Sierra Fresh Air Systems
Stressing Environmental Responsibility and Sustainability

DOAS Split System - Model ZFR



  • Dedicated Outside Air System
  • Rooftop AHU with dehumidification, heating, and filtration
  • Utilizes external DX or CW cooling source
  • Integral indirect-fired heating with DHTD (patent(s) pending)
  • Includes Patented AdaptAire™ DDC controls, integrates with most building control systems
The ZFR delivers high quality outside ventilation air for comfort and Indoor Air Quality in commercial buildings, with dehumidification, heating and filtration (up to MERV15) in a split system configuration. The ZFR allows engineers to satisfy load requirements more efficiently with higher ventilation rates while permitting conventional HVAC equipment to operate as originally designed.

ZFR MODEL CFM RANGE OPTIONAL GAS HEAT MAX. MBH INPUT BASIC UNIT FOOTPRINT LxWxH AVAILABLE ARRANGEMENTS APPROVALS AVAILABLE ACCESSORIES
20 1,500-5,000 200 72"x76"x36" Horizontal ANSI, FM, IRI Inlet Hood, Flat Bank Filter Section with High Efficiency Filters, Inlet Shut-Off Damper or Mixing Dampers, and Cooling Coil Section with CW, R-22, R-410A Cooling Coils
40
3,000-9,500
400

82"x80"x50"

60 4,500-14,000 600 96"x94"x60"

Control System Application Includes:
MDT Modulating Discharge
Temperature Control
Discharge air sensor mounted in unit discharge with remote mounted 3 gang box cover including manual potentiometer to enable unit and adjust temperature setpoint, Fan On Light, Burner On Light, and Cool On Light. Additional potentiometer is provided if optional return air damper section for manual or mixed air control is ordered.
VDT-Expert Modulating Discharge Temperature Control with BACview controller allowing after hours unit enable, operating feedback, and monitoring of alarm status. Discharge air sensor mounted in unit discharge with remote mounted BACview controller to set discharge temperature setpoint and operating schedules. Service information, operating feedback, and alarm status can also be monitored.

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