Honeywell TRIPLEAQUASTAT L8151A User Manual

L8151A  
TripleAquastat® Relay  
The L8151A is a remote bulb controller for use  
with hydronic heating systems that include domes-  
tic hot water service.  
Provides high limit, low limit, and circulator control  
Shielded capillary allows convenient mounting.  
for maintaining boiler temperatures.  
Consistsofadiaphragmpowerheadandmicroswitch  
assembly that responds to temperature changes in  
the boiler water.  
Can provide multizone control by using a separate  
thermostat and R845 Relay for each zone.  
An internal transformer powers the thermostat cir-  
cuit.  
CONTENTS  
Specifications ................................................. 2  
Ordering Information ..................................... 2  
Installation ..................................................... 2  
Operation and Settings................................... 5  
Checkout......................................................... 6  
J. H. • Rev. 1-95 • ©Honeywell Inc. 1995 • Form Number60-2553
L8151A  
INSTALLATION  
IMMERSION WELL MOUNTING  
CAUTION  
NOTE:Immersionwellmustbeorderedseparately.Foralist  
of available wells, refer to form 68-0040, Wells and  
Fittings for Temperature Controllers.  
• Disconnect power supply before beginning in-  
stallation to prevent electrical shock or equip-  
ment damage.  
• Avoid making sharp bends or kinks in the capil-  
lary. Bends should be no less than 1 in. (25 mm).  
The boiler manufacturer generally provides a tapping  
for the immersion well. This tapping should be located at a  
point where typical water temperature can be measured.  
The immersion well must never be located close to a hot or  
cold water inlet or a steam coil, or where the pressure  
exceeds 200 psi (1380 kPa).  
IMPORTANT: Terminals on these Aquastat® Relays are  
approved for copper wire only.  
If the system is filled, drain to a point below the selected  
installation location.  
Fig. 1—Approximate L8151 dimensions in in.  
(mm).  
1/8  
(3)  
Fig 2— Internal view of L8151.  
2-3/16  
(56)  
VOLTAGE BARRIER  
GROUNDING SCREW  
TRANSFORMER  
FOR THERMOSTAT  
CIRCUIT  
1-7/16  
(37)  
1-1/2  
(38)  
13/64 X 21/64 (4)  
DIFFERENTIAL  
SETTING  
CAPILLARY  
30 IN. (762)  
6-1/8  
(156)  
CIRCULATOR  
RELAY  
4-1/2  
(114)  
LOW LIMIT SETTING  
4-5/16 (110)  
4-23/32 (120)  
M8893  
HIGH LIMIT SETTING  
1-1/4  
(32)  
KNOCKOUT  
FOR 1/2 IN.  
CONDUIT (5)  
1-1/4  
(32)  
13/16  
(21)  
3-5/16  
(84)  
1. Screw the well into the boiler, tank, or pipe tapping.  
2-3/6  
(56)  
2. Insert the bulb into the well, pushing tubing until bulb  
bottoms in well. Avoid making sharp bends or kinks in the  
capillary. Bends should be no sharper than 1 in. (25 mm)  
radius.  
M8892  
3. Attach the retainer clamp to end of well spud. Loosen  
draw nut and spread jaws of clamp with screwdriver if  
necessary, Fig. 3.  
MOUNTING THE CASE  
Mount the case in a convenient location near the boiler.  
Remember that the shielded capillary must reach from the  
case to the immersion well. This maximum ambient tem-  
perature of the selected location must not exceed 150°F  
(66°C) at the case, 265°F (130°C) at the sensing element.  
3
60-2553—3  
L8151A  
INSTALLATION  
All wiring must comply with local electrical codes and  
ordinances. The limits given in the Specifications section  
must not be exceeded when applying this control. Use  
manufacturer instructions when wiring controlled equip-  
ment or refer to typical hookups in Fig. 4 through 6.  
When the B1 terminal on the device being replaced is  
1/4 in. tab terminal, use the existing wiring harness termi-  
nals to install the replacement device. When the B1 termi-  
nal on the device being replaced is a screw terminal, insert  
the provided tab terminal to screw terminal adapter on the  
1/4 in. tab terminal of the replacment device. After the  
adapter is installed, the existing wraparound wire end can  
be reused to make an electrical connection to the B1 termi-  
nal.  
Fig. 3—Remote bulb installation.  
JAWS  
SPREAD JAWS  
TO FIT OVER  
RIDGE ON SPUD  
OF WELL  
SCREWDRIVER  
INSERT— MOUNTING CLAMP  
DRAW  
NUT  
MOUNTING  
CLAMP  
NOTE: Do not use a push type ratchet screwdriver.  
SPUD  
WELL  
BULB  
B
1. Strip 7/16 in. of insulation from the wire end.  
2. Wrap the wire at least three-fourths of the distance  
around the screw as shown.  
3. Using a standard, flat-headed screwdriver, tighten the  
screw until the wire is snugly in contact with the screw and  
contact plate.  
TUBING  
M8777  
A
4. Tighten the screw an additional one-half turn.  
4. With part no.121371AA Retainer Clamp attached to  
well spud (be sure jaws of clamp hook over ridge at end of  
spud, as shown at points A), adjust tubing to fit through  
retainer clamp groove, as shown at point B.  
5. Tighten draw nut so that retainer clamp is firmly  
attached to well spud and tubing is held securely in place. Be  
careful not to damage the capillary.  
Fig. 4—Typical hookup for L8151A in a single  
zone system.  
LOW VOLTAGE  
THERMOSTAT  
T
THERM.  
T
6. Carefully coil the excess capillary at the bottom of the  
Aquastat® case.  
