HONEYWELL Controls And HVAC Accessories Manual L0210044

User Manual: HONEYWELL HONEYWELL Controls and HVAC Accessories Manual HONEYWELL Controls and HVAC Accessories Owner's Manual, HONEYWELL Controls and HVAC Accessories installation guides

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Honeywell

L7148F
Electronic
AquastatControlle
APPLICATION

OperatingRelativeHumidity:
0 to95% RH non-conpensing.

The L7148F ElectronicAquastat_ Controller replaces the
functionof the bulb and capillary electromechanical
Aquastat_ with electronictemperature sensingand
microprocessor controlled relays.

ElectricalRatings:
B1-B2:2.0A at 24 Vac,
C1-C2:FullLoad7.4A at 120 Vac;LockedRotor,44.4A
at 120 Vac.

The L7148F ElectronicAquastat@ has an internal high limit
controtlerand is intended for use in gas-firad boilers using
a 24 Vac bumer circuitwith vestibules for a wiring enclosure. The L7148F can replace a Honeywell L4080 HighLimit and R8285 Transformer Relay,

Sen6or:
Thermistor sensor available separately. Lesdwire lengths
available are: 18 in., 24 in. and 36 in. Includesone 114in.
(6 ram) and one 3/16 in. (5 ram) quick connect.
See Table 1.

The L7148F has a 24 Vac bumer output and is used in
gas boilerswhere ignitioncontrolssuch as the Honeywell
$8600 Spark Ignitionor SV9500/SV9501 SmadValve TM
controlsor standing pilotgas controls such as the Honeywell VR8300 are powered from 24 Vac.

Immersion Well:
Available separately. Contact your distributoror Honeywell
sales representativeto order, or refer to Accessories for
Immersion Wells, Compression Fittings, and Element
Holders, form 68-0040,

An external 120 Vac to 24 Vas transformerwith 10 VA
minimumis required to power the L7148F. For total
external transformerVA requirements, add the 10 VA
requirement for the control,gas valve load requirement
(connections B1, B2), zone valve connection requirement
(see zone valve specifications),vent damper requirement
and VA requirementfor any other equipment. Total low
voltage load must not exceed 4A.
The L7148F ElectronicAquastat@ is available with quick
connect or AMP@ plug connections. The 3/16 in. (5 mm)
B1 quick connect and AMP@ plug connections meet ANSI
miswiringrequirements. T, TV and Z terminals are
provided in a terminal block with screw connections.
The complete L7148F system requires a sensor, immersionwell and transformer all of which must be ordered
separately. See Table 1 for sensor specifications.
High Limit Setpolnt Range:
130OFto 2400F (54°C to 116°C).
Dlfferentlah
Fixed 10°F (6°C).
Operating Voltage Range:
L1-L2 Line Voltage Power. Nominal, 120 Vac.
R-C 24V Transformer Ouput: Nominal, 24 Vac.
Minimum/Maximum Ambient Temperature:
-30°F (-9°C) with 2.0A 24V load.
150°F (66°C) with 2.0A 24V load.

AMP@Is a registeredtrademarkofAMP Incorporated.
@U,S.RegisteredTrademark
,<'ix
Copyright(_ 1997 HoneywellInc. • _)
• AllRightsReserved

INSTALLATION
WhenInstallingthisProduct...
1. Read these instructionscarefully. Failureto follow
them could damage the productor cause • hazardous condition.
2. Check the ratingsgiven in the instructionsand on
the product to make sure the product is suitablefor
your application.
3. installermust be a trained, experienced service
technician.
4. After installationIs complete, check out product
operation as provided in these insbuctlons,

WARNING
Can cause property damage, severe Injury
or death.
Use this productonly in systems with a pressure
relief valve.

CAUTION
Can cause electrical shock or equipment
damage.
Disconnect power supplybefore beginningwiring.
Never apply a jumper across (or shod) terminals
B1 and B2. This bums out the transformer,

I[llllllllll[
69-1065B-1

L/148t- _-L*-L,JJ-K.)NI(.;Aquastat_

Table 1. Sensor Spaofflc_ons.
Sensor

TermlnaUon

209659A

one 1/4 in. (6 ram) and
one 3/16 in. (5 ram)
quick connect terminal

Lead Length
36 in. (914 ram)
18-gauge wire

Diameter
3/8 in.
(10 mm)

Capsule Length

Mounting

Material

1-1/4 in. (32 ram)

Compression

"l'nermal
I plastic

209659S

24 in. ( 610 mm),
18-gauge wire

209659C

18 in. (458 ram),
18-gauge wire
IMPORTANT
Do not overtightenthe draw nut or a systemshut.
down could occur.

Mounting
IMPORTANT
The L7148F is not designed for spud mounting to
the sensing well

4. Tighten the draw nut so that the c_ampis firmly
attached to the well and the leadwire is held
securelyin place.
5. Secure excess leedwire to prevent disconnectionof
sensoror removal from the well.

