EWC Controls DAPC Distributed Air Pressure Controller

EWC Controls Distributed Air Pressure Controller

Description:

• The model DAPC can monitor your HVAC system static pressure and the zone damper “Open & Close” commands from your EWC® Zone Controller. 

• When the static pressure gets too high, the DAPC will modulate “Float” any Closed zone dampers towards the Open position, in order to control the static pressure. 

• Use the DAPC’s default static pressure set-point (0.5”wc) or select a set-point from the menu. 

• If preferred, customize and let the DAPC “discover” the actual “non-zoned” static pressure of your HVAC system, and adopt that value as the static pressure set-point. 

• If you don’t have enough room to install a bypass, the DAPC is your best airflow management solution.

Zone Capacity:

• Modulate 1, 2 or 3 large air zones with 24vac

• Power Open / Power Close “Floating Point” motor actuators. eg, MA-ND5 or MA-15S.

Compatible Zone Controllers:

• The DAPC is compatible with all 24vac zoning systems when genuine Ultra-Zone® model ND, URD or SID dampers are specified and installed. (MA-ND5 or MA15S motor actuators). 

Round and/or Rectangular Dampers by zone:

• All zone dampers in a building are usually the same type, either round or rectangular. 

• The DAPC can handle Round dampers on one zone and Rectangular dampers on another zone. 

• If both damper types exist on one or more zones, use the default “linear” setting rather than “round” or “rectangular”

Static Pressure Set-Point:

• The DAPC default static pressure set-point is 0.5”wc. You can select your own set-point from a wide range (.15”wc to 1.50”wc). 

• If you prefer, the DAPC can “discover” the non-zoned static pressure of your HVAC system and adopt that value as the operating static pressure set-point.

Status LCD:

• The liquid crystal display scrolls to show the HVAC system Static Pressure versus the Static Pressure Set-Point. 

• Real time damper position “Open, Closed or Floating” can be viewed by hitting the UP button.

• All DAPC programming is viewed on the LCD screen.

4 Button LCD Programming:

• Four buttons are provided below the LCD screen to access the DAPC menu, choose your settings and observe damper input and output position (status).

• Non-volatile memory will retain your menu settings even after a prolonged power failure

Damper LED’s:

• Three easy to observe LED’s labeled Zone 1, Zone 2 and Zone 3, provide “status” of which zone dampers are Open, Closed or Floating.

• Green = Open, Red = Closed, Flashing Green/Red = Floating. 

Intuitive Default Programming:

• The DAPC comes pre-loaded with Default Operating Parameters (See Page 2, Table 1) for Zoned HVAC Systems. 

• Default Programming means less work for the Installer, but still allows fine tuning to optimize performance and achieve personal preference. 

• Simply decide which “large” zones you want the DAPC to modulate “float”, when the static pressure gets too high.

Select the zones you want to modulate:

• The average zoned home has 2 or 3 zones.

• Sometimes the percentage of airflow (cfm) required for each zone is roughly the same (50/50 or 60 /40). Quite often the airflow ratios are very different (80/20, 70/30, 60 /30/10).

• Because large zones can handle periodic overflow (excess air) without over-conditioning, but small zones may not, the DAPC lets you select which zones are allowed to modulate and which cannot!

• Both zones should modulate on a (60/40 or 50/50) two zone system, but only modulate the largest zone on a (80/20) two zone system.

Specifications:

Dimensions:

Product Height (in.): 3”

Product Width (in.): 13”

Product Depth (in.): 13”

Unit Weight: 2.5 lbs.