Honeywell RA889A - Manual (Page 6)

RA889A SWITCHING RELAY
68-0216—2 6
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
1 MAKES CONTACT ONLY ON TEMPERATURE FALL. M13316
R(T) C X1 X2 W(T) R(T)