Midco G56B Parts List
UNIPOWER
GB SERIES
REPLACEMENT PARTS LIST
First Construction September 1994; Date code 3794 (37th week, 1994)
Installation Manual 8470-86
GENERAL BURNER PARTS
BURNER CHASSIS
6712-05 Flame Retention Plate with Mounting Screws—
Models G56B, G57B, & G58B
6713-05 Flame Retention Plate with Mounting Screws—
Model G69B
6736-00 Adjustable Alloy Sleeve—Model G56B, G57B &
G58B
6741-00 Adjustable Alloy Sleeve—Model G69B
6755-20 Drawer Assembly with Pilot and Vent Tube.
Order Pilot Gas and Air Orifices separately.
2020300 5” diameter Mounting Flange—Models G56B,
G57B & G58B
2020800 6” diameter Mounting Flange—Model G69B
BLOWER HOUSING
3197-50 Motor Mounting Plate
6755-50 Air Shutter—Models G56B & G57B
3246-08 Air Shutter—Models G58B & G69B
6734-00 Air Shutter Shaft
3152-01 Quadrant—for Air Shutter adjustment
6724-00 Wire Guard (Blower Inlet)
BLOWER WHEELS
6748-00 G56B-51⁄4” diameter x 31⁄2” wide (1⁄2” Bore)
3427-50 G57B-6
5⁄16” diameter x 4” wide (5⁄8” Bore)
3627-50 G58B & G69B-7” diameter x 31⁄2” wide (5⁄8”
Bore)
BLOWER MOTORS 1-Phase, 48M Frame
(3450 RPM,
1⁄2” Shaft)
TEFC
6728-90 G56B-1⁄6 HP 115/230/1/60/50
BLOWER MOTORS 1-Phase, 56C Frame
(3450 RPM,
5⁄8” Shaft)
OPEN DRIPPROOF
8437-31 G57B-1⁄3 HP 115/230/1/60
8437-15 G58B-1⁄2 HP 115/230/1/60
8437-25 G69B-3⁄4 HP 115/230/1/60
DRAWER ASSEMBLY COMPONENTS
6717-91 Flamerod Wire Assy
7122-90 Peep Sight Assembly—with Gasket and
Mounting Screws
5616-90 Strain Relief Bushing for Spark Cable
8408-10 Silicone Boot for covering Spark Cable to Rod
Connection
8509-05 Spark Cable
PILOT COMPONENTS AND
ACCESSORIES
6725-90 Pilot with Flamerod and Spark Rod Assemblies
Mounted
6717-00 Flamerod and Insulator Assembly
6720-90 Mounting Clamp for Flamerod Assembly
6725-50 Spark Rod and Insulator Assembly
6764-00 Spark Rod Retainer Assembly with O-Ring
Seal
8432-07 Spark Rod Retainer O-Ring. Parker 2-014—
0.489” I.D. x 0.070 thick
8400-10 Pilot Pressure Regulator,
1⁄4”—NATURAL and
PROPANE (1⁄2 PSI maximum inlet pressure)
8402-37 Gas Safety Shut-Off Valve
—1⁄8”NPT; 24/1/60
6729-91 Pilot Air Tube—Blower Housing to Drawer
Assembly
PILOT GAS AIR ORIFICES
FLAME SAFEGUARD AND ACCESSORIES
8429-26 Honeywell S8680J 30 second prepurge 100%
lockout
8447-27 Control Transformer 120/24V 75VA
8406-68 DPST Relay (Aromat: JH2A-W-AC120V-Q,
Potter Brumfield: T9S7A22-120)
8425-19 Blower Air Switch (Chicago Safety Prod. #SMP;
Tridelta #FP4039)
N/A High-Low Single Body Gas Pressure Switch
N/A Low Gas Pressure Switch (MHC645B)
N/A High Gas Pressure Switch (MHC645A)
8425-18 Thermal Switch (Therm-O-Disc, 60T-13-
203125)—Incinerator applications only.
NATURAL
PROPANE
BURNER
MODEL
G56B
G57B
G58B
G69B
G56BP
G57BP
G58BP
G69BP
GAS
#60 Dr. (.040)
#60 Dr. (.040)
#55 Dr. (.052)
#55 Dr. (.052)
#64 Dr. (.036)
#64 Dr. (.036)
#56 Dr. (.046)
#56 Dr. (.046)
AIR
#26 Dr. (.147)
#30 Dr. (.128)
#26 Dr. (.147)
#26 Dr. (.147)
#26 Dr. (.147)
#30 Dr. (.128)
#26 Dr. (.147)
#26 Dr. (.147)
KITS
6766-00
6766-01
6766-02
6766-02
6766-05
6766-06
6766-07
6766-07
MIDCO International Inc.
4140 WEST VICTORIA STREET, CHICAGO, ILLINOIS 60646 / (312) 604-8700 / FAX (312) 604-4070
PRINTED IN U.S.A
Rev 100
8472-61
ORIFICES
MAIN GAS TRAIN COMPONENTS
V88A DIAPHRAGM VALVES 24V
8419-54 11⁄4”
8419-55 11⁄2”
8419-56 2”
SOLENOID VALVES
SAFETY VALVES (normally closed)
8402-42 11⁄4”
8402-43 1
1⁄2”
8402-44 2”
PRESSURE REGULATORS—MAXITROL
RV SERIES
8416-02 1
1⁄4” RV61
8416-05 11⁄2” RV81
8416-08 2” RV91
MANUAL BALL VALVES (with side pressure tap)
8404-24 1
1⁄4”
8404-25 11⁄2”
8404-26 2”
FIRING RATE CONTROLS
BF VALVES (Butterfly Valves)
2933-50 1”
2933-51 1
1⁄4”
2933-52 11⁄2”
2933-53 2”
-2-
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