Blower Adjustment - Heat Controller HKV Installation, Operation & Mainenance Manual

Heat Controller, Inc.
CAUTION!
Always disconnect all power supply(s) to unit prior to
making belt or sheave adjustments. Inadvertently starting
of the motor can cause damage to the equipment and
personal injury.
Airflow and External Static Pressure
Selection Adjustment
The HKV Series is available with standard, low, and high
static options. These options will substitute a different
blower drive sheave for each static range. In addition
certain static ranges may require the optional large fan
motor. Please specify static range and motor horsepower
when ordering. See model nomenclature.
Sheave Adjustment
The HKV Series is supplied with variable sheave drive
on the fan motor to adjust for differing airflows at various
ESP conditions. Select an airflow requirement on the left
side of the table, then move horizontally to right under
the required ESP. Note the sheave turns open, rpm and
horsepower for that condition. Fully closed the sheave
will produce the highest static capability (higher rpm). To
adjust sheave position: loosen belt tension and remove
belt, loosen set screw on variable sheave (on fan motor)
and open sheave to desired position. Retighten set
screw and replace belt and set belt tension as below.
Belt Tensioning
An overly loose belt will, upon motor start, produce a
slippage 'squeel' and cause premature belt failure and
or intermittent airflow. An overly tight belt can cause
premature motor or blower bearing failure.
Belt Tensioning Procedure - HKV
Blower motors for HKV models are slide base mounted.
To adjust the belt tension:
1. Loosen the two (4) bolts that lock the base to the slide
rails.
2. Insert a socket into the opening at the front of the base
assembly.
3. Turn counter clock wise to tighten or clock wise to
loosen the belt.
4. The belt should be tensioned using a tension gauge
method such as the Browning Belt Tensioner to set
proper belt tension (see next page).
5. After belt tension is set secure the (4) locking bolts.
HKV LArge CommerCiAL
Notes:
- Motor position should not need adjustment.
- Motor sheave position is at mid position of each sheave.
Thus the motor sheave is typically 2.5 turns open on a 5
turn sheave.
Special Note for AHRI Testing
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6: All ratings based upon operation at lower voltage
18
All HKV084 ratings @ 2800CFM (1321 l/s)
w/21GPM (1.33 l/s). Sheave setting for ARI is
3.5 turns open.
All HKV096 ratings @ 3200CFM (1510 l/s)
w/24GPM (1.51 l/s). Sheave setting for ARI is
3.0 turns open.
All HKV120 ratings @ 4000CFM (1888 l/s)
w/30GPM (1.89 l/s). Sheave setting for ARI is
2.5 turns open.
Cooling capacities based upon 80.6°F DB,
66.2°F WB entering air temperature.
Heating capacities based upon 68°F DB, 59°F
WB entering air temperature.
of dual voltage rated models.
IOM Instructions

Blower Adjustment