Sequence Of Operations - Manitowoc Cleveland SGL-30-T1 Manuel De L'opérateur

SEQUENCE OF OPERATIONS

When using these instructions refer to the SGL-TI wiring
schematic.
1. 115 VAC is sent through the 3 amp fuse to
I The primary of the 24 VAC transformer
24 VAC is sent from the secondary of the
24VAC transformer to the Hi/Off/Low Switch.
I Contacts of the RI Blower Relay
I The optional Power Tilt Circuit
2. With the Hi/Off/Low switch in the Low position.
I 24 VAC is sent through the normally closed high
limit switch to the mercury switch.
I If the unit is in the down position then 24 VAC is
sent through mercury switch to pin 9 on the
thermostat.
3. With the Hi/Off/Low Switch in the Hi position 24
VAC is also sent to the Hi terminal on the gas
valve.
I Gas will not leave the valve until the main gas
valve opens (see step 7).
4. If the steamer is calling for heat the 24 VAC is sent
from pin number 10 to R1 Blower Relay.
I The normally open contacts of the blower relay
close sending 115 VAC to the blower.
I The blower turns closing the air switch.
I 24 VAC is sent through the now closed air switch
to the ignition module.
5. Ignition module sends spark from terminal SP to
the igniter.
6. Ignition module also sends 24 VAC from pins PV
and MV/PV to the pilot coil of the gas valve pins P
and C.
I Pilot valve opens sending gas to the Pilot
assembly.
I Spark and gas meet and pilot is ignited.
I AC current is passed through the flame and
rectified then sent back to the ignition module.
7. If the ignition module reads a minimum of 1.0
micro-amps through the burner ground then 24
VAC is sent from pins MV and MV/PV of the ignition
module to pins M and C on the Gas valve.
I The main (low) gas valve opens and gas (3.0"
W.C. natural gas or 8.0" W.C. LP) is sent to the
burner.
I If the unit is in the Hi position (see step 3) 24VAC
will be at the HI terminal and the gas pressure will
be 3.5" W.C. natural or 10.0" W.C. LP.
I Burner ignites until thermostat is satisfied.
8. When thermostat is satisfied, 24 VAC is removed
from pin 10 on the thermostat and the heat circuit
is de-energized
9. If the unit has the optional Power Tilt option and is
in the down position, 115 VAC is sent from the
customer connect through the circuit breaker and
the up limit switch to the tilt switch.
10. With the tilt switch in switch in the Up position
I 115 VAC is sent to the Bridge Rectifier
115 VDC is sent from the rectifier through the
30-ohm resistor to the normally open RY10
and RY11 relay contacts.
I 115 VAC is sent to the RY 10 relay coil.
I The normally open RY10 contact close and 90
VDC is sent to the DC motor
I The DC motor is energized and the unit tilts until
the switch is released or the up limit switch opens.
11. With the Tilt switch in the Down position
I 115 VAC is sent to the Bridge Rectifier
115 DC is sent from the rectifier through the
30-ohm resistor to the normally open RY10
and RY11 relay contacts.
I 115 VAC is sent to the RY 11 relay coil.
I The normally open RY 11 contact close and the
polarity of the 90 VDC is reversed.
I The DC motor is energized and the unit lowers
until the switch is released or the Down limit switch
opens.