Checking Motors, Belts And Sheaves; P-Cone; Figure 40 - V-Belt Drive Kit Label - York AHU Operation And Maintenance

FORM 102.20-OM2
ISSUE DATE: 6/01/2015
Static Pressure
• Solution XT - Maximum design cabinet pressure
is ± 8 in WC at 1% leakage.
• YORK Custom - Maximum design cabinet pres-
sure is ± 10 in WC at 0.5% leakage.
• Access doors are double walled. Doors are pro-
vided with adjustable door latches and seals.

Checking Motors, Belts and Sheaves

Motors
Do not operate fan motors in overload
amperage conditions. Motors are designed
to operate within the stated Service Factor
(SF) on the motor nameplate.
Motor amperage should be checked again after the
connecting ductwork is installed, and an air balance
is performed on the air distribution system. If the mo-
tor operates at amperage levels above the nameplate
limits, discontinue operation and correct the cause, or
refer to SECTION 3 - MAINTENANCE in this manual
Belts
Check belts for correct tension at start-up, and again
after 24 hours of operation. On multiple belt adjust-
able pulleys, check the pitch depth to insure identical
belt travel, power transfer and wear. Adjustable motor
bases are provided for belt adjustment.
Sheaves
If optional adjustable sheaves are provided, replace
them with correctly sized fixed sheaves immediately
after the system air balance is performed. It is not un-
usual for an adjustable sheave to create damaging vi-
bration in the fan assembly.
Replacing Sheaves
Use the following instructions to replace the sheaves.
1. Measure the outside diameter of a belt while it is
seated into at least one half the circumference of
an adjustable sheave groove, which is the sheave
pitch diameter.
JOHNSON CONTROLS
SECTION 2 - START-UP AND OPERATION
2. Order a good quality, pre-balanced sheave or
sheave and bushing assembly that matches the
pitch diameter, belt cross section, and bore size
from Airside Parts at (800) 545-7814. Provide the
following information:
• Drive tag information as shown in Figure 40
on page 51. On Solution XT AHUs, label
will be located on the fan assembly near the
belts.
• New fan RPM
• Measurement of pitch diameter at which the
adjustable sheave is set.
• Job Identification Number from the AHU ID
label.
A new driver (motor) sheave,or sheave and bushing are
usually all that is required to directly replace the cur-
rent adjustable driver sheave.

FIGURE 40 - V-BELT DRIVE KIT LABEL

P-Cone

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Operation of the P-Cone
The P-Cone has no moving parts; it cannot be turned
®
on or off or adjusted. Each of the two piezometer rings
on the exterior side of the inlet cone are fitted with a
0.25 union brass tee. The two tees are the connection
points for running pneumatic tubing from the P-Cone
to an air pressure gauge/switch/readout. This P-Cone
will automatically produce a pressure differential sig-
nal whenever the fan is moving air.
LD16580
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51
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