Honeywell L7248A,C,L, L7224A,C Wiring, Operation, Replacement Sensor Installation, Fuse, General

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L7224A,C; L7248A,C,L OIL ELECTRONIC AQUASTAT® CONTROLLERS

SENSOR WIRES

BOILER

IMMERSION SENSOR

WELL

HEAT-CONDUCTIVE COMPOUND (OPTIONAL)

M22026

WIRING

WARNING

Electrical Shock Hazard.

Can cause serious injury or death.

Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage.

All wiring must comply with local electrical codes and ordinances. Do not exceed the specifications in the Application section when wiring this control. Use wire rated for 194 °F (90 °C) or higher.

Fig. 4. Replacement sensor installation.

Replacement Sensor Installation

Turn off all power and:

1.

Carefully disconnect sensor from circuit board by

2.

pulling gently on the connector.

Gently pull sensor from thermo well and through cir-

3.

cuit board by pulling on leadwires.

Carefully align replacement sensor with hole in cir-

 

cuit board and guide through Aquastat case and

4.

into well. (See Fig. 5).

Make sure sensor is fully seated to bottom of well

 

(See Fig. 4). Use a small pencil to measure depth of

IMPORTANT

The terminals on these Aquastat Controllers are approved for use with copper wire only.

Follow the appropriate wiring diagrams shown on the inside of the front cover of the L7224A,C; L7248A,C,L or in Fig. 8–13.

Refer to Fig. 6 for Connections for the optional Outdoor Reset Module and the Domestic Hot Water (DHW) module. In subsequent wiring diagrams these modules will be displayed with a dotted line signifying that they are optional.

5.

sensor in well, if necessary.

Connect sensor to circuit board by pressing con-

 

nector on sensor unit into mating connector on cir-

6.

cuit board (See Fig. 5).

For remote sensors (flush-mounted Aquastat Con-

 

trollers) be sure to use 121571AA Clamp (see

 

Accessories) to securely hold sensor in place.

 

THERMOSTAT

ENVIRACOMTM

 

TERMINALS

TERMINALS

 

T

 

 

 

T

3

 

 

 

2

 

 

 

1

DISPLAY

ZR

LINE

 

 

L1

 

 

 

 

 

 

SENSOR

 

T

 

 

T

3

 

 

2

 

 

1

ZR

LINE

 

L1

 

 

L2

 

 

C2

 

 

B2

 

 

C1

 

 

B1

 

 

ZC

 

 

50022037-002

OUTDOOR RESET MODULE

1 2 3 OT OT

C7089U1006

OUTDOOR

SENSOR

50022037-005

DOMESTIC HOT WATER MODULE

1 2 3 TS TS

32003971-003

TEMPERATURE SENSOR

M29651

L2

CONNECTOR

C2

RELAYS

B2

 

C1

SENSOR HOLES

B1

FUSE

 

ZC

 

 

M32187

Fig. 5. Circuit board, showing sensor connection and

well holes for vertical mount models.

Fuse

The 1 Amp fuse located near the transformer is intended to protect the EnviraCOM circuit from incorrect wiring. The Aquastat will continue to function should the fuse blow or be removed though no EnviraCOM communication will be possible on the bus and Err 6 will be displayed. See Table 10.

Fig. 6. Wiring the Outdoor Reset Module and the

Domestic Hot Water Module.

OPERATION

General

The L7224A,C and L7248A,C,L Oil Electronic Aquastat Controllers are primary safety limit-rated devices designed for use with oil fired boilers with line voltage burners and circulators. Many boilers do not include wiring or control compartments as part of the design, but are provided with an integral, replaceable, immersion well that is the mounting hardware for the Aquastat Controllers. Wiring to the other controls is done through flexible metal conduit.

For boilers that do include a remotely (flush) mounted control, the wiring may be completed with conduit or routed behind the boiler sheet metal.

68-0281EFS—05

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Contents Specifications ApplicationDOE Compliance and Operation Environmental RatingsWhen Installing this Product InstallationMounting Flush-Mounted Aquastat Replacement New InstallationWell-Mounted Aquastat Replacement Wiring Replacement Sensor InstallationOperation FuseAdjusting Settings Adjustable FeaturesDisplay DefinitionAnti Short-Cycle Feature OperationHigh Limit Controller Low Limit and Circulator ControllerTroubleshooting CheckoutLine Voltage Indirect Tank Aquastat Time is applied, see Table Zone Request ZR terminal is connected toMinute LED Error Codes Aquastat EnviraCOM Cause/Action AlarmTroubleshooting Guide System Check ActionCondition If no 120 Vac, replace controlSet ELL to On for External Low Limit see If no 120 Vac, check C1-C2 see aboveTH9421C L7248L multizone system with circulator connections Outdoor Domestic HOT Reset Module L7248L External Low Limit connections Automation and Control Solutions Caractéristiques Techniques Caractéristiques électriquesTion HomologationsLors de linstallation du produit MontageNouvelle installation Serrer fermement la vis de lattacheInstallation du capteur de rechange Les modèles à montage horizontalCâblage FonctionnementFusible GénéralAfficheur RéglagesTableau 3. Caractéristiques réglables Fonctionnement Régulateur Limite hauteRégulateur de Limite basse et de circulateur Tableau 4. Définitions de la lecture de laffichageFonction Anti-court cycle ZR Demande deau chaude domestiqueProtection contre le gel Fonctionnement de la purge thermiqueVérification DépannageLimite de température de purge Thermique Taux de chute de température de purgeLe thermostat fait une demande de chaleur Minute ou si le délai de purge thermique tPt a expiréCycles expire une fois la demande en chaleur satisfaite La température de la chaudière dépasse laDiaire de la borne ZR Action Réponse du système Médiaire de la borne ZR Action Réponse du systèmeAlarme Condition liée Système Au diagnostic Vérifier ActionCodes derreur DEL Aquastat Cause/Action EnviraCOMLa chaudière Lafficheur est 120 V c.a. à C1-C2 Est chaude, laPompe Remplacer le régulateurL7224A,C système multizones avec connexions du circulateur Capteur ’EXTÉRIEUR Circulateur L7228l système multizones avec connexions du circulateur ’EXTÉRIEUR Domestique Solutions de régulation et d’automatisation Aplicaciónespecificaciones Cumplimiento y funcionamiento de acuerdo con el DOEClasificación eléctrica Parámetros ambientalesCuando instale este producto InstalaciónMontaje Instalación nueva InstalaciónReemplazo del Aquastat montado a ras Reemplazo del Aquastat montado en cilindroInstalación del sensor de reemplazo Desconecte la energía eléctrica yCableado FuncionamientoPantalla Ajuste de las configuracionesTabla 3. Características regulables Tabla 4. Definiciones de la lectura de la pantalla Funcionamiento Controlador de límite máximoControlador de límite mínimo y circulador Función de ciclo anticortoLocalización Y Solución DE Problemas VerificaciónConfiguración de límite Si corresponde Condiciones de errorÓrdenes de calefacción del TermostatoCondición de error El error desaparece automáticamenteRendimiento del sistema disminuirá Más de 60 segundosEmite una orden de calefacción Máximo Cableado de B1 Err9aReinicio exterior Err 11a 148 EnviraCOM 1, 2, 3, verifique el cableado del sensorTabla 11. Guía de localización y solución de problemas Condición de Sistema Diagnóstico Verificación AcciónSensor Circulador Módulo DE Aquastat DEL Reinicio Exterior Tanque Indirecto ELL=OFF Apagado Panel DE Reproducción Automatización y control desenlace