Download - 402 COMFORT CONTROL LOGIC
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402 COMFORT CONTROL LOGIC
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Questions
SUB BASE
Up to 16 wires may be requiredUp to 16 wires may be required
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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)
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LOAD VALUE
• Control reacts to LOAD VALUE
• Traditional PI– Calculated every two seconds– P = Δt– I = ΣΔt Ti
• P + I = LOAD VALUE
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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.
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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
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LOAD VALUE & STAGING
3002000 100 400+
LV = Load Value
Calculated Every Two Seconds
INCREASED DEMAND
INCREASED DEMAND
Stage 1 Stage 2 Stage 3 Stage 4
Maximum LV Limits
are set by
HVAC Configuration
Stage 5
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MULTI STAGE THRESHOLD
• Dead Band @ LV Threshold – to avoid cycling around LV
Increased Demand LV 0-110 1st StageLV >111 2nd Stage
Decreased Demand LV >100 2nd StageLV 99-0 1st Stage
10 Minute INHIBIT once Threshold is Crossed
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2000 110
Stage 1 Stage 2
Cross LV Dead Band & Initiate10 Minute INHIBIT
(Does not apply to W1 to W2)
Stage 3
115 125
LV = Load Value
Begin INHIBIT - Y1 to Y2
Begin INHIBIT - HP to W1
Begin INHIBIT - HP to Dual Fuel
MULTI STAGE INHIBIT
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TWO STAGE COMPRESSOR
Y1 “ON”
Start INHIBIT
Y2 “ON”
10 Min
LV = Load Value
LV 110
Y1 “ON”
LV 100
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Y1 “ON”
Start INHIBIT
10 Min
LV = Load Value
LV 115LV 100
SINGLE STAGE HEAT PUMP with AUX HEAT
W1 “ON” W1 “OFF”
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Y1 “ON”
Start INHIBIT
10 Min
LV 125
Y1 “ON”
DUAL FUEL EQUIPMENT
W1 “ON” 45 seconds cool down
LV 100
LV = Load Value
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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
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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
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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
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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”
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$
10 Min
Set PointIDT
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
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$
10 Min
Set PointIDT
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
Y Y2 or W1
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$
Set PointIDT
>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 EnabledY Y2 or W1
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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
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BALANCE POINTS
Outdoor Sensor Must be Installed
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BALANCE POINTS
Outdoor Sensor Must be Installed
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BLOWER PROFILES
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BLOWER PROFILES
PSC Motors
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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
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WET HEAT
Single Stage Wet Heat
PSC Motor VAR SP MotorLV ≤ 100 W1 cycled based on LV W1 on, Airflow adjusted based on LV
Two Stage Wet Heat
PSC Motor VAR SP MotorLV < 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%, W2 cycled based on LV
PSC
BK Disabled - ISU # 11VARIABLE SPEED
BK Enabled - ISU # 11
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TWO STAGE COMPRESSORS
WARM AIR HEAT PUMP
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402 Comfort Control
Heat Pump Connection Diagram