Baxi SPC Split 150 WH

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document describes the BAXI SPC Split 150 WH thermodynamic water heater, a system designed for domestic hot water production.

Function Description

The BAXI SPC Split 150 WH is a thermodynamic water heater that utilizes a heat pump to extract energy from the outside air, thereby heating the domestic hot water. It features an accumulation domestic hot water tank, a control panel with timer programming, and a 1600 W shielded immersion heater for supplementary heating. The system is designed to operate efficiently, with the heat pump handling most of the heating, and the immersion heater providing additional heat when outdoor temperatures are outside the optimal range (-15 °C to +42 °C) or when a higher setpoint temperature is desired. The system can be configured in various operating modes, including Automatic, Hybrid (with boiler back-up), Optimisation, and Cooling mode (for refrigerant recovery).

Important Technical Specifications

The SPC Split 150 WH has a storage volume of 150 liters, providing 205 liters of mixed water at 40 °C. It operates at a maximum water temperature of 75 °C and an operating pressure of 1.0 MPa (10 bar). The system uses R-134a refrigerant, with a quantity of 1.60 kg, equivalent to 2.28 tCO2e. The outdoor unit weighs 33.5 kg, while the domestic hot water tank (empty) has a gross weight of 78 kg and a net weight of 63.5 kg. The maximum operating amperage is 11 A. The compressor uses POE oil, and the maximum air flow rate is 1300 m³/h.

The outdoor unit's limit operating temperatures range from -15 °C to +42 °C, with a domestic hot water set point range of 25 °C to 75 °C. The heating time from 10 °C to 55 °C is approximately 4 hours and 5 minutes. The absorbed electrical power of the outdoor unit is 9 W, and the COP (in accordance with EN16147 standard) is 3.36. The domestic hot water reference temperature is 53.6 °C, and the outdoor unit output is 1750 W. The immersion heater output is 1600 W. The refrigeration connection length can range from 2 to 20 meters, with a maximum difference in height of 10 meters. Both the domestic hot water tank and the outdoor unit have an IP24 protection rating.

The system includes various temperature sensors: exchanger, outside air, suction, domestic hot water tank, and air discharge. These sensors have specific resistance values (in kOhm) at different temperatures, allowing for precise monitoring and control of the system's operation. For instance, the domestic hot water tank temperature sensor shows 526 kOhm at -20 °C, decreasing to 1.97 kOhm at 120 °C.

Usage Features

The control panel, designed for ergonomic use and installed at eye level, allows users to select operating modes and set parameters. The "Holiday mode" can be activated for extended periods of absence, ensuring frost protection and saving control panel parameters without completely shutting down the unit. The electrical back-up function can be set to activate when the outside temperature falls below a user-defined threshold. Hysteresis settings for water heating can be configured to prevent frequent on/off cycling of the thermodynamic water heater, optimizing its lifespan and efficiency. The control panel displays the set temperature, current temperature, and operational status, including error codes if any issues arise.

Maintenance Features

Regular maintenance is crucial for optimal performance and extended lifespan of the appliance. The manual outlines a comprehensive maintenance schedule for both the outdoor unit and the domestic hot water tank.

General Maintenance:

Safety Valve Operation: The safety valve or unit must be operated at least once a month to prevent pressure surges and ensure its correct function.
Casing Cleaning: The casing of both units should be cleaned with a damp soft cloth once a year.

Outdoor Unit Maintenance:

Cooling Circuit Check: Annually, the cooling circuit should be checked for tightness using a leak detector, and the performance of the heat pump and temperatures should be verified. Refrigerant fluid should be collected if connections need to be disconnected.
Fan and Evaporator Cleaning: The outdoor unit fan and evaporator should be cleaned annually to prevent clogging by dust and particles, which can impair heat pump performance. This involves removing the front panel, cleaning with a soft brush or compressed air, and realigning bent fins.
Refrigerant Recovery: In case of replacement or recycling, the refrigerant fluid must be recovered from the outdoor unit in accordance with industry codes of practice, by activating the "Cooling mode" from the control panel.

Domestic Hot Water Tank Maintenance:

Descaling: The domestic hot water tank should be descaled after the first year of use, and then every two years. This involves draining the tank, removing the inspection hatch, and cleaning limescale deposits.
Magnesium Anode Check: The magnesium anode's condition should be checked after the first year of use, and then every two years. This can be done visually (by draining the tank and measuring the anode's diameter) or electrically (by measuring the current between the tank and anode). If the diameter is less than 15 mm or the current is less than 0.1 mA, the anode needs replacement.
Inspection Hatch Replacement: A new gasket should be used every time the inspection hatch is opened to ensure tightness.

The manual also provides detailed instructions for troubleshooting error codes, resetting the safety thermostat, and ordering spare parts, emphasizing the use of genuine or recommended components.