Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
KAH Operation & Maintenance Guide
Page: 6 of 88
BEFORE START-UP
Perform a general inspection. Identify and perform the appropriate the
lock out/tag out and safety rules. Refer to the AHU Start-up Checklist
provided with the information package shipped with the AHU.
For more information about the steps below, refer to the AHU
Installation Guide. For an AHU equipped with a Variable Frequency
Drive (VFD), refer to the specific VFD literature for additional start-up
requirements.
•
Check for damage to the AHU’s interior and exterior.
•
Ensure the terminal screws and wiring connections are secure in
the control, electric and air modulator panels.
•
Verify that the:
»
Equipment was received as ordered.
»
AHU was installed on flat and level surface and with proper
clearances.
»
Condensate drains are properly trapped.
»
All wiring and tubing connections are complete at shipping
splits.
»
All field piping connections are completed.
»
All shipped loose parts are installed.
»
All ductwork is complete and available for full airflow.
»
Installer removed all dirt, debris, hardware, mold, etc. from
interior of the AHU and its ducts.
»
Filter gauge is set to zero.
»
All shipping splits are sealed and secured properly.
»
All shipping bolts and other materials were removed.
•
Ensure clean air filters are installed and secured properly.
•
Inspect all field provided wiring completely.
•
Do not remove the functional bolts from the seismic isolators as
shown in Figure 1 (right).
•
Ensure the damper linkage is tight and is in the correct power
off position.
•
If the return air dampers are closed, loosen the actuator or crank
arm on the jackshaft, open the dampers, and re-tighten the
actuator or crank arm.
•
Verify the following controls installation are complete:
»
Contractor Furnished Controls - Controls contractor is
responsible for safe and proper control of the AHU.
SECTION 2 - START-UP & OPERATION
FIGURE 1 - SEISMIC ISOLATOR
NOTE -
Do not remove the shipping
bolts if there are no springs.
NOTE -
Never use silicone caulk/sealant or caulk/sealant
containing silicone in or on any air handling equipment.
Inspecting Fan Assembly
Use the following instructions to inspect the
fan assembly.
1. When the AHU is removed from long
term storage, purge the moisture-laden
bearing grease, and replenish the AHU
with fresh grease, according to the
lubrication label.
2. Meg the motor to verify that the resistance
is at a satisfactory level, compared to the
value recorded prior to storage.
3. Check the torque for bearings and locking
collars as shown in Table 1 on the next
page.
4. Verify that the fan wheel is properly
aligned, is tight on the shaft, and moves
freely.
5. Make sure the fan bearings are properly
lubricated. Refer to SECTION 3 -
MAINTENANCE in this manual for more
information.
6. Verify that the tie down bolts are removed
from the four corners of the fan base
assembly as shown in Figure 2 on the
next page. For small AHUs, the tie down
bolts may only be applied to three corners
of the fan base since one corner is not
accessible.
