Aerovent IM-500 - Manual (Page 13)

13 Aerovent IM-500
Mild Temperature Control
(Aerovent Part #1175-01E)
A mild weather temperature stat is supplied with most
units. The purpose of the mild temperature stat is to shut
the main burner down (100%) during mild weather days
so undesirable temperature build-up in the space will not
occur. This device is normally set at 60 - 65 o F. Adjustable.
Damper Motor
(Aerovent Part #26758-02 or #26758-20)
The damper is operated with a rotary spring return damper
motor capable of 133 in. lbs. of torque. Full opening of the
motor requires 120 seconds. An internal adjustable auxiliary
switch set at 65 o open closes and allows the starter to pull
in and start the fan. On power interrupt the motor is driven
closed by the spring return device.
Start-Up Procedure and Check
List
After the unit has been installed and the preliminary checks
have been made, the following start-up procedure must be
performed.
Regulators are shipped separately (or supplied by oth-
ers) require field adjustment. It is important to check
to make sure that the gas supply pressure to the
unit is in accordance with the input pressure rat-
ing shown on the unit specification description.
CAUTION:
Check gas supply pressure at the unit upstream from the
pressure regulator. Purging air from gas line and piping
should be performed as described in ANSI Z223.1, latest
edition, “National Fuel Gas Code”, or in Canada, CAN/
CGA-B149 Codes. Strainers are recommended to
prevent foreign material from preventing the
safety shut-off valve and blocking valves from
properly seating.
To properly perform the start-up, the following instru-
ments are required.
Test Instruments
Volt Meter (25-460 volt) AC
Amp Meter (0-50 amp)
Ohm Meter
Slack Tube Manometer or 0 - 30" w.c. Pressure Gauge
Hand Held or Strobe-Type Tachometer
1. Turn off power to the unit at the disconnect switch.
Turn all hand gas cocks to the off position.
2. Set the Summer/Off/Winter switch on the Remote
Panel to the “Off ” position and all temperature con-
trol stats to their lowest setting.
3. Check to see that there are no obstructions to the inlet
air supply or the discharge air supply ducts and air
make-up compartments (and return air recirculation
section if supplied).
4. Check to see that all wiring is secure and properly pro-
tected.
5. Recheck belt tension and pulley alignment.
6. Check bearings for proper lubrication.
7. Check to make sure that all filters are in place, and they
are installed properly with arrows pointing in the direc-
tion of air flow.
8. Perform a visual inspection of the unit to make sure
no damage has occurred during installation. Make sure
all service doors have been closed.
9. With the Summer/Off/Winter switch still in the
“Off ” position, energize the electric supply to the unit
with the power disconnect switch.
10. Move the Summer/Off/Winter switch to the
“Summer” position. The inlet and/or discharge air
dampers should open (approximately 120 seconds).
When in the 65% open position, the damper end
switch should make and allow the blower motor starter
to be energized.
Figure 19. Damper Motor
Figure 18. Mild Weather Control