PUSH SELECT

RATIO – Sets the desired change in system water temperature increases as the outdoor temperature decreases. The reset ratio is expressed as follows:

2:1 for every 2 degree change in outdoor temperature the sytem temperature will change 1 degree.

 

 

Temperature °F

e.g: Set = 135°F

Ratio

Outdoor

System

 

2:1

60

140

 

 

40

150

 

 

20

160

Suggested Guidelines

 

 

Typical

Reset Ratio Setpoint at Design Temp:

 

 

 

 

 

 

 

 

RADIATION

Temp@

 

Temp@

 

 

 

 

Design Cond

 

70°F

40°F

20°F

0°F

-20°F

 

 

 

 

 

 

 

 

Standing

190

 

105

0.3:1

0.6:1

0.8:1

1.1:1

Convection or

 

 

 

 

 

 

 

Baseboard

200

 

105

0.3:1

0.5:1

0.7:1

0.9:1

 

 

 

 

 

 

 

 

Fan Coil - Heating

190

 

105

0.3:1

0.6:1

0.8:1

1.1:1

 

 

 

 

 

 

 

 

Fan Coil - Heat & Cool

140

 

105

0.9:1

1.4:1

2.0:1

2.6:1

 

 

 

 

 

 

 

 

Radiant Floor

120

 

105

2.0:1

3.3:1

4.7:1

6.0:1

 

 

 

 

 

 

 

 

Radiant Ceiling

120

 

105

2.0:1

3.3:1

4.7:1

6.0:1

 

 

 

 

 

 

 

 

SUGGESTED GUIDELINES

The selection of the correct ratio is dependent on the initial temperature and the desired system water temperature setpoint and the design temperature conditions.

The reset ratio and setpoint must be selected so that the controller will raise the system water temperature from the initial setpoint – suggested 110°F – to the maximum temperature required when the outdoor temperature drops from 70°F to the design temperature.

PUSH SELECT

Design temperature rise of the system related to the boiler. Default value 20°F.

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Raypak B6000 manual Push Select, Temperature F, Set = 135F Ratio Outdoor System 140 150 160, Suggested Guidelines

B6000 specifications

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