Page 1
V
ERTICAL
S
ECTION
6-32 x 3/8"
MOUNTING
SCREWS
VIEW "A" VIEW "B"
ROTATE HUB
HUB
LOOSEN
SIX
SCREWS
ROTATE HUB
Mechanical Accessories
VERTICAL
SECTION
VIEW "B"
1/2"
(12.7mm)
SPACER
10-32
NUT
ANEMOSTAT DIFFUSER
10-32 x 3/4"
M
OUNTING
SCREWS
10-32 x 3/8"
MOUNTING
SCREWS
10-32
NUT
VERTICAL
SECTION
VIEW "A"
ANEMOSTAT DIFFUSER
For MUH, HUHAA, Dayton 3UF75 - 3UF98 and 2YU58 - 2YU81,
3END3 and 3END4 Series Unit Heaters
INSTALLATION OF VERTICAL SECTION
Common Part for Radial and Anemostat Diffusers)
(
RDM, RDS, RDL, ADM, ADS, ADL, 2E592 and 2YU34
1. Remove louvers from front of heater by gripping louver close to
spring and compressing spring until other end of the louver is free.
2. For Dayton Unit Heaters - Remove bird screen from venturi opening.
3. Position vertical section over venturi outlet and rotate vertical section
until holes in mounting brackets align with matching hole in front of
heater.
4. Secure vertical section with four No. 6-32 x 3/8” (9.5mm) mounting
screws (supplied) as shown in Figure 1.
Figure 1. Installation of Vertical Section
INSTALLATION OF RADIAL DIFFUSER
RDM, RDS, RDL, 2E592 and 2YU34
1. Mount vertical section (supplied as part of radial diffuser). (Refer to
INSTALLATION OF VERTICAL SECTION above.)
2. Loosen all six screws in radial diffuser hub until blades move freely
(See Figure 2, View A).
3. Rotate the radial diffuser hub clockwise until the radial diffuser can
be inserted into the vertical section.
4. Insert blade rods into matching holes in vertical section while rotat-
ing the radial diffuser hub counter-clockwise. (See Figure 2, View B).
5. Center all blades radially and tighten screws enough to allow each
blade to rotate yet maintain a set position.
6. Rotate each blade to desired position and tighten screws to secure
blades.
INSTALLATION OF LOUVERED DIFFUSER
ON HUHAA & DAYTON HEATERS
DS, LDM and LDL
L
1. Louvers may be left in place or removed from the heater. (Refer to
Step 1, INSTALLATION OF VERTICAL SECTION).
2. Place louvered diffuser against front of unit.
NOTE: Position locating tabs toward the top and sides of heater
flange.
3. Secure louvered diffuser to heater with three (3) screws (provided)
through the mounting tabs.
INSTALLATION OF ANEMOSTAT DIFFUSER
ADM, ADS, AND ADL
1. Mount vertical section (supplied as part of anemostat diffuser).
(Refer to INSTALLATION OF VERTICAL SECTION.)
2. For small (-S) and large (-L) diffusers, slide anemostat over vertical
section and secure with three No. 10-32 x 3/8” (9.5mm) bolts and
nuts. (See Figure 3, View A).
3. For medium (-M) diffuser, slide anemostat into vertical section and
secure with three No. 10-32 x 3/4” (19mm) bolts, nuts and spacers.
(See Figure 2, View B).
Figure 3. Installation of Anemostat Diffuser
1. Louvers may be left in place or removed from the heater. (Refer to
2. Insert mounting springs into four 3/16” (4.8mm) holes in inside
3. Place louvered diffuser against front of unit.
NOTE: Position locating tabs toward the top and sides of heater
flange.
4. Secure louvered diffuser to heater by using long-nosed pliers to
Figure 2. Installation of Radial Diffuser
INSTALLATION OF LOUVERED DIFFUSER
ON MUH HEATERS
LDS, LDM and LDL
Step 1, INSTALLATION OF VERTICAL SECTION ).
flange of front cover.
hook free ends of springs into four 3/16” (4.8mm) holes in inside
flange of louvered diffuser.
INSTALLATION OF MOUNTING BRACKETS
B10, B20, B30, B50, 6X966, 6X967, 3UG64, 3UG65,
2YV16, 2YV17, 2YU91 and 2YU92
WARNING
THE BUILDING STRUCTURE AND THE ANCHORING PROVISIONS MUST BE SUFFICIENT TO SUPPORT THE COMBINED
WEIGHT OF THE HEATER AND MOUNTING BRACKET.
1. Locate the position of the heater wall mounting bracket. Refer to
Figure 4 for minimum mounting clearances. Refer to Figure 5 for
mounting bracket dimensions.
WARNING
MOUNTING BRACKET MUST BE INSTALLED WITH OPENING
IN BRACKET TOWARD REAR OF HEATER.
2. The hole locations for the mounting bracket can be determined by
holding the bracket in position and marking through the holes.
Mounting bracket dimensions with hole locations are also given in
Figure 5.
3. A minimum screw size of 3/8-inch (9.5mm) diameter should be used
to mount the bracket to the wall or ceiling. A heavy washer should
be used between the bolt head and the bracket. USE THE TYPE OF
SCREW THAT IS BEST SUITED TO THE BUILDING STRUCTURE.
