Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
KAH Operation & Maintenance Guide
Page: 8 of 88
START-UP
It is recommended that the start-up technician use the
AHU Start-up Checklist, included with the AHU, and record
the gathered information in the appropriate fields. If there
are questions, refer to Table 15 on page 58 for inspection
requirements.
Install the provided or temporary filter media prior to start-
up to adequately protect the components in the air stream
and duct system.
If the AHU is equipped with an energy recovery wheel,
rotate the wheel when the AHU is in service to prevent
clogging.
Checking Operation of Fans
Check of the operation of the fans by:
1. Verifying the correct voltage, phase and cycles.
2. Energizing the power to the AHU disconnect switch.
3. Energizing the fan motor(s), briefly (bump) and check
for correct fan rotation.
If the fan rotation is incorrect:
1. On three-phase equipment, reverse any two motor
leads at the load side of the last starter component.
2. On single-phase equipment, follow the wiring diagram
on the motor housing or on the inside of the motor
terminal box.
3. Recheck for correct fan rotation.
SECTION 2 - START-UP & OPERATION (CONTINUED)
FIGURE 4 - COUNTERBALANCE LOCKED INTO
PLACE FOR SHIPPING
FIGURE 5 - COUNTERBALANCE UNLOCKED FOR
START-UP
CAUTION -
Do not be operate this AHU until
after start-up is completed as outlined in these
instructions. Do not allow the AHU to run on
unreliable temporary power, which could turn the
AHU on/off periodically or rapidly, and to protect
it from irregular voltages and surges.
CAUTION -
Most units are shipped with dampers
in closed position. Release and adjustment is to
be done by field technician only.
Back Draft Dampers for Dual Fans
The counterbalance is locked into place for shipping
as shown in Figure 5 on page 18. Before startup, the
counterbalance will have to be released. To do this, loosen
the set screws and slide the counterbalance off the end
of the shaft. Flip the counterbalance and slide it back on
the shaft. Rotate the counterbalance above the damper
as shown in Figure 6 on page 18, and then tighten the set
screws. The counterbalance should be free to rotate.
Checking Operation of Dampers
Make sure the AHU will not operate with all dampers
closed.
Linkage design and/or damper linkage is optional. Airflow
control dampers may be operated with pneumatic or
electric actuator/controllers.
Prior to occupancy, test the ventilation system to
ensure that the outdoor air dampers operate properly in
accordance with the system design.