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Edge [ii] Controller Operation Manual

SECTION 6 – ADVANCED SETUP

OMM-139_E • 8/25/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 134 of 196

• SH & DHW Proportional Band: Generates a fire rate based on the error that

exists between the setpoint temperature and the actual outlet temperature. If the

difference is less than the value of these parameters, the fire rate will be less than

100%. If the error is equal to or greater than the value of these parameters, the fire

rate will be 100%. (Range: 1°F to 120°F)

• SH & DHW Integral Band: Specifies the fraction of the output, due to setpoint

error, to add or subtract from the output each minute to move towards the setpoint.

(Range: 0.00 to 2.00)

• SH & DHW Derivative Band: This value responds to the rate of change of the

setpoint error. This is the time that this action advances the output.

(Range: 0.0 to 2.0 min.)

• Cascade Deadband Hi & Lo: These parameters define a temperature range

within which the plant Outlet Temperature can drift above and below the Setpoint.

(Range: 0 to 25°F)

• SH, DHW, Other, Other SH PRI & Other DHW PRI Hi Limit (the options that

appear depend on the Application chosen in Section 6.3.3: BST Application

Configuration): The highest temperature for each Application the plant will meet.

(Range: 40 to 210°F)

Valve Configuration

The Valve Configuration screen contains parameters necessary for communicating with and

controlling the external sequencing valves on the boilers in a BST cascade.

NOTE:

This screen is available only after BST Cascade functionality has been enabled (see the

Unit Mode parameter in Section 6.3.1: Cascade Configuration). If the unit is configured as

a BST Manager, the parameters apply to this unit and all BST Client units. If the unit is

configured as a BST Client, the parameters configured on the BST Manager will take

precedence.

1. Go to: Main Menu → Advanced Setup → BST Cascade → Operating Controls → Valve

Configuration.

SELECT OUTPUT = CASCADE VALVE SELECT OUTPUT = Aout 2

Figure 6.3.4.4: Operating Controls: Valve Configuration Screen

Watts AERCO Edge [ii] User Manual

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