Aerovent IM-500 - Manual (Page 15)

15 Aerovent IM-500
NOTE: RECOMMENDED FREQUENCY OF TEST IS
ONCE PER MONTH.
32. Safety shut off valve leak test. Remove cap from test
cock. Close the manual valve on the vent line. The
main S.S. and blocking valves are closed. Open the test
cock - check for gas leak. If no leak detected close test
cock and cap. Open the manual valve in the vent line.
33. Check gas input rate.
Actual input rate should be checked and necessary
adjustments made after the unit is installed. Over-firing, a
gas pressure result of too high an input, reduces the life of
the unit, increases maintenance, lowers burner efficiency
and can result in poor combustion. Under no circumstance
should the input exceed that shown on the unit specifica-
tion description.
The following procedure describes how the gas input
check is accomplished.
Pressure Method
The pressure method determines input by measuring the
pressure of the gas in the burner manifold in inches of
water. (Designed for 7 in. w.c. MAXIMUM.)
1. Close manual valve.
2. Remove the 1 /
8
" pipe plug test port at the burner and
attach water manometer of “U” tube, which is at least
12" high or pressure gauge calibration with a range of 0
to 15 in. w.c.
3. Open manual valve and start unit.
4. If pressure as indicated by “U” tube or gauge is not
more than 1 /
2
" higher or lower than 7 in. w.c. on the
system spec description, adjust the Maxitrol gas valve
regulator as per the vendor literature that is shipped with
the unit.
If pressure as indicated by “U” tube is more than 1 /
2
"
higher or lower than 7 in. w.c., check the inlet gas pressure
at unit. Adjust main gas regulator to supply the correct gas
inlet pressure as described on the unit’s system specification
description.
Multi-Speed Units
Units with two-speed motors or variable airflow options
require the following additional start-up checks.
Two-Speed Units
1. Check the motor and blower speed at both high and low
speed.
2. Check motor amps at both high and low speed.
Variable Airflow Units
50/50, 60/40, or 70/30 Options
1. Check to make sure that the outside air burner bypass
damper and return air damper operate correctly without
binding.
80/20 Building Pressure Control
1. Check that the outside air burner bypass damper and
return air damper operate correctly without binding.
2. Check to make sure building pressure control is operat-
ing correctly.
The building pressure control is designed to open the
outside air burner by-pass damper and close the return air
damper as the negative pressure in the building increases.
To check if this is occurring, turn on an exhaust fan
and observe the return air damper position. It should start
to close. Turn on additional exhaust fans. The return air
damper should close further.
With all of the exhaust fans running, the return air
damper should be in the fully closed position and the
burner by-pass damper should be in the fully open position.
Check and adjust as necessary.
After all the initial start-up procedures have been
performed, the unit is ready for commissioning. Set the
temperature controls for the recommended control safety
device settings:
1. High gas pressure switch set at 12 in. w.c.
2. Low gas pressure switch set at 2 in. w.c.
3. High temp thermostat 150 o F
4. Low temp thermostat 40 o F
5. Mild weather thermostat set at 65 o F
6. Reset timer 3 min.
7. Room temp. Set point as desired.
8. Airflow switch approx. 2-3 turns from closed position.
9. Building pressure control 0.01 to 0.03 in. w.c.
If the unit is to be left for stand-by operation, set the
Summer/Off/Winter switch to the “Off ” position and
turn the electric power off at the unit’s disconnect switch.
NOTE:
LOSS OF WARRANTY OCCURS IF WARRANTY
START-UP REPORT IS NOT SUBMITTED TO
AEROVENT
Warranty Start-up Report
A Start-Up Report form is included in the back of this
manual. Before turning the unit over to the owner, make
sure the Start-Up Report has been completely filled out,
signed, and dated. Submit a copy of the start-up report
to Aerovent Company, 800 S. High St.., Covington, OH
45318. The fax number is (937) 473-3793.
Operating Sequence
Remote Switch in “Off” Position
With Summer/Off/Winter switch in the “Off ” position
the unit is shut down and either the blower or burner will
operate.