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L8124A,C,E,L AND M AQUASTAT® RELAYS
On the L8124M, the burner and circulator circuits are
separately controlled; the low limit controls the burner
circuit (R-B) as described above, while the low voltage
thermostat directly controls the circulator circuit.
See Fig. 13.
LOW VOLTAGE
THERMOSTAT
L8124M
T
T
1K
R
W
LOW LIMIT
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.
Fig. 13. L8124M single zone connections
and internal schematic.
Automation and Control SolutionsAutomation and Control Solutions
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422
95-6571—11
G.R. Rev. 12-01
2
G
L1
L1
(HOT)
L2
L2
ZC
1K1
LINE VOLTAGE
CIRCULATOR
B
C1
C2
LINE VOLTAGE
B
OIL BURNER
RELAY OR
HIGH
3
GAS VALVE
LIMIT
R
B1
B2
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9
SETTING
Follow the boiler manufacturer recommendations when
making the L8124 settings. The high limit setting must be
at least 20°F (11°C) higher than the low limit setting. Set
the indicators over the selected temperature marks. The
low limit differential is set by turning the differential
adjustment knob to the desired amount of differential.
The thermostat heat anticipator should be set at 2.0A.
CHECKOUT
Put the system into operation and observe each function
through at least one complete cycle. Be sure the control
1
operates as intended.
M8804
www.honeywell.com
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