Controls Guide for Air-Water Heat Pump Systems
11 November 2024
Building Regulations Approved Document L1 was updated in 2021 to incorporate text from previous Domestic Building Services Guide. However, the requirements for heat pump controls could be clearer, particularly with regardsto the requirements where TRVs are installed.
This guide is part of an evolution for system guidance, intended to assist domestic heat pump installers with considerations for controls strategies in various applications in a way that ensures compliance with Building Regulations Approved Document L. It provides a general approach which could be taken for new and existing hydronic heat pump only systems (note: bi-valent and hybrid systems are not included in scope). Additional considerations may be required for underfloor heating systems or non-radiator solutions. This document is not intended as a heat pump design guide. Generic exemplar schematics are provided for guidance purposes only. For each application, the system designer or installer must consider the requirements of all relevant Regulations, refer to heat pump manufacturers and system component manufactures instructions, and consider the specific building constraints and any preferences of the homeowner.
