EQUIPMENT DESCRIPTION

The 2026AS400-1 ECU (Figure 1) is a lightweight, self-contained unit in a weatherproof aluminum case with a built-in heat pump designed to provide a high capacity heat-cool environmental control system. Leading particulars are listed in Table 1. The ECU will control the temperature of an adequately enclosed compartment within the variable range of 7° C to 32° C (45° F to 90° F) in ambient temperatures of -32° C to 52° C (-25° F to 125° F). The temperature is controlled by a cool-heat control thermostat (Figure 5). The ECU works as a heat pump in one of three cycles; a heating cycle, a cooling cycle, or defrosting cycle.

• The ECU is a vertical compact ECU with a nominal cooling capacity of 60,000 British Thermal Units per hour (BTU/hr). It has a nominal heating capacity of 99,000 BTU/hr with supplementary heaters, and 58,000 BTU/hr without supplementary heaters when supplied with 208-VAC, 3-phase, 50/60 Hz, 3-wire power.
  
  
• The supplemental heating unit is a two–stage assembly; each stage contains 6-KW heaters capable of dispersing a total of 41,000 BTU/hr. Over-heating protection is controlled by a 160° F (71° C) cutout (thermoguard) located in the return plenum over the indoor coil (Figure 3). The unit contains air-cooled indoor and outdoor finned tube coils.
  
  
• Supplementary heating elements are protected by two fail-safe, fuse links in each stage set to open at 306° F (152° C). The first supplemental heating stage is controlled through the second stage of the indoor thermostat (Figure 5). The second stage of supplemental heating is controlled by an outdoor thermostat (Figure 4).

  

  LEGEND:
  1. INDOOR AIR SUPPLY (TO MOBILE FACILITY)
  2. INDOOR AIR RETURN (TO ECU)
  3. OUTDOOR AIR DISCHARGE
  4. OUTDOOR AIR INTAKE – SERVICE PANELS
  5. SERVICE PANELS
  6. FRESH AIR INTAKE
  7. SLIDE CLEARANCE PANEL
  8. SIDE PANEL EXTENSION
  9. REFRIGERANT ACCESS PORTS (STANDARD SCHRADER)

  
  
  

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