Start-Up Procedure; Controls Locations; Important - Modine MDB Série Manuel D'installation Et De Maintenance

start-uP Procedure

controls locations

caution
1. Do not operate unit with a gas input rate greater than that
shown on the unit's rating plate.
2. Purging of air from gas supply lines should be performed
as described in ANSI Z223.1 - latest edition "National Fuel
Gas Code", or in Canada in CAN/CGA-B149 codes.

imPortant

Start-up and adjustment procedures should be performed
by a qualified service agency.
To properly perform the start-up, the following instruments are
required.
Volt Meter (25-600 volt)
Amp Meter (0-100 amp)
Micro-Amp Meter (0-20 mAmp)
Ohm Meter
Gas Pressure Gauge (Range dependent on inlet pressure
to unit)
Slack Tube Manometer, or 0-30" w.c. Pressure Gauge
Inclined Manometer (0-5" w.c.)
Hand Held Tachometer (contact, reflective, or strobe type)
after the unit has been installed and the preliminary
checks have been made, the following start-up must be
performed.
1. Turn off all power to the unit. Turn all hand gas valves to
the closed position.
2. Set the optional Summer/Off/Winter switch on the remote
control panel to the "Off" position, and set all stats to their
lowest settings.
3. Check to see that there are no obstructions to the inlet air
supply or the discharge air supply ducts (and return air unit
openings).
4. Check to see that all wiring is secure and properly
connected and protected.
5. Recheck belt tension and pulley alignment. (See Page 21)
6. Check bearings for proper lubrication. (If the unit has
been supplied with spider bearings, the bearings are
permanently lubricated and do not require additional
lubrication.)
7. Check to make sure that all air filters are in place, and that
they are installed properly according to direction 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 replaced and/or closed.
9. With the optional Summer/Off/Winter switch still in the "Off"
position, turn on the electric supply to the unit.
10. Move the optional Summer/Off/Winter switch to the
"Summer" position. The inlet and/or discharge outside air
damper (if supplied) should open. When they are in the full
open position, the damper motor end switch should make
and allow the blower motor to operate.
11. Check to make sure that the inlet and/or discharge damper
(if supplied) opens properly without binding.
12. Check the blower for proper direction of rotation.
18
13. Check the blower speed (rpm). For units equipped with
a VFD, blower speed should be checked at both high
and low speeds. (See page 21 for motor and blower
adjustment).
14. Check the motor speed (rpm). For units equipped with a
VFD, motor speed should be checked at both high and
low speeds.
15. Check the motor voltage (for units equipped with a VFD,
the voltage should be checked at high speed). On three
phase systems, check to make sure all legs are in
balance.
16. Check the motor amp draw (for units equipped with a
VFD, the amp draw should be checked at high speed)
to make sure it does not exceed the motor nameplate
rating. If the motor amps are too high, it could be a result
of the system static pressure being lower than designed,
resulting in excessive airflow. Excessive airflow can cause
the fan motor protection to trip on overload, can result in
decreased air temperature rise or may not allow the burner
to fire because of an open high airflow cutout switch
(PS-11), or can consume excessive energy. Air volume
measurement and adjustment will be necessary.
17. Measure the unit air volume being delivered and compare
to the rated air volume on the unit serial plate. If the
measured air volume does not match, adjust the fan RPM
by adjusting the sheave on the motor (as described in the
"Blower/Motor Adjustment" section on page 21.)
18. Recheck the gas supply pressure by installing a gas
pressure gauge connected to the inlet gas pressure test
port. See Figure 9.1 trough 9.4 on page 9 to locate the
inlet gas pressure test port. Refer to rating plate for proper
gas supply pressure to unit. If inlet gas pressure exceeds
the maximum pressure specified on the rating plate, a gas
pressure regulator must be added upstream of the factory
furnished and piped components.
Refer to the heater rating plate for determining the
minimum gas supply pressure for obtaining the maximum
gas capacity for which this heater is specified.
19. Check pilot and pilot ignition. For this step, open the pilot
gas hand valve only.
20. Check to make sure that all manual reset safety devices
have been reset to their normal operating position.
note: If high and/or low gas pressure switches have been
supplied, the first main gas hand valve will also have to be
opened at this time. However, the second main gas hand
valve located before the modulating gas valve should be
kept in the closed position.
21. Set the Summer/Off/Winter switch to the "Winter" position
and move the temperature controls to call for heat.
note: If a mild temperature inlet On/Off stat has been
supplied the set point of the stat may have to be adjusted
to allow initiation of the pilot ignition sequence. If this is
necessary, raise the set point of the inlet stat.
22. Check to see that the pilot lights properly.
The spark ignitor should begin to spark in approximately
10 seconds, and the pilot flame should be established
within 10 seconds.
7-500.10