Appendix 1
SPECIAL CONSIDERATIONS FOR INSTALLING THE MODEL 8870 WITH THE 8840 SERIES COMMUNICATING THERMOSTAT
If adding a Model 8870 thermostat to a system using 8840 series thermostats (8844, 8846, 8847 or 8848), you must change the power supply installation, modify the addressing method and remove terminating resistors from the Model 8811 protocol adapter.
1.A separate power supply is required for Model 8870 thermostats and 8840 series thermostats. This requires different wiring.
•If using a Model
•If using a Model 8818 Distribution Panel you must use the 8840 series thermostat with an 8809
NOTE:
1.IF USING AN EXISTING HYPERTERMINAL CONNECTION YOU MAY NEED TO UNCHECK THE “SEND LINE FEEDS…” BOX.
2.THE MODEL 8870 HAS AN EXPANDED COMMAND SET. REFER TO DP 10004345 FOR THE MODEL 8840 SERIES COMMAND SET.
DIAGRAM 7 – Adding an 8870 Thermostat
MODEL 8870 THERMOSTAT
BRN | C | RC |
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IMPORTANT! |
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| GRN | R | RH | IMPORTANT! |
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YOU MUST USE A SEPARATE POWER |
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| RSR |
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| RSC |
| YOU MUST ADDRESS 8840 SERIES | |||
SUPPLY FOR 8870 THERMOSTAT(S). |
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| RSB | THERMOSTATS HIGHER THAN ANY MODEL | ||||
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| G | |||
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| RSA | 8870 THERMOSTAT ON THE NETWORK. | ||
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| HUM W1 | |||
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| REF | DEH Y1 |
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| B- |
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| BLU/WHT | W2 |
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| B+ |
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| BLU | Y2 |
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| A- |
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| ORG/WHT |
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| ORG | A+ |
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| Y2 | |
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| CLK1 | W1 |
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| CLK2 | Y1 | |
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| RS2 | G | ||||||
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| RS1 | R |
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| 24V | |
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| RS+v | |
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| ON |
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| 24V(c) | |
| BLU | OR |
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| 1 | |||
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| 2 | W2 | ||
| BLU/ |
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| BL |
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| WHT | OFF | OFF |
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| ORG | BK |
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| ON | ON |
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| ORG/ |
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| RD |
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| Communication Card |
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| WHT |
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| 2/ |
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| 8840 SERIES THERMOSTAT | |
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| OFF | YB | OFF |
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| BRN |
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| ON | 24V | ON |
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Model 8027 | GRN |
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| 24Vc |
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B4 |
| B8 |
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| Model 8027 |
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TRANSFORMER |
| OFF |
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TSTATWIRE CABLE | 485 SERIAL IN ON | ON |
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| POWER |
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| OR BL BK RD |
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| 24V AC |
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2- | OFF | OFF |
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CAUTION!
TURN ALL DISTRIBUTION PANEL SWITCHES
OFF BEFORE DOING ANY WIRING.
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