. Level 3 Air Conditioning Inspections for Buildings 3. Unitary & Packaged Units for L3 Competent Air Conditioning Assessors (Day 1) PRESENTED BY Anthony Balaam aircon@stroma.com

L3 Packaged System Unitary Packaged Units:- Indoor and outdoor components in self-contained ‘unitary’ package. Installed as ‘through the wall unit’. May be reversible if a heat pump. May have electric resistance heater. Unitary packaged units: the indoor and outdoor units are both contained in a self-contained ‘unitary’ housing, often installed as a ‘through the wall’ unit. The unit may be reversible allowing operation as a heat pump, or electric resistance heating may be included.

L3 Packaged System

L3 Packaged System Also referred to as ‘split packaged units’. Individual Split Systems:- Also referred to as ‘split packaged units’. HEAT REJECTION REFRIGERANT CIRCUIT COOLING Maximum length depends on the manufacture but as a guide about 30m Split packaged units: a single indoor unit is connected by refrigerant pipework to a single outdoor unit. The indoor unit may be floor, wall or ceiling mounted. The unit may be reversible allowing operation as a heat pump, or electric resistance heating may be included. HEAT REJECTION REFRIGERANT CIRCUIT COOLING INDOOR UNIT OUTDOOR UNIT

L3 Packaged System Also referred to as ‘multi-split packaged units’. Multi-Split Systems:- Also referred to as ‘multi-split packaged units’. HEAT REJECTION REFRIGERANT CIRCUIT Multi-split packaged units: a number of indoor units are connected to a common outdoor unit by their own dedicated refrigerant pipework. The indoor units may be floor, wall or ceiling mounted. The system may be reversible allowing operation of all the indoor units as heaters in heat pump mode, or electric resistance heating may be included. DISTRIBUTION PIPES SINGLE or MULTIPLE OUTDOOR UNITS MULTIPLE INDOOR UNITS

(CAN HAVE VARIABLE FLOW) L3 Packaged System Variable Refrigerant Flow (VRF) Systems Allows variable control of different branches. REFRIGERANT CIRCUITS (CAN HAVE VARIABLE FLOW) HEAT REJECTION Variable refrigerant flow ( VRF) systems: a number of indoor units are connected to a common outdoor unit by refrigerant pipework on a common network. The indoor units may be floor, wall or ceiling or mounted. Each indoor unit may operate to provide either cooling or heating, allowing heat transfer between zones that require cooling and those that require heating, with the outdoor unit operating in heat rejection or heat pump mode as necessary. REFRIGERANT CIRCUIT BRANCH CONTROL MANIFOLD SINGLE or MULTIPLE OUTDOOR UNITS MULTIPLE INDOOR UNITS

L3 Packaged System Typical layout of VRF System

LEVEL 3 Air Conditioning ENERGY ASSESSORS TRAINING ANY QUESTIONS OR FEEDBACK ON ANY SLIDE Any questions or clarity needed over this topic and slides 8

Contacts:- STROMA Certification Ltd – Contacts Web Links www.stroma.com/certification Contacts:- STROMA Certification Ltd. 4 Pioneer Way, Castleford, WF10 5QU 0845 621 11 11 training@stroma.com

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