Honeywell Aquastat L8124B Product Data page 9

1
L1
(HOT)
L2
L8124E
2
G
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. L8124B in a gas-fired, millivolt, forced hot water, tankless, zoned, pump system.
LOW VOLTAGE
THERMOSTAT
L8124E
T Z
TV
1K
1K2
W R
B
LOW LIMIT/
CIRCULATOR
R
HIGH
LIMIT
B
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
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. 14. L8124E single zone connections
and internal schematic.
T87F
R845 RELAY
T T
1 2 3 4 5 6
PUMP
L2 L1 T T
THPP
3
C1 C2 B2 B1
TR
MILLIVOLTAGE
GAS VALVE
(eg, VS820)
2
G
L1
1
(HOT)
2
L2
1
1K1
LINE VOLTAGE
CIRCULATOR
C1
C2
3
TR
B1
B2
TH
LOW VOLTAGE
GAS VALVE
(eg, VR8300)
M8803
L8124A,B,C,E,G,L,M AQUASTAT® RELAYS
T87F
R845 RELAY
T T T
1 2 3 4 5 6 1
PUMP PUMP
Q313A
PILOT
GENERATOR
PP
1
L1
(HOT)
L2
2
G
C1 C2
CIRCULATOR
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. 15. L8124E in a 24V, gas-fired
forced hot water, tankless system.
9
T87F
R845 RELAY
T
2 3 4 5 6
M8841
T87F
L2 L1 T T L8124E
3
B2 B1
TH
TR
LOW VOLTAGE
GAS VALVE
(eg, VR8300)
M1796A
60-2061—10