15
ASPT**14** air handlers feature energy efficient blower
motors. The motors run at a constant torque with very
low power consumption and are energized by 24 VAC.
Adjust the CFM by changing the 24 VAC leads to the de-
sired speed tap on the terminal block. The ASPT blower
motor speeds are programmed to deliver adequate air-
flow at rated external static pressure and with 60 sec
-
ond off time delay. For details, refer to the specification
sheet applicable to your model.
NOTE:
In some models, not all speed taps are allowable
for certain electric heat applications. Refer to Table 6 for
minimum speed.
13 Achieving 1.4% Low Leakage Rate
Ensure all the gaskets remain intact on all surfaces as
shipped with the unit. These surfaces are areas between
the upper tie plate and blower access panel, blower access
and coil access panels, and between the coil access and
filter access panels. Ensure upon installation, that the plastic
breaker cover is sitting flush on the blower access panel and
all access panels are flush with each other and the cabinet.
With these requirements satisfied, the unit achieves less
than 1.4% airflow leakage when tested in accordance with
ASHRAE Standard 193.
14 Start-Up Procedure
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING
OR INSTALLING THIS UNIT. MULTIPLE POWER
SOURCES MAY BE PRESENT. FAILURE TO DO
SO MAY CAUSE PROPERTY DAMAGE, PERSON-
AL INJURY OR DEATH.
• Prior to start-up, ensure that all electrical wires are
properly sized and all connections are properly tight-
ened.
• All panels must be in place and secured. For Air Tight
application, gasket must be positioned at prescribed
locations to achieve 1.4% leakage.
• Tubing must be leak free.
• Condensate line must be trapped and pitched to al-
low for drainage.
• Low voltage wiring is properly connected.
• Auxiliary drain is installed when necessary and
pitched to allow for drainage.
• Unit is protected from vehicular or other physical
damage.
• Return air is not obtained from, nor are there any re-
turn air duct joints that are unsealed in, areas where
there may be objectionable odors, flammable vapors
or products of combustion such as carbon monox-
ide (CO), which may cause serious personal injury
or death.
15 Regular Maintenance
The only item required to be maintained on a regular basis
by the user is the circulating air filter(s). Filter should be
cleaned or replaced regularly, typically once per month. A
certified service technician must perform all other services.
IMPORTANT NOTE:
If thumb screws are used to access
the filter, ensure the washer installed on the screw behind
the access panel remains in place after re-installation.
