Dehumidification Mode; Zone Mode; Start-Up Procedures; General - Carrier 58MVP Installation, Start-Up, And Operating Instructions Manual

AIR
AIRFLOW
CONDITIONER
(CFM)
(TONS)
1200 or
Default
2000
1-1/2 600
2 800
2-1/2 1000
3 1200
3-1/2 1400
4 1600
5 2000
X—Indicates allowable selection.
→
Step 10—Dehumidification Mode
If dehumidification input is energized with a 24-vac input, RPM
calculated for cooling and continuous fan is multiplied by 0.85 for
all furnace model sizes. This compensates for high humidity
conditions during cooling operation.
→
Step 11—Zone Mode
When setup switch SW-5 MZ is in ON position, blower motor
control is the same as above except with the following exceptions:
1. While blower is operating in either low heat or continuous fan,
the coast down calibration is performed once a minute to
update blower RPM for zone damper position changes during
a given cycle unless the blower pulse width to blower motor
is greater than 60 percent. This prevents nuisance faults from
occurring when a high continuous fan CFM has been selected.
2. While blower is operating in either high heat or cooling,
blower pulse width to blower motor is frozen when blower
RPM is within 10 percent of calculated blower RPM for 5 sec.

START-UP PROCEDURES

Step 1—General
1. Furnace must have a 115-v power supply properly connected
and grounded.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control center fault indicator light flashes
rapidly and furnace does not operate.
2. Thermostat wire connections at terminals R, W/W1, G, and
Y/Y2 must be made at 24-v terminal block on control center.
3. Natural gas service pressure must not exceed 0.5 psig (14-in.
wc), but must be no less than 0.16 psig (4.5-in. wc).
4. Blower access panel must be in place to complete 24-v
electrical circuit to furnace.
These furnaces are equipped with a manual reset limit switch
in burner box. This switch opens if an overheat condition
(rollout) occurs in burner enclosure. Correct inadequate
combustion-air supply or improper venting condition and
reset switch. DO NOT jumper this switch.
Before operating furnace, check each manual reset switch for
continuity. If necessary, press button to reset switch.
Step 2—Select Setup Switch Positions
AIR CONDITIONING (A/C) SETUP SWITCHES
The air conditioning setup switches are used to match furnace
airflow to the cooling unit used. This furnace will provide 400
CFM per selected air conditioning tonnage.
To set the desired cooling airflow:
Table 7—Air Conditioning (A/C) Airflow Setup Switch Position
A/C SETUP
SWITCH POSITION
A/C-1 A/C-2 A/C-3
OFF OFF OFF
ON OFF OFF
OFF ON OFF
ON ON OFF
OFF OFF ON
ON OFF ON
OFF ON ON
ON ON ON
ALLOWABLE FURNACE MODEL SETUP
040-14 060-14 080-14
3 Tons 3 Tons 3 Tons
1200 CFM 1200 CFM 1200 CFM
X X
X X
X X
X X
X X
— —
— —
1. Remove main furnace door and blower access panel.
2. Locate the A/C setup switches on the control center. (See Fig.
25.)
3. Determine the air conditioning tonnage used.
4. Use Table 7 or wiring schematic to determine the proper setup
position of A/C switches. (See Fig. 23 and 43.)
Fig. 43—Example Setup Switch in OFF Position
NOTE: Excessive airflow caused by improper A/C switch setup
may cause condensate blow off in the cooling mode.
5. Replace main furnace door and blower access panel.
NOTE: EAC-1 terminal is energized whenever the blower oper-
ates. HUM terminal is only energized when the gas valve is
energized.
CONTINUOUS FAN (CF) SETUP SWITCHES
The CF setup switches are used to select desired airflow when the
thermostat is in the continuous fan mode. This setup feature will
allow the continuous fan airflow to be adjusted. To set the desired
continuous fan airflow:
1. Remove main furnace door and blower access panel.
2. Locate the CF setup switches on the control center. (See Fig.
25.)
3. Determine the desired continuous fan airflow.
4. Use Table 8 or wiring schematic to determine the proper setup
position of CF switches. (See Fig. 23 and 43.)
NOTE: The CF switches are factory set to provide the continuous
fan airflow equal to the low-heat mode.
5. Replace main furnace door and blower access panel.
SETUP SWITCHES (SW)
The control center has 8 setup switches that may be set to meet the
application requirements. Position these setup switches for the
appropriate requirement.
33
→080-20
100-20
5 Tons 5 Tons
2000 CFM 2000 CFM
X — —
X X X
X X X
X X X
X X X
— X X
— X X
1
OFF
→120-20
5 Tons
2000 CFM
—
X
X
X
X
X
X
A95198