WARNING
Can cause explosion,fire or
systemoverheating.
Sensormustbefullyinsertedtobottomof well.
Sensor and immersionwell are not provided and must be
purchased separately. Mounting screws must be obtained
locally. See Table 1 for sensor specifications.The sensor
is adaptable to existingimmersionwells with a shell I.D. of
3/8 in. (10 ram). To order an immersionwell, contact your
distributoror Honeywell sales representative,or refer to
Accessories for ImmersionWails, Compression Fittings,
and Element Holders, form 68-0040.

- MOUNTING

In new and replacament applications,mount the Electronic
Aquastat@ on the vestibule away from heated surfaces.
Use four no. 6 screws, obtainedlocally, to mount the
control throughthe four mountingholes.
Mount the immersionwell, purchased separately, where
boiler water of average temperature can circulatefreely
around it.
To insert the immersionwell intothe boiler:.
1. Turn off all power and drain the boiler.
2. If no tapping is provided,prepare properlysized and
threaded tapping near the top of the boiler.
3. Coat the well threads sparinglywith pipe dope,
installthe well in ti_ boiler tapping, and tighten
securely.
4. Refill the boiler and check for water leakage.

JAWSOF
CL.*,MP OVER
MOUNTINGFLANGE

IMPORTANT
• Sensor must be fullyinserted to bottom of well or
explosion, fireor system overheatingcan result.
• Remove all heat conductive compound from the
well priorto sensor insertion.

TIGHTEN SCREW AND DRAW NUT
TO SECURE CLAMP

Fig. 1. Secure eansor and leadwtre with
mounting clamp.

5. Insert the sensor into the well. Make sure the sensor
fits securely against the bottom of the well.

Widng

To securesensorand leadwirewithmountingclamp
(see Fig.1):
1. Loosenthedrawnutandspreadthe jawsofthe
ct_mp.
2. Slidethejawsofthe clampoverthe mounting
_ange,
3. Adjustthe sensorleadwiratofit throughthegroove
in the mounting
clamp.

69-1065B-1

M11483

CAUTION
Can cause electricalshock or equipment
damage.
Disconnect
powersupplybeforebeginningwiring,

2

L71_I8F ELECTRONIC Aquastat •

IMPORTANT
• An external transformeris required for operation.
The user must size the transformer for the
specific application.
• If L7148Fis used to power zone valves, totallow
voltage (24V) load must not exceed 4,4. Use a
zoning panel such as the Honeywell R8889 when
load exceeds these ratings.

DISCONNECT

SWITCH

,,x

L7148F

All wiring must comply with local electrical codes and
ordinances, Refer to the specificationsin the Application
section when applyingthis control. For appropriate wiring
diagrams, see Fig. 2 through9.

For screw terminal connections:
1. Strip1/16 in. of insulationfrom
the wire end.
2. Insert the wire under the terminal
screw and contact plate.
3. Usinga standard, fiat-heeded
screwdriver, tighten the screw
untilthe wire is firmly in contact
withthe screw and contact plate.
4. Tighten the screw an additional
one-hafttum.

L1

L2

COM.
C_RCULATOR

HIGH uMrr

BURNER
CONTROL
24V HOT
TO VALVE

DIAL

©

IGNITION
CONTROL

z

/_

T "W

Ml1484

I

For quick connect termina! connections:
Connect the quick connect to the appropriate terminal on
the control B1 and $1 are 3/16 in. (5 ram) quick connect
terminals;all other terminals are 1/4 in. (6 ram).

[
TO BOILER

TO ADVANCED
FEATURE
MOOULE

SENSOR
_

;

For AMF_ plug connections:
Connect the AMP_ plugs to the receptacles on the control.
An AMP_ plug connection is shown in Fig. 7.

COM

The L7148Fand approptiatelysizedextemaltransformer
can poweruptothree HoneywellV8043 ZoneValves.
Additional
valves,in groupsofthreeor less,requirean
additionaltransformer,
or use HoneywellR8889 Zone
ValvePanel.Followthe appropriate
wtdngdiagramswhen
usingzonevalves.See Fig.3 through5 and Fig. 8.
NOTE:

C2

TO THERMOSTAT

OR

=I "E 'DE
24V

//_

F(_VER SUPPLY,PROVIDEDISCONNECTMEANSAND OVERLOAD
PROTECTIONAS REQUIRED.

//_

GROUND MUST BE AN EARTHGROUNDCONNECTION,

./_E1 AND $1 ARE3/16 IN.QUICK CONNECTTERMINALS,ALLOTHER
TERMINALSARE 1/4 IN,
/_C,

COM, Z, B2. G AREALLCONNECI_D INSIOE DEVICE.

