KAH Operation & Maintenance Guide
Page: 35 of 88
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Setting Limits
Temperature
•
Cabinet Panels - 200°F
•
Standard Motors with (Class B Insulation) - 104°F
•
Motors with Class F. Insulation - 140°F
•
Power Wiring - 140°F
•
Controls and Control Wiring - 140°F.
•
Prefilters - 150°F.
•
High Efficiency Filters - 200°F
•
Variable Speed Drive - ABB Mfg. - 140°F
•
Damper and Valve Actuators - 140°F
•
Gasketing - 200°F
•
Gan Bearings - 120°F (FC) , 180°F (AF)
•
Foam - Flash Point - 415°F
•
Energy Recovery Wheels
•
Thermotech - 140°F
•
Innergy tech - 122°F
•
NovelAire® Technologies - 200°F
•
Airxchange® - 170°F
Static Pressure
•
0.5 CFM/ft
2
cabinet at
±
4” wc.
•
Access doors are double walled. Doors are provided
with adjustable door latches and seals.
Checking Motors, Belts and Sheaves
Motors
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 motor
operates at amperage levels above the nameplate limits,
discontinue operation and correct the cause, or refer to
SECTION 3 - MAINTENANCE in this manual.
SECTION 2 - START-UP & OPERATION (CONTINUED)
Belts
Check belts for correct tension at start-up, and again after
24 hours of operation. On multiple belt adjustable 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 unusual for an
adjustable sheave to create damaging vibration 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.
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 Krueger (972.680.9136). Provide the following
information:
»
Drive tag information as shown in Figure 39 on
page 50. 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 current
adjustable driver sheave.
CAUTION -
Do not operate fan motors in overload
amperage conditions. Motors are designed to
operate within the stated Service Factor (SF) on
the motor nameplate.
FIGURE 33 - V-BELT DRIVE KIT LABEL
