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C.
INSTALLATION
C.1 Description
Two basic types of Ruffneck™ Heat Exchanger configurations are
available from Thermon.
1.
FR (Frost Resistant) Series - for steam service only, up to
100 psi (690 kPa) on select models
2.
HP (High Pressure) Series - for steam and liquid service up
to 400 psi (2,700 kPa) on select models
C.2 Location of Heaters
The following guidelines have been established by Thermon
to ensure that you properly locate the heaters in your building.
These are only suggestions, and variations may be deemed
necessary depending on application.
1.
When occupant comfort is the major objective, heaters
should be positioned so that the airflow is directed to areas
of highest heat loss (i.e., doorways, windows and outside
walls).
2.
For personnel comfort, a less turbulent and more even
air distribution is required. To achieve this effect a larger
quantity of smaller unit heaters should be installed.
3.
When equipment protection is of utmost concern, heaters
should be positioned so that the airflow is directed
towards the equipment.
4.
In very large areas, arrangement of heaters should be such
that the air will exit from one heater and be projected
towards the inlet, or back, of another heater. A rotational
airflow will result, with air circulation in the central area of
the building.
5.
When arranging heaters, check the fan throws for the
heaters being mounted (see table below). Although it is
not generally required that the fan throws reach the next
heater, air circulation must be sufficient to prevent cold
spots from occurring.
6.
Do not install heaters such that airflow is blocked or
impeded by equipment or walls.
7.
For warehouses or large workshops, it may be acceptable
to use fewer, but larger, heaters mounted well above floor
level. It has to be recognized, however, that only the largest
heaters have long fan throw distances.
Table 1 – Fan Throws
Model
Motor HP
FR/HP-12
1/2
FR/HP-16
1/2
FR/HP-20
1/2
FR/HP-24
1/2
FR/HP-30
3/4
FR/HP-36
1 1/2
Throw
RPM
ft
1725
40
1725
60
1725
65
1725
70
1140
70
1725
60
C.3 Noise Levels
Where personnel inhabit a room or building for long periods of
time, and local ambient noise levels are low, the noise from the
heaters has to be considered. Typically, the smaller the heater
the lower the noise level will be. The largest heaters that move
large volumes of air are noticeably noisier than units handling low
volumes of air.
Table 2 – Measured sound levels
Model
FR/HP-12
FR/HP-16
FR/HP-20
FR/HP-24
FR/HP-30
FR/HP-36
Sound levels were measured at a distance of 15 feet with louver blades
horizontal and sound meters on centre line of heater (i.e., in line with motor/
fan shaft).
C.4 Mounting
1.
Although Ruffneck™ Unit Heaters are designed to be
installed in an upright and level position, they may be
installed in other positions. However, for steam service
the inlet must be above the outlet and the bottom of the
core must drain toward the outlet. They are designed to
be suspended from the top of the cabinet either with
two or four (depending on model) 5/8" NC bolts screwed
into internally threaded holes provided in the cabinet top
panel. It is essential that adequate structural support be
provided for installation.
2.
Basic Mounting Kits (BMK), Hanging Mounting Kits (HMK),
Swivel Hanging Mounting Kits (SHMK) or Wall Mounting
Kits (WMK) are available for Ruffneck™ heaters. If the
strength of the structure is not adequate to support the
units, a suitable alternative such as the Ruffneck™ Pipe
Mounting Kit (PMK) would be recommended to ensure
safe and proper operation. The HMK is the only suitable
mounting kit for the 30" and 36" heater models.
3.
Where heaters are installed in applications that are of a
relocating or transportable nature such as land or offshore
drilling rigs, an adequate mounting structure should be
supplied to withstand all probable load conditions. Such
load conditions should recognize abuse situations such
as truck off-loading impacts, etc. It is recommended that
lock washers be used beneath the bolt heads for these
installations.
4.
Heaters may be mounted at any reasonable height above
floor level depending on the purpose of the heater. When
equipment is placed in a seldom occupied building, the
heaters may be placed at a low level. When heaters are
required to ensure personnel comfort, they should be
mounted overhead. Typical mounting heights range from
7.5 ft to 12 ft. CSA certified heaters must be mounted at
a minimum height of 7.9 ft (2.4 m) above the floor. All
Ruffneck™ heaters have louvers installed that allow air flow
to be directed from horizontal to 60° or greater downward
deflection. Louvers should never be set to within less than
15° of the closed position.
dBA
Rear
Front
61
70
66
74
74
76
5 5
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