402 COMFORT CONTROL LOGIC
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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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Presentation Transcript

Questions

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

  • Traditional PI

    • Calculated every two seconds

    • P = Δt

    • I = ΣΔt

      Ti

  • P + I = LOAD VALUE


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.


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


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


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


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


TWO STAGE COMPRESSOR

Y2 “ON”

LV = Load Value

LV 100

LV 110

Start INHIBIT

10 Min

Y1 “ON”

Y1 “ON”


SINGLE STAGE HEAT PUMP with AUX HEAT

W1 “ON”

W1 “OFF”

LV = Load Value

LV 100

LV 115

Start INHIBIT

10 Min

Y1 “ON”


DUAL FUEL EQUIPMENT

W1 “ON”

45 seconds cool down

LV = Load Value

LV 100

LV 125

Start INHIBIT

10 Min

Y1 “ON”

Y1 “ON”


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


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


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


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”


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

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


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


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


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


BALANCE POINTS

Outdoor Sensor Must be Installed


BALANCE POINTS

Outdoor Sensor Must be Installed



BLOWER PROFILES

PSC Motors


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


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


TWO STAGE COMPRESSORS

WARM AIR HEAT PUMP


402 Comfort Control

Heat Pump Connection Diagram


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