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Fan Powered Variable Volume Terminal uniTs
INSTALLATION & MOUNTING INSTRUCTIONS
Fan and motor maintenance
1.
Disconnect all incoming power before servicing the unit.
2.
Price fan powered terminal units are supplied with
permanently lubricated motors.
3.
The blower and motor should be inspected annually for
accumulation of dust and dirt. Clean as necessary.
4.
To access blower and motor for servicing, remove
the bottom access panel or alternate access panels if
equipped (see sketch on page 7).
CauTion:
Motor may be very hot. Ensure motor has cooled
before service.
5.
Motors are provided with thermal overload protection.
If the motor overheats and trips the thermal overload, it
will automatically reset after cooling down to a proper
operating temperature.
6.
If the fan motor is turned off while the primary air system
is operational the following start-up procedure should be
employed for constant volume units.
i.
Override the primary air damper to the closed position
as follows:
Pneumatic - Apply main air to the damper actuator
for normally open units or disconnect main air for
normally closed units.
Electronic - Disengage gears of the electric actuator
with the clutch button and manually close damper.
DDC - Use DDC software to override damper.
ii.
Wait at least 2 minutes to allow the fan wheel to stop
rotation.
iii.
Turn power on to the terminal unit
iv. Restore damper to normal position. The above
procedure will prevent backward rotation of the fan
motor on start-up.
7.
If field amperage draw readings of the fan motor are
required, measurements should be taken with a true RMS
meter. Non-true RMS meters will not provide accurate
reading due to alteration of the sine wave by the fan speed
control. Refer to Page 8 for maximum motor operating
amps.
Filter(s)
1.
Filters, if supplied, should be replaced or removed after
system start-up.
2.
If filters are used beyond system start-up they should be
changed regularly to avoid excessive restriction of air flow.
Frequency would depend on environment.
3.
Refer to the "Replacement Parts" section of this manual
for list of replacement filter media.
operating Guidelines
4.
Downstream duct static pressure is a minimum 0.1" W.G.
0.2" W.G. required for units with electric heater for stable
control operations.
5.
If electric duct heaters are supplied, 70 CFM/kW minimum
air flows across the heater must be maintained.
6.
If electric duct heaters are supplied, the discharge air
temperature must not exceed 120°F.
7.
If electric duct heaters are supplied the primary valve
damper should be closed or in a closed position. During a
heating cycle if the damper is wide open airflow produced
by the unit's fan is allowed to travel upstream of the unit.
Insufficient air velocities passing through the coil elements
could cause the elements to overheat which could trigger
safety alarms. Price recommends having the primary valve
damper closed when no primary air is sensed.
priceindustries.com | FAn Powered VArIAbLe VoLume TermInAL unITs - manual
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