L8124A,B,C,E,G,L,M AQUASTAT® RELAYS
13
60-2061—10
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.
Fig. 22. Relationship of set points and differential.
M8829
L1
(HOT)
L2
1
3
1
2
3
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
CONTROL CASE MUST BE CONNECTED TO EARTH
GROUND. USE GROUNDING SCREW PROVIDED.
B1 IS 1/4 IN. TAB TERMINAL.
2
1
4
3
5
6
LOW VOLTAGE
THERMOSTAT
ZONE 1
ZONE 2
LOW VOLTAGE
THERMOSTAT
R845A RELAY ZONE 2
ZONE 2
CIRCULATOR
TO ADDITIONAL
R845A RELAYS
FOR OTHER ZONES
LINE VOLTAGE
OIL BURNER
RELAY OR
GAS VALVE
LINE VOLTAGE
CIRCULATOR
ZONE 1
B2
C2
C1
ZR
B1
R
B
HIGH
LIMIT
Z
1K1
B
R
W
LOW LIMIT/
CIRCULATOR
1K
2
1
G
T
TV
L8124L
1K2
ZC
LOW LIMIT
AND
CIRCULATOR
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.
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.
M1523
SWITCH MAKES R-W
AND BREAKS R-B ON
TEMPERATURE RISE.
WHEN WATER REACHES PROPER TEMPERATURE, THE BURNER
SHUTS OFF OR THE CIRCULATOR PUMP STARTS (WHEN CALLING
FOR HEAT).
1
1
