Start−Up, Adjustment, And Safety Check - International comfort products F8MVL Installation Instructions Manual

START−UP, ADJUSTMENT, AND SAFETY
CHECK
General
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
This furnace is equipped with manual reset limit
switches in the gas control area. The switches open
and shut off power to the gas valve, if a flame rollout or
overheating condition occurs in the gas control area.
DO NOT bypass the switches. Correct problem before
resetting the switches.
1. Maintain 115−v wiring and ground. Improper polarity will
result in rapid flashing LED and no furnace operation.
2. Make thermostat wire connections at the 24−v terminal
block on the furnace control. Failure to make proper con-
nections will result in improper operation. (See Figure 25 −
Figure 33)
3. Gas supply pressure to the furnace must be greater than
4.5−In. W.C. (0.16 psig ) but not exceed 14−In. W.C. (0.5
psig).
4. Check all manual−reset switches for continuity.
5. Replace blower compartment door. Door must be in place
to operate furnace.
6. Setup switch descriptions The variable speed furnace con-
trol has DIP switches to select thermostat staging, blower
off delay timings, air flow selection and other operational or
service related functions. (See Figure 26, Figure 55 and
Table 9)
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts, and servicing
furnaces.
Figure 48 − Redundant Automatic Gas Control Valve
ON/OFF SWITCH
1/2¿ NPT INLET
INLET
PRESSURE TAP
1/2¿ NPT OUTLET
441 01 2122 01
REGULATOR COVER SCREW
PLASTIC ADJUST SCREW
REGULATOR SPRING
HIGH STAGE GAS
PRESSURE REGUL ATOR
ADJUSTMENT
LOW STAGE
GAS PRESSURE
REGUL ATOR ADJUSTMENT
MANIFOLD
PRESSURE TAP A04167
Specifications are subject to change without notice.
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced
furnace life.
DO NOT redrill orifices. Improper drilling (burrs,
out−of−round holes, etc.) can cause excessive burner
noise and misdirection of burner flames. This can
result in flame impingement of heat exchangers,
causing failures. (See Figure 49)
Figure 49 − Orifice Hole
Figure 50 − Amp. Draw Check with Ammeter
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
R Y W G
10 TURNS
FROM UNIT 24-V
CONTROL TERMINALS
EXAMPLE: 5.0 AMPS ON AMMETER
10 TURNS AROUND JAWS
BURNER
ORIFICE
A93059
HOOK-AROUND
AMMETER
= 0.5 AMPS FOR THERMOSTAT
ANTICIPATOR SETTING
A96316
31