ZC  
WIRING  
X
X
ZR  
OIL BURNER  
RELAY  
LINE TERMINAL  
2
CAUTION  
3
1
X
X
B1  
• Disconnectpowersupplybeforewiringtoavoid  
electrical shock or equipment damage.  
OR  
BURNER  
X
X
B2  
• Be sure the terminal connections are inside an  
enclosure that meets local codes.  
LINE VOLTAGE  
GAS VALVE  
C1  
CIRC.  
C2  
IMPORTANT: Terminals on the L8151A Aquastat® Relay  
are approved for use only with copper wire. The  
terminals allow wraparound wiring only.  
1. Strip 7/16 in. of insulation  
LINE VOLTAGE  
CIRCULATOR  
L1  
(HOT)  
1
1
LINE  
2
from the wire end.  
L2  
2. Wrapthewireatleastthree  
fourthsofthedistancearound  
G
2
the screws as shown.  
3. Use a standard flat-headed  
M8843  
screwdriver to tighten the  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
screw until the wire is snugly  
in contact with the screw and contact plate.  
4. Tighten the screw an additional one-half turn.  
2
3
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.  
USE GROUNDING SCREW PROVIDED.  
M8886  
B1 IS 1/4 IN. TAB TERMINAL.  
NOTE: Do not use a push-type ratchet screwdriver.  
60-2553—3  
4
L8151A  
OPERATION AND SETTINGS  
Operation and Settings  
HIGH LIMIT  
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 10°F (6°C) differential.  
Fig. 6—L8151A internal schematic.  
2
1
WARNING  
T
CAN CAUSE PROPERTY DAMAGE,  
SEVERE INJURY OR DEATH.  
Product is for use only in a system with a pressure  
relief valve.  
1K  
T
HIGH LIMIT  
1K2  
B2  
B1  
R
B
ZR  
ZC  
LOW  
LIMIT  
LOW LIMIT AND CIRCULATOR CONTROL  
On a temperature rise, with the adjustable differential at  
the minimum setting of 10°F (6°C), the low limit circuit  
(RB) breaks and the circulator circuit (R-W) makes at the  
control setpoint. On a temperature drop of 10°F (6°C)  
below the setpoint, the R-B circuit makes and the R-W  
circuit breaks.  
CIRCULATOR  
CONTROL  
1K1  
W
C2  
C1  
M8884  
Fig. 7—Relationship of setpoints and differen-  
tial.  
Fig. 5—Typical hookup for the L8151A in a  
multizone system.  
TO ADDITIONAL  
R845A RELAYS  
240°F (116°C)  
FOR OTHER ZONES  
SWITCH BREAKS ON  
TEMPERATURE RISE.  
BURNER TURNS OFF.  
T
CIRCULATOR OPERATES  
ON A CALL FOR HEAT.  
HIGH LIMIT  
SETTING  
THERMOSTAT  
ZONE 1  
R845A RELAY  
2
THERM.  
T
10°F (6°C)  
DIFFERENTIAL  
SWITCH MAKES ON  
TEMPERATURE FALL.  
BURNER OPERATES ON A  
CALL FOR HEAT.  
THERMO-  
STAT  
ZONE 2  
1
4
ZC  
ZR  
SWITCH MAKES R-W  
AND BREAKS R-B ON  
TEMPERATURE RISE.  
4
3
5
6
B1  
LOW LIMIT  
AND  
CIRCULATOR  
SETTING  
25°F (14°C)  
DIFFERENTIAL  
1
BURNER  
3
B2  
SWITCH MAKES R-W  
AND BREAKS R-B ON  
TEMPERATURE RISE.  
10°F (6°C)  
DIFFERENTIAL  
C1  
CIRCULATOR  
ZONE 1  
CIRC.  
C2  
SWITCH MAKES R-B AND  
BREAKS R-W ON  
TEMPERATURE FALL.  
BURNER IS ON TO  
MAINTAIN MINIMUM  
WATER TEMPERATURE.  
CIRCULATOR IS OFF.  
CIRCULATOR  
ZONE 2  
L1  
1
(HOT)  
1
LINE  
2
110°F (43°C)  
L2  
1
WHEN WATER REACHES PROPER TEMPERATURE, THE BURNER  
SHUTS OFF OR THE CIRCULATOR PUMP STARTS (WHEN CALLING  
IF CONTROLLING TWO LOADS USE:  
—TERMINALS 3 AND 4 FOR LINE  
VOLTAGE LOAD.  
—TERMINALS 5 AND 6 FOR LINE  
OR LOW VOLTAGE LOAD.  
G
2
FOR HEAT).  
M1523  
HYDRONIC HEATING  
CONTROL TERMINALS  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
At any differential setting greater than 10°F (6°C), the  
R-B make and R-W break temperatures remain the same  
(control setting minus 10°F (6°C). The R-B break and R-W  
make temperatures are the setpoint temperatures plus the  
difference between the differential setting and 10°F (6°C).  
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.  
USE GROUNDING SCREW PROVIDED.  
3
4
LINE VOLTAGE OIL BURNER CONTROL OR GAS VALVE.  
B1 IS 1/4 IN. TAB TERMINAL.  
M8885  
5
60-2553—3  
L8151A  
OPERATION AND SETTINGS • CHECKOUT  
EXAMPLE: Setpoint of 140°F (60°C) differential set at  
25°F (14°C). On a temperature rise, R-B breaks and  
R-W makes at 155°F (68°C). On a temperature fall,  
R-B makes and R-W breaks at 130°F (54°C); see  
Fig. 7.  
THERMOSTAT ANTICIPATOR  
Set the thermostat heat anticipator at 0.2A.  
Checkout  
Put the system into operation and observe each function through at least one complete cycle. Be sure the control operates  
as intended.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Golden Valley, MN 55422  
Scarborough, Ontario M1V 4Z9  

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