Honeywell L7224U1002 Guide d'installation télécharger pdf (Page 9)

L7224U OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT

CONTROLLER

9 69-1720EFS—07

Table 5. L7224/L7248 Controller Operating Sequence.

* Error condition only available when the Outdoor Reset

Module is installed.

Action System Response

Thermostat

calls for heat.

Circulator starts when water temperature is

above Low Limit setting (if applicable) or above

the Thermal Purge Temperature Limit (tPL) if

Thermal Purge is enabled. Boiler temperature

is checked. Burner starts when water

temperature is below High Limit setting minus

the differential or at or below the Thermal

Purge Temperature Limit (tPL) for cold start

boilers if the Thermal Purge Temperature Limit

is enabled. If tPL is enabled, the burner may

also start if the boiler temperature is cooling at

10 ºF or greater per minute or the Thermal

Purge Time Delay (tPt) has expired.

If Anti Short-Cycle Time is enabled, the burner

does not start until the set Anti Short-Cycle

Time between cycles expires after the previous

call for heat was satisfied.

Boiler

temperature

exceeds the

High Limit.

Burner is turned off. Burner restarts when the

water temperature drops below the High Limit

setting minus the Differential. If Thermal Purge

is enabled, the burner is turned on when either

the Thermal Purge Temperature Limit is

reached, the Thermal Purge Time Delay has

expired or the boiler temperature cooling rate

exceeds 10 ºF/minute.

Thermostat is

satisfied.

Circulator and burner turn off.

Boiler

temperature

drops below

the Low Limit

setting minus

the differential

(if applicable).

Burner is turned on, Circulator is turned off.

Burner stops when the water temperature

exceeds the Low Limit setting. Power to Zc is

removed.

Error

conditions

1-5.

If an error condition is detected, all outputs

except ZC are shut down. Burner is off. The

controller continues to function and restarts

when error is corrected.

During the error check sequence, the system

checks for drift in the sensor and corrosion in

the connections.

Error

condition 6.

EnviraCOM communication is not available.

Error

condition 7.

The controller has reset the High Limit, Low

Limit and Differential Setting to a default setting

and will continue to run at those settings.

Performance of the system will be degraded.

Error

condition 8.

If the error condition is detected, all outputs

except ZC are shut down. Burner is off.The

controller continues to function and restarts

when all three user keys have been pressed

longer than 60 seconds.

Error

condition 9*.

System continues to run with no outdoor reset

functionality

Error

condition

10*.

System continues to run with outdoor reset

parameters enabled as programmed. Error

cleared automatically.

Error

condition 11*.

System continues to run with boiler temp set to

High Limit.

Table 6. L7224 Controller Operating Sequence with mul-

tiple zones connected through the ZR terminal

Action System Response

Zone Request (ZR)

terminal is connected

to L1 (Zone calls for

heat).

Boiler temperature is checked. Burner

starts when water temperature is below

High Limit setting or at or below the

Thermal Purge Temperature Limit (tPL) for

cold start boilers if the Thermal Purge

Temperature Limit is enabled. If tPL is

enabled, the burner may also start if the

boiler temperature is cooling at 10 ºF or

greater per minute or the Thermal Purge

Time Delay (tPt) has expired. Anti Short-

Cycle Time is applied, see Table 5.

Boiler temperature

exceeds the High

Limit.

Burner is turned off. Burner restarts when

the water temperature drops below the

High Limit setting minus the Differential. If

Thermal Purge is enabled, the burner is

turned on when either the Thermal Purge

Temperature Limit is reached, the Thermal

Purge Time Delay has expired or the boiler

temperature cooling rate exceeds 10 ºF/

minute.

Zone Request input is

de-energized (Zones

are satisfied).

Burner turns off.

Boiler temperature

drops below the Low

Limit setting minus

the differential (if

applicable).

Burner turns on and Zone Control is de-

energized. Burner turns off and Zone

Control is re-energized when the water

temperature exceeds the Low Limit setting.

Table 7. Controller Operating Sequence with External

Low Limit device connected trough the ZR terminal.

Action System Response

Zone Request (ZR)

terminal is connected

to L1 (External Low

Limit call for heat).

Boiler temperature is checked. Burner

starts when water temperature is below

High Limit setting. Circulator turns off.

Boiler temperature

exceeds the High

Limit.

Burner is turned off. Burner restarts

when the water temperature drops

below the High Limit setting minus the

Differential.

Zone Request input is

de-energized (External

Low Limit is satisfied).

Burner is turned off.

Table 8. L7224 Controller Operating Sequence with

Domestic Hot Water connected trough the ZR terminal.

Action System Response

Zone Request (ZR) terminal

is connected to L1

(Domestic Hot Water calls

for heat).

Boiler temperature is checked. Burner

starts when water temperature is

below High Limit setting.

Boiler temperature exceeds

the High Limit.

Burner is turned off. Burner restarts

when the water temperature drops

below the High Limit setting minus

the Differential.

Zone Request input is de-

energized (Domestic Hot

Water is satisfied).

Burner is turned off.

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Honeywell L7224U1002 Guide d'installation Page 9

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