Set Point

The Set Point knob specifies the target water temperature in degrees, Fahrenheit. After the water temperature reaches the set point, the temperature control shuts off the burners.

Differential

The Differential specifies the number of degrees below the set point that the control will allow the water temperature to drop before it brings the appliance back on again.

High-Fire Offset

The temperature control operates a two-stage firing system. The two stages are High-Fire and Low-Fire. High-Fire operates all burners while Low-Fire operates approximately one-half of the burners.

The High-Fire knob specifies the number of degrees below set point that the High-Fire stage shuts down. At that point, the appliance will continue to operate at the Low-Fire stage until the set point is reached.

The High-Fire offset knob has settings between 0°F and 20°F. If set at 0°F, the High-Fire offset is disabled and the appliance will operate at the High-Fire stage until the set point is reached and the temperature control shuts the appliance off.

No matter what the High-Fire offset knob is set to, the appliance will light at Low Fire and operate for approximately 10 to 120 seconds before the High-Fire stage actuates.

OUTDOOR AIR RESET OPTION

Outdoor Air Reset Option

For boilers ordered with the Outdoor Air Reset option, there is an additional control (FIG. 6). There are three setting knobs for Shutdown, Outdoor Air Max., and Ratio. There is also a switch to turn the outdoor air shutdown feature On or Off. An O.A. Sensor is also included.

(c)2002 L.C.

 

55

 

 

 

CN1

 

 

 

 

 

CN2

CN3

 

CN7

 

50

60

 

 

 

 

 

 

 

 

OJ1

 

 

 

 

 

 

 

 

 

 

CN8

D4

45

 

65

 

O.A. SENSOR

 

 

 

 

 

CN4

C10

 

 

 

ON ENABLE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VR3

 

 

 

SW1

 

 

 

 

 

 

 

 

 

W1

40

70

 

 

DISABLE

 

 

 

 

 

CN5

OJ2

 

SHUTDOWN

 

O.A. SHUTDOWN

 

 

R6 R4 C7

 

 

 

 

 

 

 

 

 

 

 

 

 

50

55

60

 

0.80.9 1.01.11.2

CN6

C9

 

 

45

 

65

 

0.7

 

 

1.3

 

W3

J4

 

 

 

 

VR1

 

 

0.6

VR2

 

1.4

 

 

R8

 

 

 

40

70

 

 

0.5

1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CN1

 

 

 

 

 

 

W1

W2

 

 

 

O.A. MAX.

 

 

RATIO

 

 

 

 

 

 

 

160

 

 

 

 

 

 

 

CN9

 

 

 

 

 

9

10 11

 

 

 

 

10

 

 

 

200

 

 

 

 

 

 

 

140

 

 

8

 

 

12

 

 

 

5

 

15

 

 

 

 

 

 

13

R15

R16

 

 

 

 

 

220

7

 

 

 

 

 

 

 

 

 

 

 

 

14

 

 

 

 

120

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

5

VR2

15

 

 

(F-)0

VR3

20

 

 

 

 

240

 

 

 

 

 

OFF

DIFFERENTIAL

 

 

 

HIGH-FIRE

 

 

SETPOINT

 

 

TST2314

 

 

 

 

OFFSET

 

FIG. 6 Optional Outdoor Air Reset Control

Shutdown

The Shutdown knob specifies the outdoor air lockout temperature at which the control would prevent the appliance from operating.

Outdoor Air Max (O.A. Max)

The O.A. Max knob allows a reset up to the maximum outdoor air temperature specified by this knob setting. At any outdoor air temperature above the specified setting, the appliance will not reset but will continue to run at the set point temperature.

Ratio

The Ratio knob allows control over the reset ratio to be used during Outdoor Air Reset. The allowable ratios are as low as 0.5:1 or as high as 1.5:1.

Selecting the 0.5:1 ratio will increase the set point 0.5°F for every 1.0°F drop in outdoor air temperature up to the maximum set point temperature.

Selecting the 1.5:1 ratio will increase the set point 1.5°F for every 1.0°F drop in outdoor air temperature up to the maximum set point temperature.

See Figure 7 for an outdoor air reset chart example.

FIG. 7 Outdoor Air Control Example Chart

Outdoor Air Shutdown Enable/Disable Switch

The Outdoor Air Shutdown Enable/Disable switch turns the outdoor air shutdown feature On and Off. Disabling the Outdoor Air Shutdown feature allows the appliance to operate regardless of the outdoor air temperature. This is needed for indirect domestic hot water systems for example.

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Image 7
Lochinvar 150, EB-EWU-02, 000 - 300 installation manual Outdoor AIR Reset Option

000 - 300, 150, EB-EWU-02 specifications

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