RA889A SWITCHING RELAY
68-0216—26
Fig. 5. R8888 zone expansion using RA889A Switching Relays.Fig. 6. RA889A thermostat connections.C2 C1
H1 H2
L2 L1 L1 ZC
R W
R C A B C
R W R W R W
C2 C1 C2 C1 C2 C1
ZONE 1
ZONE 2
ZONE 3
ZONE 4
CIRCULATOR
PUMP 1
CIRCULATOR
PUMP 2
CIRCULATOR
PUMP 3
CIRCULATOR
PUMP 4
CIRCULATOR
PUMP 5
ZONE 1
THERMOSTAT
ZONE 5
THERMOSTAT
ZONE 2
THERMOSTAT
ZONE 3
THERMOSTAT
ZONE 4
THERMOSTAT
L1
L2
X2
X1
N.O.
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.
USE GROUNDING SCREW PROVIDED.
1
1
20 VA
M13321
R8888 1
G
RA889A
R(T)
W(T)
TO APPROPRIATE
CONNECTIONS
AS REQUIRED
BY THE SYSTEM.
H1-H2 TYPICALLY
CONNECTED TO
T-T OF BURNER
CONTROL SYSTEM.
ZC
H1
H2
2
2
USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1
CONNECTIONS, USE WIRE RATED FOR AT LEAST 167°F (75°C).
G
L2 L1
3
4
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
CONNECT L1-ZC JUMPER, IF REQUIRED.
L1
(HOT) L2 3
COM
W(T)
C
R(T)
X1
B
X2
W(T)
RA889A RA889A
THREE-WIRE
LOW VOLTAGE
(SERIES 10)
THERMOSTAT
TWO-WIRE
LOW VOLTAGE
(SERIES 80)
THERMOSTAT
1
1MAKES CONTACT ONLY ON TEMPERATURE FALL.
M13316
R(T)
CX1 X2
W(T)
R(T)