johNSoN coNtroLS
3-8
ForM 102.20-N1 (1109)
Startup
Check doors and latches for Proper
Adjustment
See IOM Section 5 “Door Handle/Latch Replacement
and Adjustment
”
.
Plastic spacers must be removed be-
tween doors and doorframes before
Start-up.
Sheaves
If optional adjustable sheaves pro-
vided, we strongly recommend they
be replaced with correctly sized fixed
sheave immediately after system air
balance is performed. It is not unusual
for an adjustable sheave at some point
in time to create damaging vibration
in the fan assembly.
General Guidelines for Replacing an Adjustable
Sheave with a Fixed Sheave:
• Measure the outside diameter of a belt while it is
seated into at least one half the circumference of
an adjustable sheave groove. Use this measure-
ment as the sheave "pitch diameter". Order a
sheave or sheave and bushing combination that
matches pitch diameter, belt cross section and
bore size. Order a sheave of good quality and
require that it is prebalanced.
•
Reference Airside Parts - phone (800) 545-7814
to purchase new sheaves.
- Provide the following information:
- Drive tag information (see Fig 3-8).
- New fan RPM
- Measurement of pitch diameter adjustable
sheave is set at.
- Job ID number from YORK Solution Unit
ID Label.
• A new driver (motor) sheave or sheave and bush
-
ing are usually all that is required to directly
replace the present adjustable driver sheave.
Fig. 3-8 – tYPiCAl dRiVE Kit dAtA tAg
Содержание YORK SOLUTION LD09624
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