VRF/VRV Systems

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Important Notes on Selection of Various Central Split Systems

Generally, central split systems, abbreviated as VRF, MULTIV, VRV, or GHP, consists of an external condenser (which are usually installed on the roof) and a number of internal panels. It is possible to select split panel type and adjust temperature in each area of the building.

Central split system or VRF is usually used in large buildings and commercial centers.

Source of energy for this equipment can be three-phase power or utility gas depending on type or brand of the equipment.

Since SCROLL variable speed compressor and variable speed fan drive are used in central split system condensers, coefficient of performance (COP) is remarkably increased (about 4) and therefore this equipment can generate more heating/cooling with smaller energy consumption.

Today, in new central split systems (4th generation) in addition to improvement of the cooling unit, energy consumption, and required control systems, an energy absorption fluid is used as the middle fluid in order to provide continuous heating.

Challenges of Selecting Central Split System (VRF or VRV):

  • High cost of 100% heating system or complete heat pump in VRF or VRV

  • External condensers with suitable capacity for unit apartments are not available and using larger condensers results in increased power consumption cost

  • High cost of joints, three-way distribution joints, and copper pipes, which sometimes cost up to 25% of the initial price of the system

  • Invisibility of the gas leaking from the copper pipe network distributed across the building and necessity of using gas detector to detect the potential leakage of coolant gas from the system

  • The coolant gas may freeze in winter time in heat exchanger of the system (except for 4th generation VRFs or VRVs)

vrf system

Generally, central split VRF or VRV systems are suitable for places where 100% heating is not needed, especially during the night (due to high cost of 100% heating system and high cost of electrical ...

Important Notes on Selection of Various Central Split Systems

Generally, central split systems, abbreviated as VRF, MULTIV, VRV, or GHP, consists of an external condenser (which are usually installed on the roof) and a number of internal panels. It is possible to select split panel type and adjust temperature in each area of the building.

Central split system or VRF is usually used in large buildings and commercial centers.

Source of energy for this equipment can be three-phase power or utility gas depending on type or brand of the equipment.

Since SCROLL variable speed compressor and variable speed fan drive are used in central split system condensers, coefficient of performance (COP) is remarkably increased (about 4) and therefore this equipment can generate more heating/cooling with smaller energy consumption.

Today, in new central split systems (4th generation) in addition to improvement of the cooling unit, energy consumption, and required control systems, an energy absorption fluid is used as the middle fluid in order to provide continuous heating.

Challenges of Selecting Central Split System (VRF or VRV):

  • High cost of 100% heating system or complete heat pump in VRF or VRV

  • External condensers with suitable capacity for unit apartments are not available and using larger condensers results in increased power consumption cost

  • High cost of joints, three-way distribution joints, and copper pipes, which sometimes cost up to 25% of the initial price of the system

  • Invisibility of the gas leaking from the copper pipe network distributed across the building and necessity of using gas detector to detect the potential leakage of coolant gas from the system

  • The coolant gas may freeze in winter time in heat exchanger of the system (except for 4th generation VRFs or VRVs)

vrf system

Generally, central split VRF or VRV systems are suitable for places where 100% heating is not needed, especially during the night (due to high cost of 100% heating system and high cost of electrical power consumed by the 100% heat pump), and the central split system is used to cool/heat the building as an uninterrupted space and there is no need to separate operation costs for various units (like hotels in southern region of the country and office buildings, commercial centers, shopping centers, and luxury malls in different countries.

vrf system

If the central split system (except for 4th generation VRF) is used in regions with cold winters, the coolant might freeze in heat exchanger of the system during cold seasons of the year.

Maximum height between the central condenser and the lowest split is about 100m; maximum gap between central condenser and the furthest split panel is about 200m, and maximum length of the piping system is about 1000m.

vrf system

Each external condenser, which usually has a capacity of 8HP-20HP, can be grouped with other condensers in form of zoning the interior spaces in order to increase the system capacity to be used in larger buildings. Usually, capacity of the external panels is considered 30% more than the calculated capacity to compensate efficiency of the system reduced by the piping distance.

In VRF/VRV Systems group on DamaTajhiz reference site, that is the first (Since 2004) and the most well-known professional HVAC equipment shopping website in Middle East (According to Alexa global website) , dear all valued customers can purchase their order with the full assurance of the quality, warranty, delivery time and best prices to be processed by DamaTajhiz experts by email address: ceo@damatajhiz.com or phone number: (+98) 2186071809

Placing an Order and Warranties for VRF/VRV Systems :

  • Offering best price guarantee for all products, the prices for VRF/VRV Systems presented by DamaTajhiz are up-to-date and discount-included (see Best Price Guarantee at DamaTajhiz.com).
  • At DamaTajhiz.com, we provide all the information you need, as well as guaranteed unbeatable prices, for several models of VRF/VRV Systems from reliable manufacturers, with original warranties, to bring you the thrill of an ideal, intelligent purchase.

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Since 2003, DamaTajhiz Online Store has been active in the supply of all types of heating, ventilation, and air conditioning (HVAC) equipment by management of Mr. Majid Zavvarian to meet needs of construction projects and consumers in the Middle East.

Investigating new methods of e-commerce and looking ahead to the future, DamaTajhiz Online Store designed its way of success as the first startup for selling installation equipment in Iran and the Middle East in 2004 by launching the most comprehensive specialized shopping website for all types of heating, ventilation, and air conditioning (HVAC), pool, sauna, and spa bath equipment.


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