Carrier 59SP6A Installation, Start-Up, Operating, Service And Maintenance Instructions page 59

59SP6A: Installation, Start-up, Operating, Service and Maintenance Instructions
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in:
- Overheating the heat exchangers or condensing flue gases in
heat exchanger areas not designed for condensate.
- Shortened furnace life
- Component damage.
Temperature rise must be within limits specified on furnace rating plate.
Recommended operation is at midpoint of rise range or slightly above.
This furnace must operate within the temperature rise ranges specified
on the furnace rating plate. Determine the air temperature as follows:
1. Place thermometers in return and supply ducts as near furnace as
possible. Be sure thermometers do not see heat exchanger so that
radiant heat does not affect readings. This practice is particularly
important with straight-run ducts.
2. When thermometer readings
temperature from supply-air temperature to determine air
temperature rise.
a. Check gas input for heat operation.
b. Check derate for altitude, if applicable.
c. Check all return and supply ducts for excessive restrictions
causing static pressure greater than 0.5-In. W.C.
d. Ensure Comfort/Efficiency SW1-4 on furnace control is in
OFF=Efficiency position when a bypass humidifier is used. See
Fig. 39 for switch location.
e. Verify correct model plug is installed.
f. Turn thermostat down below room temperature and remove
blower access door.
g. To increase heating airflow, set Comfort/Efficiency SW1-4 of
furnace control to OFF=Efficiency position.
h. Careful not to put tension on any wire connections
i. Repeat steps a through e.
j. When correct input rate and temperature rise is achieved, turn
gas valve ON/OFF switch to OFF.
Adjust Blower Off Delay (Heat Mode)
If desired, the main blower off time delay period may be lengthened or
shortened when operating in the heating mode to provide greater
comfort.
Table 19 – Blower Off Delay Setup Switch
DESIRED HEATING MODE
BLOWER OFF DELAY (SEC.)
90
120
150
180
Turn Dip switch SW-7 or SW-8 ON or OFF for desired blower off delay.
(See Table 19 and Fig. 39, 61 and 62)
Adjust Cooling Airflow
The ECM blower can be adjusted for a range of airflows for low-speed
or high-speed cooling. See Table 9
and Fig. 61 – Furnace Setup Switches and Descriptions. Depending on
the model size, the cooling airflow can be adjusted from 1.5 to 5.5 tons
based on 350 CFM per ton.
The high-speed or single-speed cooling airflow is adjusted by turning
Setup switches SW2-6, SW2-7 and SW2-8 either ON or OFF. Select the
required airflow from Table 9.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
stabilize, subtract
SETUP SWITCH
(SW1-7 AND -8)
POSITION
SW1-7 SW1-8
OFF OFF
ON OFF
OFF ON
ON ON
– Air Delivery – CFM (With Filter)
Table 9 is based upon 350 CFM per ton.
For other CFM per ton Setup switch selections, see
Fig. 75.
The Continuous Fan airflow selection via Setup switches SW2 is also the
airflow for low-speed cooling when the furnace is used with a 2-speed
cooling or heat pump unit. Adjust SW2-3, 4, 5 to match the airflow
required for low-speed cooling. Select the required airflow from
and Fig. 61.
NOTE: The airflow selected via SW2-3, 4, 5 (Low-Speed Cooling
Airflow) cannot exceed the airflow selected via SW2-6, 7, 8
(High-Speed Cooling Airflow). For other CFM per ton Setup switch
selections, see Fig. 39
For a complete explanation of cooling airflow, refer to the section titled
"Sequence of Operation."
Adjust Continuous Fan Airflow
(and Low-Speed Cooling Airflow)
Adjust continuous fan and low-stage cooling airflow using SW2-3, 4, 5
and refer to Fig.
a conventional thermostat using the continuous fan speed select
function. Changing the continuous fan speed at a conventional
return-air
thermostat DOES NOT change the low-speed cooling airflow selected
via SW2 at the control board.
Refer to the section titled "Continuous Blower Speed Selection for
Thermostat."
Adjust Thermostat Heat Anticipator
1. Mechanical thermostat. Set thermostat heat anticipator to match the
amp. draw of the electrical components in the R-W circuit.
Accurate amp. draw readings can be obtained at the wires normally
connected to thermostat subbase terminals, R and W. The
thermostat anticipator should NOT be in the circuit while
measuring current.
a. Remove thermostat from subbase or from wall.
b. Connect an amp. meter as shown in
subbase terminals or R and W wires at wall.
c. Record amp. draw across terminals when furnace is in heat and
after blower starts.
d. Set heat anticipator on thermostat per thermostat instructions and
install on subbase or wall.
e. Install blower door.
2. Electronic thermostat: Set cycle rate for 3 cycles per hr.
EXAMPLE:
Fig. 67 – Amp. Draw Check with Ammeter
59
and Fig. 61.
61. The continuous fan speed can be further adjusted at
Fig. 67
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
HOOK-AROUND
AMMETER
R Y W G
10 TURNS
FROM UNIT 24-V
CONTROL TERMINALS
= 0.5 AMPS FOR THERMOSTAT
5.0 AMPS ON AMMETER
10 TURNS AROUND JAWS ANTICIPATOR SETTING
Fig. 39, Fig. 61 and
Table 9
across the R and W
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