Burnham BH Manual Do Utilizador
21
VII. OPTIONS, ACCESSORIES AND CONTROL SEQUENCES
A.
FIELD INSTALLED OPTIONS FOR HORIZONTAL AND VERTICAL MODELS
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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.
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.
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.
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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C.
FIELD INSTALLED OPTIONS FOR
HORIZONTAL MODELS ONLY