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This document serves as a quick start guide for the Riello Monobloc range of heat pumps, focusing on typical installations with third-party controls. It covers installation, setup, and operational procedures for the monobloc system, as well as important warranty conditions, power supply requirements, control wiring, and troubleshooting.
The Riello Monobloc heat pump system is designed for heating via a buffer tank and domestic hot water (DHW) production via a cylinder. It integrates with a sensor pocket and an immersion heater, utilizing a 3-port drive-open valve to manage space heating and DHW demand. While the unit's internal controller is for technician use, end-user control is managed through third-party controllers. The heat pump prioritizes DHW heating, including an optional sterilization cycle assisted by the immersion heater, using a W plan heating configuration. Hot water temperature is managed via the Riello Controller. The monobloc unit does not contain an internal electric heater but includes a flow sensor, pump, auto air vent, safe relief valve, and an 8-liter expansion vessel.
The manual provides detailed specifications for various Riello Monobloc models (NXHM 04 to NXHM 16T), including minimum, recommended, and maximum flow rates. For instance, the NXHM 04 requires a minimum flow rate of 6.64 Lpm, a recommended 11.4 Lpm, and a maximum of 14.16 Lpm. Larger units like the NXHM 16T require a minimum of 11.62 Lpm, a recommended 45.6 Lpm, and a maximum of 49.98 Lpm. Failure to achieve correct flow rates can lead to poor performance and potential faults.
Power supply requirements are also detailed, specifying nominal cross-sectional areas for flexible cords and cables for fixed wiring based on the rated current of the appliance. For example, appliances with a rated current of ≤3A require 0.5 and 0.75 mm² flexible cords and 1 and 2.5 mm² fixed wiring, respectively. Larger units (e.g., >50A and ≤63A) require 10 and 16 mm² flexible cords and 10 and 25 mm² fixed wiring. The document also provides a table (Table 9-2) outlining voltage, frequency, minimum/maximum voltage, MCA, TOCA, MFA, MSC, RLA, KW, and FLA for different system sizes (4kW to 18kW 3-PH). All electrical connections must be completed by a NICEIC competent electrician. An immersion heater installed in the DHW tank requires its own independent supply, directly from the PCB, necessitating an additional 13amp supply and suitably sized cable. All supplies should be via a double-switched isolator.
The unit's operation involves several setup steps, including configuring DHW mode settings (e.g., DHW mode, disinfection, DHW priority, DHW pump, DHW priority time set), buffer tank delay (T_BLAY), DHW pump maximum runtime (T_DHWHP_MAX), and sterilization cycle planning time (T_STERIL_PLANNING_TIME). Cool mode settings (e.g., cool mode, cool mode setting, T4CMAX, T4CMIN, dT1SC) are also configurable. Heat mode settings include selecting the heat mode (e.g., 3.1 HEAT MODE YES), T4 FRESH_H, T4HMAX, T4HMIN, dT1SH, DTSH, INTERVAL_H, T1SetH1, T1SetH2, T4H1, and T4H2. The manual also describes how to activate the weather-compensated curve, which adjusts the flow temperature based on ambient air temperature. For instance, a setting of 45 degrees flow temp at -2 degrees outside and 30 degrees flow temp at 15 degrees outside ambient air temperature can be achieved.
The controller interface features a menu, ON/OFF button, OK button, and navigation arrows. Keys and their functions are:
The manual outlines important pre-commissioning checks to ensure proper installation and operation, which are crucial for warranty validation. These include verifying the installation of the manufacturer-supplied filter, flushing the system according to BS7593, using a suitable heat transfer fluid with minimum frost protection of -12, and incorporating a biocide if not already in the solution. A 25-liter buffer is recommended for 4-10kW units and a 40-liter buffer for 12-16kW units to maintain minimum system water volume. Pipework diameter should be sized correctly, with a minimum internal bore of 28mm for copper pipework. The external monobloc unit must be installed on a level base capable of withstanding its weight, with proper condensate disposal. Adequate airflow around the unit is essential, requiring minimum clearances (300mm left, 600mm right, 300mm behind, 1000mm front for 4-6kW, and 1500mm front for 8-16kW units).
The document also details DIP switch settings (S1, S2, S4) located on the unit's main PCB, which control various functions. For example, DIP switch 1/2 should be set to OFF if the internal backup heater is not fitted. DIP switch 3/4 should be set to OFF/OFF to deactivate the IBH and AHS. DIP switch 2 should be set to OFF if the immersion heater is connected to the unit. DIP switch 3/4 should be set according to the pump installed in the unit.
A "Test Mode" is available via the SERVICEMAN menu to check various outputs and perform an air purge function. This mode allows technicians to verify the functionality of components like the 3-way valve, pumps, and other outputs. A "Factory Reset" option is also available in the SERVICEMAN menu to revert all settings to default.
The manual includes a comprehensive list of fault codes (C7 to PED board error) to assist with troubleshooting. These codes cover issues such as transducer module temperature, water flow failure, phase sequence error, communication errors, domestic hot water tank temperature sensor errors, refrigerant temperature sensor errors, pressure sensor errors, and inverter module protection. Each fault code provides a brief description of the problem, enabling quicker diagnosis and resolution.
Finally, the document provides MCS (Microgeneration Certification Scheme) and ENA (Energy Networks Association) certification details for each Riello Monobloc unit, including the MCS Certified Product number and Maximum System Demand. This information is crucial for compliance and understanding the unit's performance within regulatory frameworks.
General| Brand | Riello |
|---|---|
| Model | NXHM 04 |
| Category | Air Conditioner |
| Language | English |
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