Carrier DIRECT VENT 4 58HDV - Manual (Page 44)

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To check temperature rise,use the following procedure:
1. Place thermometers in supply and return air registers as close
to furnace as possible, avoiding direct radiant heat from heat
exchangers.
2. Operate furnace on High Heat for 10 minutes with all the
registers and duct dampers open by using a jumper wire on
R to W1 and W2 thermostat connections on the furnace
control board.
Note: The SW1 DIP switch #3 should be in the on position.
(See furnace wiring diagram)
3. Take readings and compare with range specified on rating
plate.
4. If the temperature rise is not in the correct range, the blower
speed must be changed. A higher blower speed will lower
the temperature rise. A lower blower speed will increase the
temperature rise.
5. Repeat steps 2 thru 4 with the furnace operating on Low
Heat for 10 minutes by using a jumper wire on the R to W1
thermostat connections on the furnace control board.
6. Remove the jumper wire after the adjustments are complete.
Return SW1 DIP switch #3 to previous setting.
Blower Adjustments
Changing Blower Speed
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Turn OFF power to furnace before changing blower speed.
!
WARNING
NOTE: The blower speeds that the manufacturer sets from the
factory for this product are based on a nominal 400 CFM (189 L/s)
per ton cooling and the mid range on the temperature rise for
heating.
Since the manufacturer cannot predict the static pressure that
will be applied to the furnace, it is the responsibility of the
installing dealer/contractor to select the proper speeds for the
application when the furnace is installed.
If it is necessary to change speeds, refer to steps below.
1. The 115 VAC power supply to the furnace must be turned
OFF before making adjustments to the motor.
NOTE: Allow at least 1 minute before restoring power to
the furnace after making Blower Control changes.
2. The heating, cooling and continuous blower speeds can be
adjusted by changing the SW2 DIP switch settings that are
located on the Tap Select Interface Board (See Fig. 54).
S Switches #1 and #2 adjust the continuous blower speeds.
Switches #3 and #4 adjust the heating speed.
Switches #5 and #6 adjust the cooling speed.
Switches #7 and #8 adjust the cooling speed on/off delay
profiles. See the “Technical Support Manual” for the
switch settings for the desired airflow rates for the
installation.
The jumper J1 is used to slightly increase (+) or decrease
(--) or not change (NOM) the blower speed selected from
SW2. J1 effects BOTH cooling and heating airflow.
S Continuous blower selection DIP 10 and 11 will cause
the blower to run in high cooling speed for all low
cooling (Y1) calls. Continuous blower DIP settings of 00
and 01 will allow low cooling (Y1) calls to operate
normally.
Continuous- Fan using “G”
Energizing the ”G” terminal on the furnace control board provides
continuous fan operation. This is done by connecting the G
terminal of the thermostat to the G terminal on the furnace control
board. When the FAN switch is turned from auto to ON the fan
will operate continuously at airflow selected by DIP SW2 switch #1
and DIP SW2 switch #2. EAC will be energized in this mode.
NOTE: In heating, the fan will not turn off during furnace ignition
and warm up.
Hard Wired Continuous Fan Operation
Not available for variable speed models.
FURNACE MAINTENANCE
FIRE, EXPLOSION, OR CARBON MONOXIDE
HAZARDS
Failure to follow this warning could result in personal injury,
death and/or property damage.
It is recommended that the furnace be inspected and serviced
on an annual basis (before the heating season) by a qualified
service technician.
!
WARNING
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Before servicing, disconnect all electrical power to furnace.
When servicing controls, label all wires prior to disconnecting.
Reconnect wires correctly.
Verify proper operation after servicing.
!
WARNING
See “User’s Information Manual” and the “Service
Manual”.
58H
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