Start-Up Procedures; Adjustments; Set Gas Input Rate - Carrier 58UHV Installation, Start-Up, And Operating Instructions Manual

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FURNACE
SIZE
Red Wire
060
080
100
120
*Use listed jumper position combinations only.
†Within ± 2°F
CFM per ton is the airflow used to attain the best efficiency
with these units. 315 CFM per ton is the airflow used for
improved dehumidification and/or with undersized ducts.
Additional humidity control can be attained by using a
humidistat (see Set-up Procedures section, item 4.).
c. The ORANGE jumper wire selects airflow for cooling-only
(AC) or heat pump heating and cooling, and selects heat
pump heating best efficiency (HP EFFY) or enhanced
comfort (HP CMFT). HP EFFY provides the same heating
airflow as used for cooling. HP CMFT reduces the heating
airflow to 90% of the cooling airflow for a higher air
temperature rise and better comfort.
3. Continuous-fan
The GREEN jumper wire selects the airflow CFM for
continuous-fan. LO provides 50% of the airflow used for
single-speed cooling or 2-speed cooling. MED provides 65%
of cooling airflow. HI provides 100% of cooling airflow for
continuous-fan operation.
NOTE: If HI is selected with a 2-speed cooling or heat pump
system, the airflow will remain at 100% of high-cooling/heating
when the system is in low-cooling and heat pump low-heating
mode. Continuous-fan selection has no effect on gas-heating
airflow.
4. As an alternative to selecting 315 CFM per ton for cooling
airflow, an active dehumidification mode can be invoked by
connecting a humidistat in series with the GREEN wire
marked DEHUM connected to the 1/4 quick-connect terminal
at G on the furnace control. The humidistat contacts should
open on a rise in humidity. When the humidistat contacts
open, the airflow will be reduced to 80% of the selected
airflow, except that this airflow will not be reduced to less
than 280 CFM per ton.
NOTE: When a humidistat is calling for reduced airflow and the
thermostat is satisfied, the blower will not operate on the
continuous-fan LOW setting to prevent re-evaporation of conden-
sate at the evaporator coil. When continuous-fan MED or HI
setting is selected, normal airflow will be reduced to 80%.

START-UP PROCEDURES

1. Component test—The furnace features a component test
system to help diagnose a system problem in the case of a
component failure. To initiate the component test procedure,
ensure that there are no thermostat inputs to the control and all
Table 8—Gas Heat Airflow—Nominal CFM (With Filter)
GAS HEAT
TEMP RISE*
Jumper Position
Violet Wire
HI A
M-HI A
MID D
HI A
M-HI A
MID D
HI A
M-HI A
MID D
HI A
M-HI A
MID D
GAS HEAT
TEMP RISE (°F)†
High-Stage Low-Stage
51 45
46 38
40 30
58 44
51 39
45 29
51 44
45 39
40 30
69 49
59 43
55 40
time delays have expired. Short the TWIN/TEST terminal to
ground or C
OM
NOTE: The component test feature will not operate if the control
is receiving any thermostat signals or until all time delays have
expired. The ICM2+ blower motor speed ramp-up will slightly
delay blower response times.
The component test sequence is as follows:
a. The furnace control checks itself, operates the inducer
motor on low speed for 7 sec and on high speed for 7 sec,
then stops.
b. The hot surface ignitor is energized for 15 sec, then
de-energized.
c. The blower motor operates at continuous-fan airflow for 7
sec.
d. The blower motor operates at high-gas heat airflow for 7
sec. The gas valve and humidifier terminal HUM are not
energized for safety reasons.
e. The blower motor operates at single-speed cooling/heat
pump heating airflow (or 2-speed heat pump high-
heat/high-cooling) for 7 sec, then stops.
NOTE: The EAC terminals are energized when the blower is
operating.
2. After all connections have been made, purge gas lines and
check for leaks.
Never purge a gas line into a combustion chamber. Never use
matches, candles, flame, or other sources of ignition for the
purpose of checking leakage. Use a soap-and-water solution
to check for leakage. A failure to follow this warning can
cause a fire, explosion, personal injury, or death.
3. To operate furnace, follow procedures on operating instruc-
tions label attached to furnace.
4. With furnace operating, set thermostat below room tempera-
ture and observe that furnace goes off. Set thermostat above
room temperature and observe that furnace restarts.

ADJUSTMENTS

1. Set gas input rate.

15
GAS HEAT
AIRFLOW (CFM)
High-Stage Low-Stage
925
1085
1250
970
1140
1310
1430
1685
1935
1330
1560
1720
24V for 1 to 4 sec. (See Fig. 13.)
615
730
1135
790
925
1395
1035
1215
1630
1240
1460
1605