# ThermIQ — Schaltschrank (Electrical Cabinet) ASP1

Adrian is responsible for the Schaltschrank design and build. This document tracks decisions, component list, wiring notes, and open items.

## Cabinet Designation: ASP1

First installation: Walda, Germany.

## AC Power Distribution

```
Grid 230V/400V
    └── Q0: FI/LS (RCD + MCB) — main protection
            └── 230 V AC busbar
                    ├── LS Miner 1 → K10 (contactor) → Miner 1 (2x Schuko)
                    ├── LS Miner 2 → K11 (contactor) → Miner 2 (2x Schuko)
                    ├── LS Pumpen → P3, P4, P5 (Wilo Stratos PICO plus)
                    ├── LS Ventile → Relay block K3-K6 → RV1, RV2 (Belimo CQ230A)
                    ├── LS RK → K2 → Rückkühler fan
                    └── LS PSU → 24 V DC PSU
```

## 24 V DC Distribution

```
24 V DC PSU
    ├── RevolutionPi (Core + DIO + AIO)
    ├── Safety relay (coil supply + input circuit)
    ├── Relay coils: K2, K3, K4, K5, K6, K7
    └── Fuses per branch
```

## Relay / Contactor Summary

| ID | Type | Coil | Load | Function |
|----|------|------|------|----------|
| K2 | Relay | 24 V DC | 230 V AC | Rückkühler fan |
| K3 | Relay | 24 V DC | 230 V AC | RV1 AUF |
| K4 | Relay | 24 V DC | 230 V AC | RV1 ZU |
| K5 | Relay | 24 V DC | 230 V AC | RV2 AUF |
| K6 | Relay | 24 V DC | 230 V AC | RV2 ZU |
| K7 | Relay | 24 V DC | potential-free | Heat pump EVU I1 |
| K10 | Contactor | safety output | 230 V AC | Miner 1 power |
| K11 | Contactor | safety output | 230 V AC | Miner 2 power |

## RevolutionPi I/O Mapping

### Digital Outputs (DO)

| DO | Function | Load |
|----|----------|------|
| DO_K2 | Rückkühler fan relay | K2 coil |
| DO_K3 | RV1 AUF | K3 coil |
| DO_K4 | RV1 ZU | K4 coil |
| DO_K5 | RV2 AUF | K5 coil |
| DO_K6 | RV2 ZU | K6 coil |
| DO_EVU_SPERRE | Heat pump block | K7 coil |

### Digital Inputs (DI)

| DI | Signal | Source |
|----|--------|--------|
| DI_SAFETY_OK | Safety relay output | Safety relay |
| DI_K10_FB | K10 feedback | K10 Hilfskontakt |
| DI_K11_FB | K11 feedback | K11 Hilfskontakt |
| DI_RK_FAULT | Rückkühler fault | Optional |

### Analog Outputs (AO)

| AO | Function | Range | Target |
|----|----------|-------|--------|
| AO1 | P3 setpoint | 0–10 V | Wilo PICO BMS module |
| AO2 | P4 setpoint | 0–10 V | Wilo PICO BMS module |
| AO3 | P5 setpoint | 0–10 V | Wilo PICO BMS module |

### Analog Inputs (AI)

| AI | Signal | Range | Notes |
|----|--------|-------|-------|
| AI1 | Temperature Pufferspeicher | (TBD) | 4-20 mA or 0-10 V |
| AI2 | Temperature Warmwasser | (TBD) | |

## Wiring Notes

- **0–10 V pump cables**: use shielded cable, shield connected to PE at cabinet end only
- **Safety circuit**: NC contacts in series for E-Stop, FLOW OK, TEMP MAX
- **Contactor feedback**: Hilfskontakt (NC) in series in safety relay feedback loop
- **EVU relay K7**: potential-free — verify no voltage is applied to Buderus I1
- **Miner Schuko**: both plugs of each miner routed through its contactor
- **PE**: all metal enclosures to PE

## Commissioning Checklist

- [ ] Verify Q0 FI/LS trips correctly
- [ ] Verify safety relay trips on E-Stop 1
- [ ] Verify safety relay trips on E-Stop 2
- [ ] Verify safety relay trips on FLOW OK open
- [ ] Verify safety relay trips on TEMP MAX open
- [ ] Verify K10 and K11 de-energize on safety trip
- [ ] Verify K7 does not inject voltage into Buderus I1
- [ ] Verify RevPi AO1-AO3 reach correct voltages (0, 5, 10 V)
- [ ] Verify P3, P4, P5 respond to 0-10 V setpoint
- [ ] Verify RV1 opens/closes via K3/K4
- [ ] Verify RV2 opens/closes via K5/K6
- [ ] Test miner power-up via gRPC API
- [ ] Verify Deye RS485 data readable from RPi

## Open Items / Decisions Pending

- [ ] Exact current ratings for Miner 1/2 Schuko circuits (S19J ~3200 W = ~14 A each)
- [ ] Confirm Pufferspeicher / Warmwasserspeicher sensor types (PT1000 / 4-20mA)
- [ ] Confirm RevPi AIO module exact model (AIO hat or separate module)
- [ ] Decide if Hand/0/Auto switches needed on valve circuit
- [ ] Confirm Rückkühler motor protection (motor starter vs. MCB)
- [ ] Smart meter integration protocol
- [ ] Battery connection to Deye (type, capacity)