Honeywell L7224U1002 Guide d'installation télécharger pdf (Page 6)

L7224U OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT

CONTROLLER

69-1720EFS—07 6

220, followed by °F or °C. Pressing the I button again will

display the LL (Low Limit) followed by a three-digit

number and the corresponding degree designator. See

Table 3 for explanation of display readout.

After approximately 60 seconds without any key presses,

the display will enter a dim display mode. To return to the

bright display mode, simply press and release any key.

Display shows local setting; not the setting as modified by an

external enviracom control.

Settings are viewable only if the outdoor reset module and out-

door temperature sensor are installed and functioning properly.

Settings are viewable only if the domestic hot water module

and sensor are installed and functioning properly.

Operation

The L7224U can be in any of four operational states:

Normal, High Limit, Low Limit and Error. The controller

moves back and forth from High Limit to Normal to Low

Limit state as part of normal operation. The operating

states are:

1. Normal: Boiler temperature went below the High

Limit setting (minus the Differential) and has not

exceeded the High Limit setting; or, the boiler tem-

perature went above the Low Limit setting and has

not gone below the Low Limit setting (minus the Dif-

ferential).

2. High Limit: Boiler temperature went above the High

Limit setting and has not dropped below the High

Limit setting (minus the Differential).

3. Low Limit: Boiler temperature went below the Low

Limit setting (minus the Low Limit Differential) and

has not gone above the Low Limit setting.

4. Error: The controller has detected an error condition

(e.g., open sensor) and has shut down the burner

output. The Zone Control (ZC) output is energized.

The controller continues to monitor the system and

automatically restarts if the error condition clears.

Refer to Table 6–8.

The operating sequence for the L7224U is shown in Table

High Limit Controller

The High Limit opens and turns off the burner when the

water temperature reaches the setpoint. The High Limit

automatically resets after the water temperature drops

past the setpoint and through the adjustable Differential.

Low Limit and Circulator Controller

On a temperature rise, the burner circuit breaks and the

circulator circuit makes (assuming no call for heat is

present) at the Low Limit setpoint. On a temperature drop

of 10 °F (6 °C) below the Low Limit setpoint (with the

adjustable Differential at the minimum setting of 10 °F

(6 °C)), the burner circuit makes and the circulator circuit

breaks. Refer to Fig. 7.

Fig. 7. Setpoints and differentials.

Table 3. Display readout definitions.

Text Description Display

Err Error Code (if one is present)



bT Boiler Temperature



High Limit



HdF High limit differential



LL Low Limit set-point (L7224 only)



Ldf Low Limit differential (L7224 only)



tt Local Thermostat Status



ttE EnviraCOM Thermostat Status



brn B1 (Burner) output (ON or OFF)



Cir C1 (Circulator) output (ON or OFF)



ZC ZC (Zone Control) output (ON or OFF)



Zr ZR (Zone Request) Call for HEAT (ON or OFF)



duu ZR Configured as Domestic Hot Water

Request (L7224, L7248L only)



ASC Anti Short-Cycle Timeout



bSP

Boiler Set-Point



dhc

DHW Module Connected

(YES or NO)



Outdoor Temperature



otL

Outdoor Temperature Low



otH

Outdoor Temperature High



btL

Boiler Temperature Low



Boost Period



Boost Step



UUS

Warm Weather Shutdown Temperature



LOW LIMIT

SETTING

HIGH LIMIT

SETTING

SWITCH BREAKS ON

TEMPERATURE RISE.

BURNER TURNS OFF.

CIRCULATOR OPERATES

ON A CALL FOR HEAT.

SWITCH MAKES ON

TEMPERATURE FALL.

BURNER OPERATES ON A

CALL FOR HEAT.

WITH NO HEATING

DEMAND, SWITCH BREAKS

ON TEMPERATURE RISE.

SWITCH MAKES ON

TEMPERATURE FALL,

BURNER IS ON TO

MAINTAIN MINIMUM

WATER TEMPERATURE.

CIRCULATOR IS OFF.

M23365

WHEN WATER REACHES LOW LIMIT SETTING, THE BURNER SHUTS

OFF OR THE CIRCULATOR PUMP STARTS (WHEN CALLING FOR HEAT).

10ºF (6ºC)

DIFFERENCE

10ºF (6ºC)

DIFFERENCE

1 2 3 4 5 6 7 8 9 10 11 ... 51 52

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Honeywell L7224U1002 Guide d'installation Page 6

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