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402 COMFORT CONTROL LOGIC

402 COMFORT CONTROL LOGIC. Questions. SUB BASE. Up to 16 wires may be required. AUTO CHANGEOVER. IF IDT ≥ 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). LOAD VALUE. Control reacts to LOAD VALUE

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402 COMFORT CONTROL LOGIC

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  1. 402 COMFORT CONTROL LOGIC

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

  3. AUTO CHANGEOVER • IF IDT ≥ 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 Maximum LV Limits are set by HVAC Configuration INCREASED DEMAND Calculated Every Two Seconds Stage 1 Stage 2 Stage 3 Stage 4 Stage 5 0 100 200 300 400+ LV = Load Value

  8. MULTI STAGE THRESHOLD • Dead Band @ LV Threshold • to avoid cycling around LV Increased Demand LV 0-110 1st Stage LV >111 2nd Stage Decreased Demand LV >100 2nd Stage LV 99-0 1st Stage 10 Minute INHIBIT once Threshold is Crossed

  9. MULTI STAGE INHIBIT Cross LV Dead Band & Initiate10 Minute INHIBIT (Does not apply to W1 to W2) Begin INHIBIT - HP to Dual Fuel Begin INHIBIT - HP to W1 Begin INHIBIT - Y1 to Y2 Stage 1 Stage 2 Stage 3 0 110 115 125 200 LV = Load Value

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

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

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

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

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

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

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

  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. BLOWER PROFILES PSC Motors

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

  26. WET HEAT Single Stage Wet Heat PSC MotorVAR SP Motor LV ≤ 100 W1 cycled based on LV W1 on, Airflow adjusted based on LV PSC BK Disabled - ISU # 11 VARIABLE SPEED BK Enabled - ISU # 11 Two Stage Wet Heat PSC MotorVAR SP Motor LV < 100 W1 cycled based on LV W1 on, Airflow adjusted based on LV LV > 100 W1 On, W2 cycle based on LV W1 On, Airflow set to 100%, W2cycled based on LV

  27. TWO STAGE COMPRESSORS WARM AIR HEAT PUMP

  28. 402 Comfort Control Heat Pump Connection Diagram

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