Variable Refrigeration Flow (VRF) System

Variable Refrigeration Flow (VRF) System

Unique Retrofit Application – 100 year old Hospital located in St. Louis. The HVAC system of choice was a conventional VAV system to provide individual occupant control.

Existing Unit Conversion

Existing Unit Conversion

An existing indoor unit was converted from a DX split to a chilled water system and steam heating coil.

2 Crane Job

2 Crane Job

A smaller crane was required to aid in setting up the larger crane to make the “pick”.

Condensing Unit Installaton

Condensing Unit Installaton

The final location of the LG condensing unit was on a sub roof located high on the hospital building. This would then serve part of the top floor doctor offices.

3 Pipe Heat Recovery System

3 Pipe Heat Recovery System

LG’s 3 pipe heat recovery system being installed on a sub roof which serves a section of the top floor doctor offices.

Heat Recovery Box

Heat Recovery Box

One of the heat recovery boxes shown here piped in series which eliminates the need for another “Y” fitting for the Connection of another heat recovery box down stream.

Independent Zones

Independent Zones

4 independent zones piped off of the 4 port heat recovery box. 1 – 4 port box can support 4 zones that can simultaneously be in heating or cooling mode.

Tight Space Installation

Tight Space Installation

The 2 pipes shown making sweeping turns into the ceiling cassette. The tight space between the ceiling grid and concrete beam is within inches – just large enough for the insulated refrigerant pipe.

Individual Thermostat

Individual Thermostat

Each office has it’s own individual thermostat which allows the occupant to be in heating or cooling mode regardless of the adjacent office’s mode.

AC Smart

AC Smart

LG’s AC Smart was also installed which provides the hospital’s facility department the opportunity to monitor and control all zones from one central location.

Architectural Constraints

Architectural Constraints

Some additional office space showing the interesting architectural dimensions of the space.

Ceiling Cassette

Ceiling Cassette

A finished look of a ceiling cassette located in the corridor of the office.

Vacuum

Vacuum

During the start up prior to charging the system with refrigerant – the piping network must be vacuumed down below 550 microns.

Commissioning

Commissioning

System start up and commissioning of the LG equipment are critical to a successful installation. Owner training and annual system checks are also provided as a service by RJI.

Unique Retrofit Application – 100 year old Hospital located in St. Louis.  The HVAC system of choice was a conventional VAV system to provide individual occupant control.An existing indoor unit was converted from a DX split to a chilled water system and steam heating coil.A smaller crane was required to aid in setting up the larger crane to make the “pick”.The final location  of the LG condensing unit was on a sub roof located high on the hospital building.  This would then serve part of the top floor doctor offices.LG’s  3 pipe heat recovery system being installed on a sub roof which serves a section of the top floor doctor offices.One of the heat recovery boxes shown here piped in series  which eliminates the need for another “Y” fitting for the Connection of another heat recovery box down stream.4 independent zones piped off of the 4 port  heat recovery box.  1 – 4 port box can support 4 zones that can simultaneously be in heating or cooling mode.The 2 pipes shown making sweeping turns into the ceiling cassette.  The tight space between the ceiling grid and concrete beam is within inches – just large enough for the insulated refrigerant pipe.Each office has it’s own individual thermostat which allows the occupant to be in heating or cooling mode regardless of the adjacent office’s mode.LG’s AC Smart was also installed which provides the hospital’s facility department the opportunity to monitor and control all zones from one central location.Some additional office space showing the interesting architectural dimensions of the space.A finished look of a ceiling cassette located in the corridor of the office.During the start up prior to charging the system with refrigerant – the piping network must be vacuumed down below 550 microns.System start up and commissioning of the LG equipment are critical to a successful installation.

Owner training and annual system checks are also provided as a service by RJI.