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VII. OPTIONS, ACCESSORIES AND CONTROL SEQUENCES
A. FIELD INSTALLED OPTIONS FOR HORIZONTAL AND VERTICAL MODELS
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PO-907BtatsomrehT .V772/V521@A22F°09otF°05egnaRtatsomrehTgnitaeHegatloVeniL
PO-017B
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PO-217B
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PO-317BdrauGtatsomrehT
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PO-417BtiKregnaHepiP .dordedaerhtfodaetsniepipdedaerhtybgniliecmorfdednepsusebottinuwollA
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B. CONTROL SEQUENCES
The following control sequence descriptions are
commonplace for steam/hot water horizontal and
vertical air delivery unit heaters.
1. Intermittent Fan Operation - Intermittent Hot/Cold
Coil
a. When a thermostat calls for heat, the motor is
energized. At the same time, a valve is opened
allowing the heating fl uid to enter the unit heater.
b. Placing an aquastat to the supply or return
piping will prevent motor operation until coil is
properly heated to avoid the delivery of cold air.
c. After thermostat is satisfi ed, motor is de-
energized.
2. Intermittent Fan Operation - Hot Coil
a. When a thermostat calls for heat, the motor is
energized.
b. The heating fl uid is continuously supplied to the
unit heater, even with the motor off.
c. After thermostat is satisfi ed, motor is de-
energized.
3. Continuous Fan Operation - Intermittent Hot/Cold
Coil
a. When a thermostat calls for heat, a valve opens,
allowing the heating fl uid to enter the unit heater.
b. After the thermostat is satisfi ed, the valve closes.
c. The fan runs continuously.
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.oNtraP noitpircseD
10-SMB420HB,810HB:esuFA18.0htiw
20-SMB740HB,330HB:esuFA98.0htiw
30-SMB
950VB,240VB,680HB,360HB:esuFA6.1htiw
40-SMB121HB,801HB:esuFA9.1htiw
50-SMB
590VB,870VB,561HB:esuFA1.3htiw
60-SMB
391HB:esuFA4.3htiw
70-SMB
852HB:esuFA5.4htiw
80-SMB 212VB,391VB,161VB,931VB,043HB,092HB:esuFA5.5htiw
90-SMB
972VB,742VB:esuFA3.7htiw
01-SMB
333VB:esuFA6.01htiw
.oNtraP noitpircseD
10-A7BsedalBresuffiD42-HB/81-HB
20-A7BsedalBresuffiD74-HB/33-HB
30-A7BsedalBresuffiD68-HB/36-HB
40-A7B121-HB/801-HBsedalBresuffiD
50-A7B
391-HB/561-HBsedalBresuffiD
60-A7BsedalBresuffiD852-HB
70-A7B
092-HBsedalBresuffiD
80-A7B
043-HBsedalBresuffiD
C. FIELD INSTALLED OPTIONS FOR
HORIZONTAL MODELS ONLY