Goodman Mfg VC8 User Manual download pdf (Page 27)

TART

ROCEDURE

AND

DJUSTMENT

The cooling system manufacturer’s instructions must be

checked for required air flow. Any electronic air cleaners or

other devices may require specific air flows, consult installa-

tion instructions of those devices for requirements.

3. Knowing the furnace model, locate the high stage cooling

air flow charts in the Specification Sheet applicable to

your model. Look up the cooling air flow determined in

step 2 and find the required cooling speed and adjustment

setting.

Example: A *MVC80704BX furnace installed with a 2.5

ton air conditioning system. The air flow

needed is 1000 CFM. Looking at the cooling

speed chart for *MVC80704BX, find the air

flow closest to 1000 CFM. A cooling airflow

of 990 CFM can be attained by setting the

cooling speed to “C” and the adjustment to

“-” (minus).

4. Continuous fan speed is 30% of the furnace’s maximum

airflow capability.

Example: If the furnace’s maximum airflow capability

is 2000 CFM, the continuous fan speed will

be 0.30 x 2000 CFM = 600 CFM.

5. Locate the blower speed selection DIP switches on the

integrated control module. Select the desired “cooling”

speed tap by positioning switches 1 and 2 appropriately.

Select the desired “adjust” tap by positioning switches

3 and 4 appropriately. Refer to the following figure for

switch positions and their corresponding taps. Verify

CFM by noting the number displayed on the dual 7-

segment LED display.

6. The multi-speed circulator blower also offers several

custom ON/OFF ramping profiles. These profiles may

be used to enhance cooling performance and increase

comfort level. The ramping profiles are selected using

DIP switches 5 and 6. Refer to the following figure for

switch positions and their corresponding taps. Refer to

the bullet points below for a description of each ramping

profile. Verify CFM by noting the number displayed on

the dual 7-segment LED display.

A* OFF OFF

BONOFF

COFFON

DONON

Switch Bank: S4

DIP Switch No.

(*Indicates factory setting)

Ramping

Profiles

• Profile A provides only an OFF delay of one (1) minute

at 100% of the cooling demand airflow.

OFF

100% CFM 100% CFM

1 min

OFF

• Profile B ramps up to full cooling demand airflow by

first stepping up to 50% of the full demand for 30 seconds.

The motor then ramps to 100% of the required airflow. A

one (1) minute OFF delay at 100% of the cooling airflow

is provided.

50% CFM

1/2 min

100% CFM

1 min

OFF

• Profile C ramps up to 85% of the full cooling demand

airflow and operates there for approximately 7 1/2

minutes. The motor then steps up to the full demand

airflow. Profile C also has a one (1) minute 100% OFF

delay.

100% CFM

OFF

AOFFOFF

BONOFF

COFFON

D* ON ON

Switch Bank: S3

Cooling

Airflow

DIP Switch No.

(*Indicates factory setting)

Normal* OFF OFF

10% ON OFF

-10% OFF ON

Normal ON ON

DIP Switch No.

(*Indicates factory setting)

Switch Bank: S3

Adjust Taps

• Profile D ramps up to 50% of the demand for 1/2 minute,

then ramps to 85% of the full cooling demand airflow

and operates there for approximately 7 1/2 minutes. The

motor then steps up to the full demand airflow. Profile D

has a 1/2 minute at 50% airflow OFF delay.

OFF

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Goodman Mfg VC8 User Manual Page 27

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