Honeywell Aquastat L8124B Product Data page 13

LOW VOLTAGE
THERMOSTAT
ZONE 1
T Z
TV
1K
R
W
LOW LIMIT/
CIRCULATOR
1K2
Fig. 21. L8124L multizone system with circulator connections and internal schematic.
To install the setting stop:
1. Turn the knob to the setting that is to be established as
the limit.
2. Place the setting stop over the knob in the position
where the arm of the setting stop strikes (after the stop
is pressed into place) projection A and prevents turning
the knob beyond the desired limit setting.
3. Press the setting stop tightly onto the knob so its inner
teeth securely engage the knob.
4. Turn the knob back and forth several times to make
sure the stop functions properly.
5. n all the settings are made, replace the cover.
L8124L
2
G
1
2
1K1
B
ZR
ZC
B
HIGH
3
LIMIT
R B1
B2
C2
C1
LINE VOLTAGE
CIRCULATOR
ZONE 1
1 TO ADDITIONAL
R845A RELAYS
L2
L1
FOR OTHER ZONES
(HOT)
LINE VOLTAGE
OIL BURNER
RELAY OR
GAS VALVE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2 CONTROL CASE MUST BE CONNECTED TO EARTH
GROUND. USE GROUNDING SCREW PROVIDED.
3
B1 IS 1/4 IN. TAB TERMINAL.
HIGH LIMIT
SETTING
LOW LIMIT
AND
CIRCULATOR
SETTING
1 WHEN WATER REACHES PROPER TEMPERATURE, THE BURNER
SHUTS OFF OR THE CIRCULATOR PUMP STARTS (WHEN CALLING
FOR HEAT).
Fig. 22. Relationship of set points and differential.
13
L8124A,B,C,E,G,L,M AQUASTAT® RELAYS
R845A RELAY ZONE 2
ZONE 2
CIRCULATOR
6
5
3
4
1
2
ZONE 2
LOW VOLTAGE
THERMOSTAT
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.
SWITCH MAKES R-W
AND BREAKS R-B ON
TEMPERATURE RISE.
SWITCH MAKES R-W
AND BREAKS R-B ON
TEMPERATURE RISE.
SWITCH MAKES R-B AND
BREAKS R-W ON
TEMPERATURE FALL.
BURNER IS ON TO
MAINTAIN MINIMUM
WATER TEMPERATURE.
CIRCULATOR IS OFF.
M8829
1
M1523
60-2061—10