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RA889A SWITCHING RELAY
L1
(HOT)
1
L2
G
L2
L1
2
C1
C2
L7148F/L8148E
Fig. 4. RA889A hookup for L7148F/L8148E in a gas-fired, 24V, zoned, pump system.
R8888
ZONE 1
THERMOSTAT
ZONE 2
THERMOSTAT
ZONE 3
THERMOSTAT
ZONE 4
THERMOSTAT
1
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.
USE GROUNDING SCREW PROVIDED.
2
USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1
CONNECTIONS, USE WIRE RATED FOR AT LEAST 167°F (75°C).
Fig. 5. R8888 zone expansion using additional RA889A Switching Relays.
69-1293—1
T87F
RA889A RELAY
R(T)
W(T)
L1
L2
X1
X2
N.O.
COM
PUMP
T
T
TR
3
THTR
B2
B1
TH
20 VA
ZONE 1
ZONE 2
ZONE 3
ZONE 4
T87F
RA889A
R(T)
W(T)
L2
L1
COM
N.O.
X1
X2
PUMP
LOW VOLTAGE
GAS VALVE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
(eg, VR8300)
OVERLOAD PROTECTION AS REQUIRED.
2
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.
USE GROUNDING SCREW PROVIDED.
B1 IS 1/4 IN. TAB TERMINAL.
3
L1
(HOT) L2 3
1
G
4
CIRCULATOR
PUMP 1
CIRCULATOR
PUMP 2
CIRCULATOR
PUMP 3
CIRCULATOR
PUMP 4
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
4
CONNECT L1-ZC JUMPER, IF REQUIRED.
4
T87F
R(T)
W(T)
L1
L2
COM
N.O.
PUMP
RA889A
L2
CIRCULATOR
PUMP 5
L1
N.O.
ZC
TO APPROPRIATE
CONNECTIONS
H1
X1
AS REQUIRED
BY THE SYSTEM.
H2
X2
H1-H2 TYPICALLY
CONNECTED TO
COM
T-T OF BURNER
CONTROL SYSTEM.
ZONE 5
THERMOSTAT
R(T)
W(T)
G
1
RA889A
X1
X2
M13314
M13321
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