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taBle oF contents / si (metric) conversion Factors / unit location
table of contents
Inspection upon Arrival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SI (Metric) Conversion Factors . . . . . . . . . . . . . . . . . . . . . . . . 3
Unit Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Location Recommendations . . . . . . . . . . . . . . . . . . . . . . . 3
Sound and Vibration Attenuation . . . . . . . . . . . . . . . . . . . 4
Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Suspended Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Rail Mounted Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Slab Mounted Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Roof Curb Mounted Units . . . . . . . . . . . . . . . . . . . . . . . . . 6
Roof Curb Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Duct Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Utility Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Unit Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10
Gas Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Manifold Arrangements . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Prior to Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
Controls Descriptions . . . . . . . . . . . . . . . . . . . . . . . . 11-16
Controls Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Gas Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-23
Blower/Motor Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 21
Adjusting Burner Profile Pressure Differential. . . . . . . . . 22
Setting the Dirty Filter Switch . . . . . . . . . . . . . . . . . . . . . 23
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Control Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-26
General Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Accessory Static Pressure Drop and
Blower Performance Data . . . . . . . . . . . . . . . . . . . . . 28-31
Blower Sheave Assembly Data . . . . . . . . . . . . . . . . . . . . . . . 32
Unit and Accessory Dimensions. . . . . . . . . . . . . . . . . . . . 34-39
Unit and Accessory Weights . . . . . . . . . . . . . . . . . . . . . . . . . 40
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41-42
Service and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 42-43
Control Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Start-up Report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Replacement Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . 46
Model Nomenclature/Serial Number Format . . . . . . . . . . . . . 47
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Page
table 3.1 - si (metric) conversion Factors
to convert
multiply By to obtain
"W.C.
0.249
kPa
°F
(°F-32) x 5/9
°C
Btu
1.06
kJ
3
Btu/ft
37.3
kJ/m
Btu/hr
0.000293
kW
3
3
CFH (ft
/hr)
0.000472
m
/min
3
3
CFH (ft
/hr) 0.00000787
m
3
3
CFM (ft
/min)
0.0283
m
/min
3
3
CFM (ft
/min)
0.000472
m
to convert multiply By to obtain
feet
0.305
Gal/Hr.
0.00379
Gal/Hr.
3.79
3
gallons
3.79
Horsepower
746
inches
25.4
/s
pound
0.454
psig
6.89
/s
psig
27.7
unit location
Appliances must not be installed where they may be exposed
to a potentially explosive or flammable atmosphere.
Do not install direct-fired units down stream from any
cooling system which utilizes refrigerants for cooling.
location recommendations
1.
Do not locate any gas-fired equipment where chlorinated,
halogenated or acid vapors are present in the combustion
air atmosphere.
2.
When locating units, consider general space and heating
requirements and availability of gas and electrical supply.
3.
Where necessary to provide working clearance beneath
the unit, the unit shall be installed at a suitable height
above the floor or otherwise adequately protected.
4.
Be sure the structural support at the unit location is
adequate to support the weight of the unit.
5.
For economical installation and operation, locate each unit
close to the space it will serve, and close to the utilities
that will serve the unit.
6.
Adequate building relief must be provided so as to not
over-pressurize the building when the heating system is
operating as its rated capacity. This can be accomplished
by taking into account, through standard engineering
methods, the building structure design infiltration rate; by
providing proper sized relief openings; by interlocking a
power exhaust system; or by a combination of these
methods.
7.
The heater inlet shall be located in accordance with the
applicable code provisions for ventilation air.
8.
For model MDB (100% Make Up Air) units, all air
to the unit must be ducted directly from the outdoors.
Recirculation of room air is not permitted over the burner.
For model MRB (Return Air) units, recirculation of room air
is permitted if it does not pass over the burner. Return air
ductwork must be ducted to the return air opening only,
while all air passing over the burner must be ducted
directly from the outdoors.
9.
Be sure that the minimum clearances to combustible
material and recommended service clearances are
maintained. Units are designed for installation on non-
combustible surfaces or combustible surfaces with the
minimum clearances shown in Table 3.2
10. Field constructed intake accessories should be properly
designed to minimize the entry of snow and rain.
m
3
11. If in doubt regarding the application, contact your local
m
/hr
Modine Manufacturing sales representative.
l/hr
l
W
mm
table 3.2 - combustible materials and service
kg
clearances
kPa
"W.C.
Minimum Clearances to
Model
Combustible Materials
Size
Top
All
6"
7-500.10
danGer
WarninG
Minimum Clearance
For Service Access
Bottom Sides Ends
0"
6"
6"
(Both Sides)
30"
3
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