Retrofits and New Controls: Sorting Out Some Options. Bob Davis, Ecotope. Affordable Comfort 2011 SFO. Topics. Retrofit overview Some comments on “high efficiency” equipment Newer control features. Retrofits: what are you trying to accomplish?. Consider what the “technical fix” gets you
Bob Davis, Ecotope
Affordable Comfort 2011
Field measured COP compared to laboratory and Fujitsu data.
ENTER INSTALLER SETUP
1. Press the SYSTEM key
2. PRESS and HOLD the two unmarked keys as shown until the display changes
approximately 5 seconds
Step 0170 establishes type of system and number of stages (Option 7 is two heat/1 cool heat pump; Option 12 is 3 heat/2 cool heat pump)
Step 0340 specifies there is an outdoor sensor; Option 2 must be selected to make the sensor an active control of strip heat. (Option 1 causes display of outdoor temperature but not active control of strip heat.)
Step 0360: strip heat lockout temperature (40° F)
Pro 8000 only goes to 40º F; IAQ goes lower
Only wires needed
Provides Wireless Setup instructions for the:
Wireless FocusPRO Thermostat
Portable Comfort Control
Wireless Outdoor Sensor
Connecting the Wireless FocusPRO 6000
Pair up with communicating coils (“self-identification”)
User inputs still needed (especially for things like strip heat and compressor lockout)
Sometimes there is a “failure to communicate” so make sure stat is compatible with rest of system
To enter INSTALL/SETUP menu, press ADVANCED button for 10 seconds
Follow menu prompts to either INSTALL equipment (generally used when first powering up system) or change system settings (SETUP)
When in SETUP mode for a heat pump, strip heat lockout temperature can be specified in the ELECT HEAT LOCKOUT step.
Should be within 5 percent (1-2º F) of actual outdoor temperature
But… spend some time calculating loads
And…try to make zones as equal in size (airflow requirement) as possible
Initial checkout and periodic review are essential for fine control
Does zoning save energy?
During this period the Desired Cool has been set forward 2F as this tends to be the cooler part of the day. This is a period of energy savings and will bring on the compressor if the Indoor Temp exceeds the Desired Cool set-point or if Pre-Cooling is enabled.
During the warmer period of the day, the Desired Cool is set for 80F. During these periods the compressor will cycle for a longer duration with shorter breaks between each cycle. Each cycle time and break between cycles will vary in length due to the outdoor temperature continually changing. You will notice on Aug 4th the Outdoor Temp is cooler, therefore the compressor cycle times are shorter in duration.