Cheap Heat Pump Controller

thingiverse

#Cheap Heat Pump Controller (CHPC) <br> <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> -------------------------------------------------------------------- <br> ###<b>Applications:</b> ###<b>1. Thermostat.</b> _Brief_: <b>Precision thermostat.</b> Simple and cheap. Only 1 relay and 1 temperature sensor required. _Application examples:_ Room heat control. Chicken coop climate control. Distillation column. Else. ###<b>2. Heat pump (HP) controller.</b> _Brief_: <b> Heat pump controler.</b> 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 HP running conditions. _Application examples:_ DIY heat pump system. Repair module for commercial system. Water heater, house heating systems and same. _Available protections_: Compressor: cold start or overheat. Discharge and suction lines protection. Short-term power loss. Anti-freeze. Power overload protection. Others. ###<b>3. EEV controller.</b> _Brief_: <b> EEV driver</b>, no relays. Requires 2 T sensors. _Application examples:_ Upgrade your system from capilary tube to EEV. _Available protections_: Protects from liquid at suction line by design. For more information about Heap Pumps look at [Wikipedia about HP](https://en.wikipedia.org/wiki/Heat_pump) <br> ###<b>Features</b>: - Up to 13 T sensors (more info: github page), - 5 relays (Compressor, Hot CP or Air Fun, Cold CP or Air Fun, Sump Heater, 4-way valve), - 4 inputs, - 5/6 pin EEV connection, - 1602 display support, - RS485 or Serial(UART 5V) support, - Automatically turns on/of system when heating required, - Takes care of system components health. <br> ###<b>Control interfaces:</b> <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. <b>0.96 OLED or 1602 LCD screen + buttons:</b> Simple, local screen controlled system. Remote control is not possible. <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.\* <b> Remote automated control/stats via RS-485.</b> Firmware was written with python scripting in mind (and real scripts at prototype 485 network). <b> Both screen+buttons and RS-485.</b> Combination allowed. \* RS-485 specification. Hardware test succeeded on 400 meters line. <br> ###<b>Relays:</b> ###<b>"Thermostat"</b>: Only 1 Relay: drives electric heater (any) ###<b>Heat Pump.</b> Capillary tube, TXV, EEV: 5 Relays, drives all you need: * Compressor (can be used as external relay driver for High Power systems) * Cold Circulating Pump (CP) * Hot CP * Sump Heater (optional, recommended for outdoor HP installations) * 4-way Valve (support coming up: autumn 2019) ###<b>Temperature sensors:</b> * Up to 13 temperature sensors can be connected to CHPC to control all processes that you want. * Only 1 sensor needed for "Thermostat" or "Heat Pump capillary/TXV" * 3 sensors needed for "HP with EEV" (absolute minimum scheme) <br> * See [https://github.com/gonzho000/chpc](https://github.com/gonzho000/chpc) for more details and firmware