Comfort-Aire HKV300A - Manual (Page 24)

Installation, Operation & Maintenance HKV SERIES Heat Controller, LLC
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The HKV Series is available with standard, low, and high static op-
tions. These options will substitute a different blower drive sheave
for each static range. In addition
certain static ranges (bold print in Tables 5a through 5k) may re-
quire the optional large fan motor. Please specify static range and
motor horsepower when ordering. See model nomenclature.
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The HKV Series is supplied with variable sheave drive on the
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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
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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 as-
sembly.
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 ten-
sion (see next page).
5. After belt tension is set secure the (4) locking bolts.
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: All HKV084 ratings @ 2800CFM (1321 l/s) w/21GPM
(1.33 l/s). Sheave setting for AHRI is 3.5 turns open.
Note 2: All HKV096 ratings @ 3200CFM (1510 l/s) w/24GPM
(1.51 l/s). Sheave setting for AHRI is 3.0 turns open.
Note 3: All HKV120 ratings @ 4000CFM (1888 l/s) w/30GPM
(1.89 l/s). Sheave setting for AHRI is 2.5 turns open.
Note 4: Cooling capacities based upon 80.6°F DB, 66.2°F WB
entering air temperature.
Note 5: Heating capacities based upon 68°F DB, 59°F WB
entering air temperature.
Note 6: All ratings based upon operation at lower voltage of
dual voltage rated models.
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Always disconnect all power supply(s) to unit prior to making
belt or sheave adjustments. Inadvertently starting of the mo-
tor can cause damage to the equipment and personal injury.
CAUTION!
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