DIAGRAM 8 – Adding an 8840 Series Thermostat
MODEL 8870 THERMOSTAT
CAUTION!
TURN ALL DISTRIBUTION PANEL SWITCHES OFF BEFORE DOING ANY WIRING.
MODEL 8818 DISTRIBUTION PANEL
BRN
GRN
BLU/WHT
BLU
ORG/WHT
C |
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R |
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RSR |
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RSC |
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RSB |
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RSA |
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REF |
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B- |
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B+ |
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A- |
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A+ A- B+
A
ON OFF
B
A
OFF ON
B
- B+ A- A+
ORG |
ORG/WHT |
BLU |
ORG
A+ 
B- R C A+ A- B+ B- R C
ON OFF
PWR
A
ON OFF
B
ON OFF
PWR
24VAC
C R
OFF ON
PWR
FUSE
A
OFF ON
B
OFF ON
PWR
MAIN
PWR
ON OFF
C R B- B+ A- A+ C R B
BLU/WHT |
GRN |
BRN |
ORG |
ORG/WHT |
BLU |
BLU/WHT |
BRN |
GRN |
MODEL 8809 COMMUNICATING |
| MODEL 8848 SHOWN | |
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| Y2 |
Communication |
| CLK1 | W1 |
Card |
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| RS2 | G |
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| YEL/BLU | RS1 | R |
| 24V | ||
BLU | RS+v | ||
ORG | 1 | 24V(c) | |
ORG/WHT |
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RED |
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ORG |
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BLK |
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40VA | TSTATWIRE2- | CABLE | 40VA |
XFRMR |
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WIRE TSTAT | CABLE |
2- |
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BLU/WHT |
BLU |
RED |
BLK |
BRN |
GRN |
XFRMR |
Model 8027 PLUG-IN TRANSFORMERS
IMPORTANT! | IMPORTANT! | |
YOU MUST ADDRESS 8840 SERIES | ||
YOU MUST USE A SEPARATE POWER | ||
THERMOSTATS HIGHER THAN ANY | ||
SUPPLY FOR 8840 SERIES THERMOSTATS. | ||
MODEL 8870 THERMOSTAT ON THE | ||
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| NETWORK. |
2.IMPORTANT! When addressing the thermostats, the Model 8870 thermostat(s) must either be the first addresses on the network, or there must be one address skipped between 8840 series thermostats. For example, if one Model 8870 thermostat were to be added to an existing four 8840 series thermostat network then the 8870 thermostat must be addressed #1 or #6. Change the existing address #1 to be #5 and add the 8870 as address #1, or simply add the new thermostat as address #6. IMPORTANT: Set “Number of Stats On Network” to 32 and Set BAUD Rate to 9600.
3.Unplug the Model 8811 Protocol Adapter power supply and
ILLUSTRATION 13 – Remove Terminating Resistors
PROTOCOL ADAPTER WITH
COVER REMOVED
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RJ11 Connectors
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