Operating instructions

OMM-09-0509-page 4
1. Mounting Blower By Inlet Flange only;
a. With motor shaft horizontal (parallel with floor):
If mounting the blower by the inlet flange only and with the motor shaft horizontal (parallel with floor), it is very
likely additional support under the motor will be required.
b. With motor shaft vertical (perpendicular to floor):
This is the best way to mount an Arrangement 4HM blower as long as the mounting plate the flange will be
bolted to is rigid enough to support the weight of the blower/motor assembly.
2. Mounting Blower By Discharge Flange only;
a. With motor shaft horizontal or
vertical:
Because of the forces involved, it will most likely be necessary to add additional support under the motor.
Mount the blower and take the vibration readings as shown in Fig. 2 on page 8. If they exceed the maximums
shown in Fig. 3 on page 9, you will need to add additional support.
C. Duct Work Connections:
All ducting or accessories, added by the user, should be independently supported. DO NOT use the blow-
er/motor assembly to support any additional weight. Inlet and/or discharge duct elbows should be located a
minimum of 2 blower wheel diameters from the blower. Any duct elbows located closer than 2 wheel diameters to
the blower inlet or discharge WILL reduce the air performance and blower efficiency. Any duct elbows near the
blower discharge should be in the same rotational direction as the blower rotation.
Non-Ducted Blower Inlet:
Any blower with no ducting on the inlet must have an inlet guard. The blower should be located so the blower inlet
is, at least, 1 wheel diameter away from any wall or bulkhead to eliminate a reduction in air flow.
Non-Ducted Blower Discharge:
Any blower with no ducting on the discharge must have a discharge guard.
D. Safety Guards:
Cincinnati Fan offers guards, as optional, to keep your blower in compliance with OSHA safety regulations. These
include inlet or discharge guards. Any blowers built with high temperature construction, a “heat slinger guard” is
standard. It is the responsibility of the user to make sure this blower meets all local, state and OSHA safety regula-
tions. If you have a specific guard requirement not covered by OSHA, please contact the local Cincinnati Fan sales
office for assistance.
E. Dampers and Valves: (Airflow control devices)
If the blower is supplied with any type of air flow control device, it should be closed before initial start-up of the
blower to minimize overloading of the motor. Any airflow control device, with bearings, should be maintained in
accordance with the manufacturers instructions. Any air flow control device, with an automatic control mechanism,
should be adjusted per the manufacturers recommendations.
In all cases where the blower flange will be the only connection with another structure, the structure MUST be
braced enough and/or rigid enough so as not to allow a resonance vibration to occur. Some form of additional
bracing under the motor, supplied and installed by the customer, might be required to maintain vibration
levels below the maximum limits as indicated in Fig. 3 on page 9. If the blower has an inlet and
a discharge
flange, be careful not to cause “binding” when bolting them down. That will most definitely cause a vibration
problem.
CAUTION
B. Mounting Methods:
An Arrangement 4HM blower is an Arrangement 4, direct driven blower without the bottom base under the motor.
If the motor being supplied is a foot mounted motor, an angle base must be used to connect the blower to the
motor. A C-Face motor can be bolted directly to the housing without using an angle bracket. Most Arrangement
4HM blowers are supplied with an inlet or discharge flange for mounting the blower to some type of equipment.
Some are supplied with both inlet and discharge flanges.