondary (Basler BE121620-

GDD,BE12162OGAA; Prod Unlt’d 4000-

01C02J232,4000-01C02K232, 4000-

01M04K232, 4000-01M04J232)
6416-90 Inlet Ring and Screen Replacement Kit
6400-80 Blower Housing Replacement Kit (order
Blower Wheel, Motor, Shutters, Inlet
Screen, Manifold, etc., separately)
6401-90 Shutter Replacement Kit
6403-00 Manifold
6404-90 Input Adjuster Screw Assembly
6406-00 Blast Tube - J121-DS
6407-30 Flange Gasket
6407-90 Mounting Flange Replacement Kit (order
Gasket separately)

IGNITOR CONTROL PIPING
Assembly includes Brass Orifi ce Tee (with drilled Orifi ce)
Pressure Tap, Regulator and Compression Fitting

6412-96 J121-DS NATURAL -- #50 Drill (.070)
6412-98 J121-DS PROPANE -- #52 Drill (.063)

6413-09 Ground Barrier Kit
6415-00 Blower Wheel - J121-DS
6416-90 Inlet Ring and Screen Kit
6417-52 Main Gas Port and Tube Kit -- J121-DS
PROPANE
6417-54 Main Gas Port and Tube Kit -- J121-DS
NATURAL

6418-00 Electrode (spark or fl ame) - 2 required
6443-50 Motor 1/6 HP 115/230/1/50/60 TENV --
J121-DS only
6447-00 Input Stop Nipple
6458-03 J121-DS Spark Wire Assembly
6458-04 J121-DS Sense Wire Assembly
6458-51 Electric Wires, Boots and Strain Reliefs
(J121-DS Standard Only)
6481-70 Ignitor Gas Inlet Block, Tube and Ignitor Tip
Assembly -- J121-DS
6481-90 Ignitor Assembly - J121-DS
6622-40 Input Adjuster Cap
8400-00 Ignitor Regulator 1/8 NPT (Maxitrol RV12,
RV12LT)
8402-36 1″ NPT Gas Valve 24/1/50-60 -- J121-DS
(ITT K3A461S)
8408-42 10 Positional Terminal Strip
8408-76 3-Amp Type 3AG Glass Fuse -- 1/4″ Dia. x
1-1/4″ LG
8423-05 On-Off Toggle Switch
8425-18 Thermal Switch (T-O-D 60T-13-203420)
8425-19 Blower Air Switch -- J121-DS
8429-03 * DSI Electronic Control Board
(MH S87D1087)
8429-31 * DSI Electronic Control Board
(MH S87K1016)
8445-25 Latch Body
8445-26 Latch Body Snap clip
8429-48 * DSI Electrical Control Board
(MH S89E1058)
8447-22
8450-59 Input Adjuster Sealing Gasket
2030801 1 PROPANE Conversion Kit -- J121-DS

1, 2

Ignitor Spark Generator

Not Shown
5233-95
(S89E Only)

* For proper electronic control selection refer to Bill of
Material Number on the burner spec plate and consult
factory, as they are not interchangeable.

NOTATIONS:

1

Not Illustrated.

2.

Used on J121-DS with S89E control Only.

Midco International Inc.

1, 2

J121-DS Sense Wire Assembly -

3

Midco® International Inc. - 4140 West Victoria Street - Chicago, Illinois 60646 - toll free: 866 705 0514

4

tel: [phone] - fax: [phone] - web: www.midcointernational.com - e-mail: [e-mail]

1012

8472 72

Printed in USA