/_FOR
EXTERNAL"i_RANSFORMER
VA REQUIREMENTS,REFER TO
APPUCA'RONSECTION.
//_R

On systems requiring a vent damper, the
Honeywell vent damper can be connected
directlyto some L7148F Electronic Aquestat_
models (Fig. 7) or $8610 Spark Ignition Modules
(Fig. 6). With the vent damper plugged into the
Electronic&questerS, a fuse in the Electronic
Aquastat_ blows when the thermostatfirst
closes. Once the fuse is blown, the Electronic
Aquestat® does not operate unlessthe vent
damper is connected. With the vent damper
plugged into the $8610, a fusein the igni_on
module blows when first powered. Once the fuse
is blown, the ignition module does not operate
unlessthe vent damper is connected.

IS A CONVENIENCETERMINAL FOR24V HOTCONNECTION
FOR USE WITH IGN_
_,
ul t*7_

Fig. 2. Extemal connections for L7148F.

3

69-1_5_1

L 7148F ELECTRONIC Aquastate

LIX

DISCONNECT

L7148F

LI G2 L2

[]

OPTIONALVENT
DAMPERPLUG

"COM
BURNER
CONTROL
• 24V HOT

R

TO VALVE OR
IGNITION CONTROL

HIGH LIMFTDIAL

©

z

T IV
$1

$2

TO BOILER
SENSOR

TO ADVANCED
FEATURE
MODULE

L_
COM
/'_

POWERSUPPLY.PROVIOEDISCONNECTMEANS AND OVERLOAD
PROTECi30N AS REQUJRED_

_BI

/_

GROUHOMUST 8E ANEARITt GROUND CONNECTION_

Z_C.

I/_

ADD JUMPER AS SHOWN_

Z_R

II_

FOR EXTERNALTRANSFORMERVA REGUIRF.MENTS_
RF.FERTO
APPUCATIONSECTION_

AND $1 ARE 3/16 iN.QUICK CONNECTTERMINALS.ALLOTHER
TERMINALSARE 1/4 IN.
COM, Z. B2, G AREALL CONNECTEDINSIDE DEVICE.
ISA CONVSNIENCETERMINALFOR 24V HOTCONNECTION
FOR USE _
IGNitION CONTROLS.
M1141r_

Rg. 3. Wldng L7148F with multlzone valves.

69-I065B-1

LI [.2
(HOT)

24V

4

L 7148F ELECTRON/C Aquastat_

T87F

R845

Ittt
OISCONNECT
SWITCH

L24
LOW VOLTAGE
GAS VALVE
_)

HIGH UMIT DIAL

O

TO ADVANCED
FEATURE
MOOULE
/_

POWERSUPPLY.PROVIDEO_SCO_NECTMEANS
AND OVERLOADPROTECllON AS REQUIRED.

•_

GROUNDMUST 8E AN EARTHGROUNDCOI_I_'_ION."

/_B1

AND81 ARE 3/16 IN. QUICK CONNECTTERMINALS.
ALLOII_ER TERMinALS ARE 114IN.

COM

24V

,/_C.
,/_
//_R

COM. _ B2, G AREALLCONNECTED INSIDE DEV1CE*
FOR EXTERNALTRANSFORMERVA REQUIREMENT_
REFERTO APPUCATIONSECTION.
IS A CONVENII_ICE TERMINAL FOR24V HOTCONNECTION
FORUSE _

IGNITIONCONTROLS,

M11477A

Rg. 4. Wldng L7148F In a gas-fired, forced hot water, zoned, pump system.

5

69-106513-1

L7148F ELECTRONIC Aquastato

TO ADDITIONAL R845A
RELAYS FOR OTHER ZONES
L dL

,

R845ARELAyZI_NE1

LOW VOLTAGE
GAS VALVE
(VR8300)
THERMOSTAT

CIRCULATOR
ZONE 1

//_

PO_R SUPPLY.PROVtDIEI_SCONNECT
MEANSAND OVERLOADPROTECTION
AS REQUIRED.

/_

GROUND MUST BE AN EARTHGROUND
CONNECTION,

Z_S1 AND Sl ARE3/16 IN. QUICK CONNECT
T]_RMINALS.ALLOTHER1]ERMINALS
ARE 1/4 JN

INSIDED_ClGE,
REQUIREMEWrS,REFER 1"O
"_TO

ADVANCED
FEATURE

I./_

MO°ULE

Rg. 5. Wlrlng L7148F in mulfi_

69-106513--1

_R

IS A I_NVB_II_'_£
"_RMIN,_. FOR
24V HOT C_E2,1qlNECTION
FOR USE WITH
MI_/,SI^

system with R_

6

switched

clmulat_,

L7148F ELECTRONIC Aquastate

$8610

DISCONNECTswITCHL7148FL1
C2 L2
_

7
CIRCULATOR

HIGH OMIT DIAL

0

/_

POWERSUPPLY.PROVIDEDISCONNECTMEANSANO OVERLOAD
PROTECTIONAS REQUIRED.

AGROUND
//_81
Z

T TV
//_C,
I

//_R

TO BOILER
SENSOR

'r
COM

_r
24V

AND $1 ARE 3116IN, QUtC_
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