Prime Condensate Trap With Water; Purge Gas Lines; Adjustments; Set Gas Input Rate - Carrier 58MVP080 Installation, Start-Up, And Operating Instructions Manual

Table 8—Continuous Fan (CF) Airflow Setup
Switch Position
CF SETUP
CONTINUOUS
SWITCH POSITION
FAN (CFM)
CF-1 CF-2 CF-3 042040 042060 042080 060100
Default OFF OFF OFF
600 ON OFF OFF
800 OFF ON OFF
1000 ON ON OFF
1200 OFF OFF ON
1400 ON OFF ON
1600 OFF ON ON
2000 ON ON ON
X—Indicates allowable selection.
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.
1. Remove main furnace door and blower access panel.
2. Locate setup switches on the control center. (See Fig. 25.)
3. See Table 9 for setup switch description.
4. Replace main furnace door and blower access panel.
NOTE: If a bypass humidifier is used, setup switch SW-3 (BPH)
should be in ON position. This prevents nuisance limit trips caused
by the increased temperature in the return air resulting from the
bypass.
NOTE: If modulating dampers are used, setup switch SW-5 (MZ)
should be in ON position. This allows the furnace control center to
compensate for the modulating dampers. The control will re-
calibrate for the new system static conditions once every minute
while operating in the low-heat or continuous fan modes.
Table 9—Setup Switch Description
SETUP NORMAL
SWITCH NO. POSITION
SW-2 (LOW) OFF
SW-3 (BPH) OFF
SW-4 (EMER HEAT) OFF
SW-5 (MZ) OFF
SW-6 (COMP TEST) OFF
SW-7 and -8 See
(Blower Table
Off Delay) 10
ALLOWABLE FURNACE
MODEL SETUP
500 515 690 860
X X X —
X X X X
X X X X
X X X X
X X X X
— — — X
— — — X
DESCRIPTION OF USE
Turn switch to ON to lock furnace
in the low-heat mode only.
Turn switch to ON when a bypass
humidifier is used. This will com-
pensate for the higher return-air
temperature and provide 5 per-
cent more airflow in low-heat
mode only.
Turn switch to ON to bypass mi-
croprocessor control. Furnace will
operate at high heat only with
main blower and inducer motor
operating at maximum RPM. NO
safeties are bypassed.
Turn switch to ON when modulat-
ing dampers are used. In this
mode the main blower speed is
recalculated once every minute
while the furnace is in the low-
heat or continuous fan mode.
Turn switch to ON to initiate com-
ponent test. Furnace will operate
inducer motor 20 sec low speed,
20 sec high speed, HSI 15 sec,
blower 20 sec low speed, and
blower 20 sec high speed. SW-1
must be in OFF position. No ther-
mostat signal can be present for
fault history display
Adjust switches to provide desired
heating mode blower off delay
time, 90, 135, 180, or 225 sec.
Table 10—Blower Off Delay Setup Switch
DESIRED HEATING
SETUP SWITCH (SW-7 AND -8) POSITION
MODE BLOWER
OFF DELAY (SEC)
90
135
180
225
Step 3—Prime Condensate Trap With Water.
Condensate trap must be PRIMED or proper draining may not
occur. The condensate trap has 2 internal chambers which can
ONLY be primed by pouring water into the inducer drain side
of condensate trap.
1. Remove upper inducer housing drain connection cap. (See
Fig. 43.)
2. Connect field-supplied 1/2-in. ID tube to upper inducer
housing drain connection.
3. Insert field-supplied funnel into tube.
4. Pour 1 quart of water into funnel/tube. Water should run
through inducer housing, overfill condensate trap, and flow
into open field drain. (See Fig. 44.)
5. Remove funnel and tube from inducer housing and replace
drain connection cap and clamp.
Step 4—Purge Gas Lines
If not previously done, purge the lines after all connections have
been made 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. Failure to follow this warning could
result in fire, explosion, personal injury, or death.
Step 5—Adjustments

SET GAS INPUT RATE

There are 2 methods of adjusting gas input rate. The preferred
method is by using Table 11 and following instructions in item 1.
The second method is by clocking the gas meter as outlined in item
2. Item 2 must be used for altitudes above 2000 ft.
1. Determine natural gas orifice size and manifold pressure for
correct input by using Table 11.
a. Obtain average yearly heat value for local gas supply.
b. Obtain average yearly specific gravity for local gas supply.
c. Verify the furnace model. Table 11 can only be used for
model 58MVP Furnaces.
d. Find natural gas heat value and specific gravity in Table 11.
e. Follow heat value line and specific gravity line to point of
intersection to find orifice size and manifold pressure
settings for proper operation at given natural gas condition.
33
Position
SW-7 SW-8
OFF OFF
ON OFF
OFF ON
ON ON