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arrow Boiler / DHW Function Comparison

Control Functions

type

256

260

261

262

264

268

265

269

Boiler Operation

 

 

 

 

 

 

 

 

 

Number of Stages

 

1

1

2

2

4

9

3

1

Boiler Differential

 

A/M

A/M

A/M

A/M

A/M

A/M

A/M

 

Boiler Minimum Supply

 

M

M

M

M

M

M

M

 

Boiler Outdoor Reset

 

dot

dot

dot

dot

dot

dot

dot

dot

Boiler Post Purge

 

F

F

M

A/M

A/M

A/M

 

Characterized Heating Curve

 

dot

dot

dot

dot

dot

dot

dot

 

Equal Run Time Rotation

 

 

dot

dot

dot

dot

dot

 

Fire Delay

 

F

M

M

M

M

M

F

 

Fixed Last

 

     

dot

dot

dot

 

Fixed Lead

 

     

dot

dot

   

Heating Curve

 

     

dot

dot

   

Heating Curve Shift

 

M

A/M

M

A/M

M

M

M

A/M

Indoor Temperature Feedback

 

dot

 

dot

     

dot

Interstage Delay

 

 

A

A

A

A

A

A

Lo / Hi Fire Boiler Rotation

 

     

dot

dot

   

Lockout Differential

 

           

dot

Minimum On Time

 

           

dot

PID Staging

 

 

dot

dot

dot

dot

dot

 

Reset Ratio

 

   

dot

       

Soft Start

 

   

dot

       

Starting Water Temperature

 

   

dot

       

Steam Established

 

           

dot

Warm Weather Shut Down (WWSD)

 

dot

dot

dot

dot

dot

dot

dot

dot

Water Temperature Boost

 

A

 

A/M

M

M

M

 

Modulation Operation

 

 

 

 

 

 

 

 

 

0 - 20 mA or 4 - 20 mA Outputs

 

         

dot

 

Minimum and Maximum Modulation Settings

 

         

dot

 

Parallel or Sequential Modulation

 

         

dot

 

Domestic Hot Water (DHW) Operation

 

 

 

 

 

 

 

 

 

DHW Boiler Reset Override

 

dot

 

dot

dot

dot

dot

 

DHW Condensing Boiler

 

dot

 

dot

dot

dot

dot

 

DHW External Demand

 

dot

 

dot

dot

dot

dot

 

DHW Internal Demand (Sensor)

 

   

dot

       

DHW Post Purge

 

dot

 

dot

dot

dot

dot

 

DHW Priority

 

dot

 

dot

dot

dot

dot

 

DHW Setback

 

dot

 

dot

dot

dot

dot

 

Setpoint Operation

 

 

 

 

 

 

 

 

 

Setpoint Boiler Reset Override

 

dot

dot

dot

dot

dot

dot

dot

 

Setpoint Priority

 

dot

dot

dot

dot

dot

dot

dot

 

Protection

 

 

 

 

 

 

 

 

 

Pump Exercising

 

dot

dot

dot

dot

dot

dot

dot

dot

Setback

 

 

 

 

 

 

 

 

 

Timer, 7 Day

 

             

Water Temperature Boost (Indoor Feedback)

 

dot

 

dot

       

Water Temperature Setback

 

dot

dot

dot

dot

dot

dot

dot

 

Zone Temperature Setback

 

dot

 

dot

       

Display

 

 

 

 

 

 

 

 

 

Temperature Display

 

dot

dot

dot

dot

dot

dot

dot

 

Usage Display

 

   

dot

dot

dot

dot

 

Other

 

 

 

 

 

 

 

 

 

120 or 240 V (ac) Rated Relay Outputs

 

dot

dot

dot

dot

dot

dot

dot

dot

Auto Test

 

dot

dot

dot

dot

dot

dot

dot

CSA C US Approved

 

dot

dot

dot

dot

dot

dot

dot

dot

Error Messages

 

dot

dot

dot

dot

dot

dot

dot

dot

Function Indicators

 

dot

dot

dot

dot

dot

dot

dot

dot

Locking Cover Option

 

dot

dot

dot

dot

dot

dot

dot

Plug In System

 

dot

dot

dot

dot

dot

dot

dot

A = Automatic Adjustment, F = Fixed, M = Manual

 

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