1. 402 COMFORT CONTROL LOGIC

2. Questions SUB BASE Up to 16 wires may be required

3. AUTO CHANGEOVER IFIDT ≥ CSP (minus 1) then: –COOLING MODE –( SP = 75, COOL MODE to 74) IF IDT < HSP then: –HEATING MODE –(Dead Band factory set to 3 degrees)

4. LOAD VALUE Control reacts to LOAD VALUE Traditional PI –Calculated every two seconds –P = Δt –I = ΣΔt Ti P + I = LOAD VALUE

5. LOAD VALUE & STAGING LV determines –TURN ON threshold for each stage –TURN OFF threshold for each stage LV of 5 to turn ON –5 minute Min OFF time for CLG –1 minute Min OFF time for HTG Max LV limits are set by HVAC config.

6. LOAD VALUE & STAGING CLG 0-100 Single Stage Compressor 0-200 Two Stage Compressor HTG 0-100 Single Stage HP or Furnace 0-200 Two Stage HP or Furnace 0-200 Single Stage HP + 1 Stage Indoor Heat 0-300 Single Stage HP + 2 Stage Indoor Heat 0-400 Single Stage HP + 3 Stage Indoor Heat 0-300 Two Stage HP + 1 Stage ID Heat 0-400 Two Stage HP + 2 Stage ID Heat 0-500 Two Stage HP + 3 Stage ID Heat

7. LOAD VALUE & STAGING 3002000100400+ LV = Load Value Calculated Every Two Seconds INCREASED DEMAND Stage 1Stage 2Stage 3Stage 4 Maximum LV Limits are set by HVAC Configuration Stage 5

8. MULTI STAGE THRESHOLD Dead Band @ LV Threshold – to avoid cycling around LV Increased DemandLV 0-1101 st Stage LV >1112 nd Stage Decreased DemandLV >1002 nd Stage LV 99-01 st Stage 10 Minute INHIBIT once Threshold is Crossed

9. 2000110 Stage 1Stage 2 Cross LV Dead Band & Initiate10 Minute INHIBIT (Does not apply to W1 to W2) Stage 3 115125 LV = Load Value Begin INHIBIT - Y1 to Y2 Begin INHIBIT - HP to W1 Begin INHIBIT - HP to Dual Fuel MULTI STAGE INHIBIT

10. TWO STAGE COMPRESSOR Y1 “ON” Start INHIBIT Y2 “ON” 10 Min LV = Load Value LV 110 Y1 “ON” LV 100

11. Y1 “ON” Start INHIBIT 10 Min LV = Load Value LV 115 LV 100 SINGLE STAGE HEAT PUMP with AUX HEAT W1 “ON” W1 “OFF”

12. Y1 “ON” Start INHIBIT 10 Min LV 125 Y1 “ON” DUAL FUEL EQUIPMENT W1 “ON” 45 seconds cool down LV 100 LV = Load Value

13. MULTI STAGE INHIBIT If IDT is ½° or less from Set Point, the next stage is always INHIBITED regardless of LV IDT SP 1/2° INHIBIT 2nd stage Cooling 1/2° SP INHIBIT 2nd stage Heating

14. LV CLAMP MAX OVERSHOOT = 2.5° F Turns system “OFF” regardless of LV System will turn back “ON” 3/4° from SP Provided Min OFF Time has elapsed Provided LV is still present Max Overshoot not enforced during DROOP

15. COOLING DROOP Set Point is satisfied (No-load or light load condition) Time OFF satisfied IDT < Droop OVERSHOOT limit to start DROOP “ON” cycle Standard DROOP = 1 degree OVERSHOOT Enhanced DROOP = 2 degree OVERSHOOT Fan delay-to-OFF is cancelled Var Sp: Blower speed set to 80% (BK= 70% PWM) Minimum ON = 8 minutes Minimum OFF = 20 minutes

16. SET POINT CHANGES Temperature Display Rounds to Nearest Whole Number Room Sensor can Discern 10 ths of a Degree – –Used to Calculate Temp Difference from SP Large Changes in SP will Freeze LV until New SP is Reached to Avoid Overshoot –“Snap Shot & Roll Back”

17. $ 10 Min Set Point IDT 5° New Set Point 4°= AUX HT 3°= No AUX HT Recovering IDT ENERGY SAVINGS MODE Rate of Recovery can increase INHIBIT Only applies to Y1 to Y2 or HP to W1 Recovery Delta must be 1.25° to INHIBIT Distance to New SP divided by 4 is the Recovery Delta Y2 or W1Y

18. $ 10 Min Set Point IDT 10° New Set Point 8°= AUX HT 7°= No AUX HT Recovering IDT ENERGY SAVINGS MODE Rate of Recovery can increase INHIBIT Only applies to Y1 to Y2 or HP to W1 Recovery Delta must be 2.5° to INHIBIT Distance to New SP divided by 4 is the Recovery Delta YY2 or W1

19. $ Set Point IDT >2° New Set Point Recovering IDT ENERGY SAVINGS MODE Aggressive Recovery will cancel INHIBIT Only applies to Y1 to Y2 or HP to W1 NO INHIBIT ISU # 35 Enabled YY2 or W1

20. HUMIDISTAT OPERATION RH control with external Humidistat connected to input terminals H1 and H2 In COOLING MODE Open signal triggers: Compressor “ON” cycle time is extended by 2 minutes Fan “OFF” delay is cancelled PSC motors “ON” delay calculated by previous “OFF” time Fan CFM reduced by 20% -Variable Speed – if Room Temp is within 2º of SP

21. BALANCE POINTS Outdoor Sensor Must be Installed

22. BALANCE POINTS Outdoor Sensor Must be Installed

23. BLOWER PROFILES

24. PSC Motors

25. BLOWER PROFILES When ODT is below 87° F, Variable Speed Airflow is Reduced to 80% WET HEAT VAR SP 0-90sec at 35% Airflow PSC and VAR SP Motors

26. WET HEAT Single Stage Wet Heat PSC MotorVAR SP Motor LV ≤ 100W1 cycled based on LVW1 on, Airflow adjusted based on LV Two Stage Wet Heat PSC MotorVAR SP Motor LV < 100W1 cycled based on LVW1 on, Airflow adjusted based on LV LV > 100W1 On, W2 cycle based on LVW1 On, Airflow set to 100%, W2 cycled based on LV PSC BK Disabled - ISU # 11 VARIABLE SPEED BK Enabled - ISU # 11

27. TWO STAGE COMPRESSORS WARM AIR HEAT PUMP

28. 402 Comfort Control Heat Pump Connection Diagram