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Calibration, Operation Modes, and Control
Table 17. Local heat only with parallel fan present (continued)
Configuration
Local
Fan and On/Off electric
Not applicable
(1 to 3 stages)
Fan and On/Off hot
Not applicable
water (1 to 3 stages)
Fan and Modulating hot
Not applicable
water
On/Off Electric Reheat
The Airflow Setpoint Minimum Local Heat is enforced during reheat.
•
•
•
When reheat is de-energized, the cooling Airflow Minimum Setpoint is enforced. Refer to and .
Hot Water Heat
Two types of control of hydronic heat are supported:
•
52
Remote
Parallel Fan
Parallel Fan
Parallel Fan
Parallel Fan
Stage 1; energizes when the space temperature falls below the active heating setpoint and
minimum airflow requirements are met. When the zone temperature rises above the active heating
setpoint by 0.5°F (0.28°C), stage 1 is de-energized.
Stage 2; energizes when the space temperature is 1°F (0.56°C) or more below the active heating
setpoint, and is de-energized when the space temperature is 0.5°F (0.28°C) below the active
heating setpoint.
Stage 3; energizes when the zone temperature is 2°F (1.11°C) or more below the active heating
setpoint, and de-energizes when the space temperature is 1.5°F (0.83°C) below the active heating
setpoint.
ON/OFF
Method of Control
Stage 1
Local thermostatic:
Local thermostatic:
•
On: Zt < HSP
•
On: Zt <HSP - 1°F
(0.56°C)
•
Off: Zt ≥ HSP + 0.5
°F (0.28°C)
•
Off: Zt ≥ HSP - 0.5°
F (0.28°C)
•
Each stage
•
Each stage represents an equal percentage of
represents an
total capacity.
equal percentage
•
Total capacity is limited by communicated
of total capacity.
supply heat control.
•
Total capacity is
limited by
communicated
supply heat
control.
Local thermostatic:
Local thermostatic:
•
On: Zt < HSP
•
On: Zt <HSP - 1°F
(0.56°C)
•
Off: Zt ≥ HSP + 0.5
•
Off: Zt ≥ HSP - 0.5°
°F (0.28°C)
F (0.28°C)
Total capacity is limited
Total capacity is limited
by communicated
by communicated
supply heat control.
supply heat control.
•
Local PI capacity
•
Local PI capacity loop.
loop.
•
Modulating valve capacity = Total capacity.
•
Modulating valve
•
Valve drive incrementally open/closed.
capacity = Total
•
Total capacity limited by communicated supply
capacity.
heat control.
•
Valve drive
incrementally
open/closed.
•
Total capacity
limited by
communicated
supply heat
control.
Stage 2
Stage 3
Local thermostatic:
•
On: Zt < HSP - 2°F
(1.11°C)
•
Off: Zt ≥ HSP - 1.5°
F (0.83°C)
Not applicable
Not applicable
BAS-SVX091A-EN
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