Honeywell R8182D, Product Data

R8182D,E,F,H,J COMBINATION PROTECTORELAY™ AND HYDRONIC HEATING CONTROLS

68-0105—2

12

Fig. 17. R8182D and R845A in a typical multiple circulator zoning application.

OPERATION

R8182D

A call for heat by the thermostat pulls in relay 1K, which 

energizes the safety switch circuit and relay 2K to turn on the 

burner. Safety switch starts to heat. If burner ignites within 

safety switch timing, the cadmium sulfide flame detector sees 

flame and the safety switch heater circuit is bypassed. The 

burner operates until the call for heat is satisfied. The 

circulator operates when relay 1K pulls in only if R to W is 

made in the Aquastat¨ limit.

When R to B (low limit) is made by a drop in water 

temperature, it acts as a call for heat, pulling in relay 2K to 

turn on the burner. The circulator cannot operate. See Fig. 11, 

16, 17 and 19.

R8182E

The burner and circulator operate whenever the thermostat 

calls for heat. Relay 2K pulls in. When the cadmium sulfide 

flame detector sees flame, the safety switch heater circuit is 

bypassed, and 2K is held in through 2K1. If temperature rises 

to a high limit setpoint, R to B breaks, shutting off the burner. 

The circulator continues operation under the thermostat 

direction. See Fig. 12, 16, 17 and 20.

R8182F

The thermostat call for heat pulls in relay 2K to turn on the 

burner. When the cadmium sulfide the flame detector sees 

flame, safety switch the heater circuit is bypassed. The 

circulator is independent of the thermostat circuit, being 

controlled only by the Aquastat¨ limit switch. See Fig. 13, 17 

and 20.

R8182H

A call for heat by the thermostat pulls in relay 1K, which 

energizes the safety switch circuit and relay 2K to turn on the 

burner. The safety switch starts to heat. If the burner ignites 

within the safety switch timing, the cadmium sulfide flame 

detector sees the flame and the safety switch heater circuit is 

bypassed. The burner shuts Off when a call for heat is 

satisfied. The circulator operates when relay 1K pulls in only if 

R to W in the Aquastat¨ limit is made.

When R to B (low limit) is made by a drop in water 

temperature, it acts as a call for heat, pulling in relay 2K to 

turn on the burner. The circulator cannot operate. See Fig. 14, 

16, 17 and 18.

M4521

L1 
(HOT)

L2

1

5

4

6

3

2

1

2

4

3

6

5

120 VAC POWER SUPPLY. PROVIDE DISCONNECT 
MEANS AND OVERLOAD PROTECTION AS REQUIRED.

THERMOSTAT HEAT ANTICIPATOR SETTING, 0.2 AMP FOR R8182D.

THERMOSTAT HEAT ANTICIPATOR SETTING, 0.4 AMP FOR R845A.

CONTROL CASE MUST BE CONNECTED TO EARTH 
GROUND. USE GROUNDING SCREW PROVIDED.

R8182E,H,J CONNECTIONS FROM ZC AND ZR ARE IDENTICAL
FOR MULTIPLE CIRULATOR ZONING APPLICAITON.

EACH ADDITIONAL ZONE REQUIRES A SEPARATE, 
FIELD-ADDED 24V THERMOSTAT AND R845 RELAY.

24 VOLT
THERMOSTAT

B2
C2

C1

ZR

ZC

B1

R

B

HIGH LIMIT

1K1

1K2

2K1

1K

1K1

1K2

B

R

W

LOW 
LIMIT

1K

2

1

G

T

T

F

F

R8182D

2K

2K2

BILATERAL 
SWITCH

CIRCULATOR

C554A

R2

C1

S.SW
CONTACTS

SAFETY
SWITCH
HEATER

TRIAC

R1

TO WATER
CIRCULATOR

TO OIL 
BURNER
AND 
IGNITION

BLUE

2

1

T

T

5

3

6

4

ZONE 2
THERMOSTAT

R845A 
SWITCHING 
RELAY ZONE 2

ZONE 2
CIRCULATOR

TO ADDITIONAL
ZONES 3, 4, ETC.