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100 lines
3.7 KiB
Markdown
100 lines
3.7 KiB
Markdown
### CHPC: Cheap Heat Pump Controller v1.0
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<b>The CHPC a minimal cost Heat Pump (HP) controller, which can be used as provided, or can be adopted to nearly all use cases due to open source nature.</b>
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## Development
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State: active
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## Applications:
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| Usage. | Brief description. | Application examples | Available protections |
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| ---------- | ------------------ | ------------------ | -------------------- |
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| 1. Thermostat. | Precision thermostat. Simple and cheap.<br> Only 1 relay and 1 temperature sensor required.<br> | Room heat control. Chicken coop climate control. Distillation column or Yogurt maker t. control. Else. | N/A |
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| 2. Heat pump (HP) control. | Controller drives HP system components: compressor, Cold and Hot side Circulating Pumps (CP). Protects system from overload, overheat and freezing up. Drives EEV* to optimize running conditions. | DIY heat pump system. Repair module for commercial system. Water heater, house heating systems and same. | Compressor: cold start or overheat. Discharge and suction lines protection. Short-term power loss. Anti-freeze. Power overload protection. |
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* under development
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For more information about Heap Pumps look at [Wikipedia about HP](https://en.wikipedia.org/wiki/Heat_pump)
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<br>
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### <b>Control interfaces:</b>
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<b>None:</b> Target temperature uploaded to board with firmware and cannot be changed. System used as fixed thermostat. Target temperature can be changed later with firmware re-upload.
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<b>0.96 OLED or 1602 LCD screen + buttons:</b> Simple, local screen controlled system. Remote control is not possible.
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<b>Remote computer terminal over RS-485 line. </b> Target temperature and running conditions under remote control. User can get stats from all T sensors. Up to 1.2 kilometer line.\*
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<b> Remote automated control/stats via RS-485.</b> Firmware was written with python scripting in mind (and real scripts at prototype 485 network).
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\* RS-485 specification. Hardware test succeeded on 400 meters line.
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<br>
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### <b>Relays:</b>
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### <b>"Thermostat"</b>:
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Only 1 Relay: drives electric heater (any)
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### <b>Heat Pump.</b> Capillary tube, TXV, EEV:
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5 Relays, drives all you need:
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* Compressor (can be used as external relay driver for High Power systems)
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* Cold Circulating Pump (CP)
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* Hot CP
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* Sump Heater (optional, recommended for outdoor HP installations)
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* 4-way Valve (support coming up: autumn 2019)
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### <b>Temperature sensors:</b>
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* Up to 13 temperature sensors can be connected to CHPC to control all processes that you want.
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* Only 1 sensor needed for "Thermostat" or "Heat Pump capillary/TXV"
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* 3 sensors needed for "HP with EEV" (absolute minimum scheme)
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<br>
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## PCB Design
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There are 2 PCB designs: type "F" and type "G".
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## Type "F" features:
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- **mostly SMD** componens,
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- **internal power** source,
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- **10** output channels,
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- 4 input channels,
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- 5 relays: 1 * 16A + 4 * 7A,
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- buzzer,
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- EEV support,
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- 16 bit **i2c ADC: on board**,
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- i2c devices: allowed,
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- T sensors: ds18b20 on one lane.
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## Type "G" features:
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- **no SMD** components,
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- **external or board-placed** power source,
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- **5** output channels,
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- 4 input channels,
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- 5 relays: 2 * 16A + 3 * 7A,
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- buzzer,
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- EEV support,
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- 16 bit **i2c ADC: off board**,
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- i2c devices: allowed,
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- T sensors: ds18b20 on one lane.
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# Type "F" PCB
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# Type "G" PCB
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....
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....
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Drafts below.
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Sensors abbreviations:
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| Abbr. | Full name |
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| ----- | -------------------- |
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| Tae | after evaporator |
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| Tbe | before evaporator |
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| Ttarget | target |
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| Tsump | sump |
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| Tci | cold in |
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| Tco | cold out |
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| Thi | hot in |
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| Tho | hot out |
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| Tbc | before condenser |
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| Tac | after condenser |
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| Touter | outer (outdoor) |
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| Ts1 | additional sensor1 |
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| Ts2 | additional sensor2 |
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