4. Remove four bolts and washers from top of heater and secure unit
mounting bracket to top of heater using the four bolts and washers.
(See Figure 6).
5. Bolt the unit mounting bracket to the wall mounting bracket using
one 1/2-13 pivot bolt, two flat washers, one split lockwasher, and
one 1/2-13 nut. (See Figure 7).
1
Page 2
V
Q
C
EILING
S
IDE
W
ALL
V
Q
H
Q
C
EILING
S
IDE
W
ALL
C
EILING
B
ACK
W
ALL
B
RACKET TO SIDE BRACKET TO REAR
B
RACKET TO REAR
H
EATER HEATER HEATER
Minimum Mounting Clearances For Horizontal Discharge
3/4"
C
D
1
-1/2"
L
B
A
E
M
1-1/2"
UNIT MOUNTING
BRACKET
OPENING MUST FACE
REAR OF HEATER
WASHER
MOUNTING BOLTS
H
EA
TER
FRO
NT
AA
BB
HEATER
BACK
5/16" BOLTS,
LOCKWASHERS
AND NUTS
(4 LOCATIONS)
BRACKET
ATTACHMENT BOLT
(4 LOCATIONS)
WALL MOUNTING
BRACKET
CEILING MOUNT
1
/2-13
NUT
1/2"
SPLIT
L
OCKWASHER
1
/2"
FLAT WASHER
1/2"
FLAT WASHER
1/2-13
B
OLT
Heaters Ceiling Side Wall Back Wall H (Min.) V (Min.) Q
3 KW - 5 KW 2” (51mm) 6” (152mm) 9” (229mm) 13” (330mm) “0” 183/16” (462mm)
7.5 KW - 10 KW 6” (152mm) 6” (152mm) 13” (330mm) 151/2” (394mm) 2” (50mm) 277/8” (708mm)
15 KW - 20 KW 6” (152mm) 9” (229mm) 121/2” (318mm) 181/2” (470mm) 2” (50mm) 277/8” (708mm)
25 KW - 50 KW 16” (406mm) 12” (305mm) 18
Figure 4. Mounting Bracket Clearances
Model No. Used on
B10, 6X966, 2YV16 3 - 10 KW
B20, 6X967, 2YV17 15 - 20 KW
B30, 3UG64, 2YU91 25 - 30 KW
B50, 3UG65, 2YU92 40 - 50 KW
1
/2” (470mm) 251/2” (648mm) 105/8”
(270mm)
463/16” (1173mm)
Heater Size
Dimensions 3-20 KW 25-50KW
A7
B9
C7
D1
E2
L 201/2” (521mm) 285/16” (719mm)
M9
1
/4” (184mm) 97/16” (240mm)
1
/2” (241mm) 143/8” (365mm)
1
/4” (184mm) 121/8” (308mm)
15
/16” (49mm) 21/16” (52mm)
1
/4” (57mm) 3” (76mm)
15
/16” (253mm) 1415/16” (380mm)
Figure 5. Mounting Bracket Hole Dimensions
Catalog No. Used on
CMB-10 3 - 10 KW
CMB-20 15 - 20 KW
CMB-30 25 - 30 KW
CMB-50 40 - 50 KW
Figure 6. Installation of Unit Mounting Bracket
INSTALLATION OF CMB MOUNTING BRACKETS
1. Mount bracket per step 4 of Installation of Mounting Brackets, page 1.
2. Hang heater from ceiling using center hole in unit mounting bracket,
maintaining clearances shown in Figure 4.
6/09 ECR 38318
5200-2303-502
Figure 7. Installation of Heater on Mounting Bracket
INSTALLATION OF MOUNTING BRACKETS
VDMB5, VDMB20, VDMB50, 3UG05, 3UG06, 3UG08,
2YU83, 2YU84 and 2YU85
WARNING
THE BUILDING STRUCTURE AND THE ANCHORING PROVISIONS
MUST BE SUFFICIENT TO SUPPORT THE COMBINED WEIGHT OF
THE HEATER AND MOUNTING BRACKET.
1. Locate the position of the vertical discharge mounting bracket. Refer to
Figure 4 for minimum mounting clearances. Refer to Figure 8 for bracket dimensions.
2. A minimum screw size 3/8” diameter should be used to mount two of the
brackets to the ceiling. A heavy washer should be used between the
bolt head and the bracket. Use the type of screw that is best suited
to the building structure.
3. Remove four bolts and washers from the back of the heater and secure
the other two brackets to the back of the heater using the four bolts and
washers.
4. Bolt the unit mounted brackets to the ceiling mounted brackets using the
3/8” bolts, split lockwashers and nuts provided. See Figure 8.
3/8” BOLTS
Model No. KW AB
VDMB5, 3UG05, 2YU83 3 - 5 KW 6” (152mm) 61/8” (156mm)
VDMB20, 3UG06, 2YU84 7.5 - 20 KW 87/8” (225mm) 61/8” (156mm)
VDMB50, 3UG08, 2YU85 25 - 50 KW 121/2” (318 mm) 121/8” (308mm)
Figure 8. Installation of Heater on Mounting Bracket
2
470 Beauty Spot Rd. East
Bennettsville, SC 29512 USA
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