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THREE-WIRE
LOW VOLTAGE
(SERIES 10)
1
THERMOSTAT
R(T)
W(T)
B
R(T)
X2
W(T)
X1
C
RA889A
1 MAKES CONTACT ONLY ON TEMPERATURE FALL.
Fig. 6. RA889A thermostat connections.
A.
FOR 24V THERMOSTAT CONTROL
RA889A
L1, (HOT)
L1
NEUTRAL
L2
COM
LINE VOLTAGE
CONTROLLED
N.O.
OUTPUTS
N.C.
B.
FOR LINE VOLTAGE CONTROL
LINE VOLTAGE
RA889A
CONTROL
L1
3
NEUTRAL
L2
COM
N.O.
N.C.
C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE
RA889A
L1
NEUTRAL
L2
1
COM
N.O.
N.C.
1
REQUIRED FOR OUTPUT LED OPERATION.
2
FOR SERIES 10 OR OTHER HARDWIRED ELECTRONIC 3-WIRE
THERMOSTATS.
3
WARNING! ELECTROCUTION HAZARD. POWER SUPPLY CAN
CAUSE SEVERE INJURY OR DEATH. DISCONNECT POWER BEFORE
WIRING OR SERVICING L1. POWERED RELAYS MUST BE WIRED AS
DRY CONTACTS.
Fig. 7. RA889A control options.
TWO-WIRE
LOW VOLTAGE
(SERIES 80)
THERMOSTAT
X2
R(T)
W(T)
X1
C
RA889A
M13316
THERMOSTAT
R(T)
R
W(T)
W
C
C
OPTIONAL
2
X1
LOW VOLTAGE
CONTROLLED OUTPUT
X2
R(T)
JUMPER
W(T)
C
X1
X2
R(T)
W(T)
24V CONTROLLER
INPUT SUPPLY
C
X1
X2
CHECKOUT
1. Keep the cover on the relay during normal operation
and remove only for service and checkout.
2. Relay contacts require no cleaning; they are
arranged to close with a wiping action and are self-
cleaning. The contacts may turn black after being in
service for some time; this discoloration does not
prevent proper operation.
3. After installation is complete, operate system
through at least one cycle from the controller to
make certain the relay controls the equipment as
intended.
TROUBLESHOOTING
Test Button
— This connection is the same as a call for heat connec-
tion between the R(T) and W(T) terminals.
Relay LED
— This LED lights whenever there is 120 Vac (L1) on
the N.O. terminal (when COM/N.O. relay contacts
are closed).
M13317
5
RA889A SWITCHING RELAY
69-1293—1
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