4
Condensate Drain Trap
(Air Seal)
1 1/4” Pipe Drain
Start-Up
Make sure all bolts and screws are tight.
Remove tagged shipping tie-down bolts and spacers
from the fan and motor assembly before start-up.
(Internally isolated units only.)
Check the sheaves to see if they are alignment and
make suer the set screws are tight. Make sure that
the dimension across the top is equal on all grooves,
otherwise excessive belt wear will result.
Check for proper rotation of the blower pulley. Three
phase motor rotation can be reversed by exchanging
two of the three leads at the motor starter. The rotation
of single phase motors can be reversed by exchanging
leads inside the motor junction box. (See motor wiring
diagram.)
Check the amperage draw of the motor. This should not
exceed the nameplate amps shown on the motor serial
plate.
After approximately two weeks of operation, the belts
will have nearly acquired their permanent stretch. After
this interval, the belt tension should be checked again
and proper adjustment made.
Maintenance
The belt tension should be checked at three month
intervals.
The fan shaft bearings on Sizes 03, 06, 08, 10, and
12 with low pressure forward curved fans have lifetime
lubricated bearings. All other units have ball bearings
which can be relubricated. These bearings mounted
inside the fan section have extended lubrication lines
which are mounted on the outside of the fan panels.
The suggested greasing intervals indicated in a sticker
attached to the unit.
It is recommended that bearings be lubricated with a
high quality lithium grease at intervals indicated on
sticker attached to the unit.
Instructions are included on the motor nameplate for
lubricating the motor bearings.
The filter should be periodically inspected and replaced
or cleaned when necessary. Dirt filters reduce the sir
flow which reduces the capacity of the system.
Do not operate system without filters.
Condensate Drain Traps
The condensate drain trap piping must be properly
designed to insure the removal of condensate. Incorrect
trapping can hold water in pan causing overflow. On
blow-thru units, particular, system air can escape down
the drain with incorrect trapping.
(a) On draw-thru units (A) shall be equal to or
greater the coils section’s negative pressure at
operating conditions.
(b) On blow-thru units (A) can be as small as 1” but
(B) must equal or exceed the total static pressure
in the coil section.
Internally Isolated Units
Sizes 03-41 which have optional internal spring isolation
have four hold-down shipping braces. Remove the 1/2”
bolt between each shipping brace and the motor base,
then loosen the bolt to the frame and slide the brace to
the end of the slot so that the brace is 5/8” from motor
support base. Re-tighten the bolt so that the shipping
brace acts as a snubber on fan start up.