Residential · Berkeley, CA
Virginia St, Berkeley: three-floor ducted heat pump with ERV and wildfire filtration (in progress)
Underway: a Berkeley remodel and addition with one Mitsubishi Smart Multi heat pump feeding three ducted units on three floors, a Zehnder ERV, and MERV 16 plus wildfire filtration.
This Berkeley remodel and addition, being built with the general contractor, puts heating, cooling, fresh air and filtration on all three floors. One Mitsubishi Smart Multi outdoor unit feeds a branch box and three ducted indoor units, one per floor. Distribution is rigid sheet metal: the lower 2-ton air handler's supply trunk is built on Unistrut, mastic-sealed and painted. A Zehnder ComfoAir Q450 ERV brings in balanced fresh air through 4 supply and 5 exhaust points, and AprilAire MERV 16 and Camfil GlidePack filters handle smoke season.
- Type
- High-End Residential Remodel
- Client
- General contractor-led project
- System
- Mitsubishi Smart Multi 4-ton heat pump, three ducted indoor units, Zehnder ERV, MERV 16 filtration
- Location
- Berkeley, CA
Scope
- — Mitsubishi MXZ-SM48NL Smart Multi outdoor unit with a PAC-LMA30BC branch box
- — Three ducted indoor units, one per floor: SVZ-AP24NL and SVZ-AP12NL air handlers and a PEAD-AA12NL ceiling-concealed unit
- — Rigid sheet-metal ductwork with insulation, dampers, grilles and registers
- — Custom linear diffuser plenum
- — Zehnder ComfoAir Q450 ERV with 4 supply and 5 exhaust points
- — AprilAire MERV 16 filtration and Camfil GlidePack wildfire filtration
- — Refrigerant piping, condensate and control wiring
- — Field changes: relocated returns, a stairwell return and a relocated kitchen hood exhaust
- — Startup and commissioning
Constraints
- — Remodel and addition with new construction tied into the existing house, coordinated with the general contractor
- — Refrigerant piping and control wiring rerouted from the crawlspace to the exterior because of concrete and existing conditions
- — Returns relocated through floor framing using an engineer-approved strap detail
- — Sequenced around the general contractor's trenching and framing
3rdGen's Role
3rdGen designed the heat pump, ventilation and filtration systems, builds the sheet-metal distribution, and installs and commissions everything in coordination with the general contractor.
Outcome
In progress. When finished, all three floors will have zoned heat pump heating and cooling, continuous balanced fresh air and high-MERV filtration for wildfire smoke.
Photography
