Bryant 830CA, Установка, запуск, эксплуатация, техническое обслуживание и ремонт

Страница: 25 / 44

25
START--UP, ADJUSTMENT, AND SAFETY
CHECK
General
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/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 inadequate combustion air supply
problem before resetting the switches.
!
WARNING
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.
CAUTION
!
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 Fig. 24)
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. Install blower compartment door. Door must be in place to
operate furnace.
6. Replace outer door.
Start--Up Procedures
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could cause personal injury,
death and/or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically for
the detection of leaks to check all connections. A fire or
explosion may result causing property damage, personal
injury or loss of life.
!
WARNING
1. Purge gas lines after all connections have been made.
2. Check gas lines for leaks.
3. To Begin Component Self--Test:
Remove Blower Access Door. Disconnect the thermostat
R lead from furnace control board. Manually close blower
door switch. Turn Setup DIP switch SW1--6 ON. (See Fig.
23, 45 and Table 10)
NOTE : The furnace control allows all components, except the
gas valve, to be run for short period of time. This feature helps
diagnose a system problem in case of a component failure.
Component test feature will not operate if any thermostat signal is
present at the control.
Refer to service label attached to furnace or See Fig. 38.
Component test sequence is as follows:
a. Inducer motor turns on at 50% duty cycle for 15 secs,
then stays on for the entire test.
b. Hot surface ignitor is energized for 15 sec., then off.
c. Blower motor operates for 15 sec.
d. After component test is completed, one or more status
codes (11, 25, 41 or 42) will flash. See component test
section of service label (Fig. 38) in furnace for explan-
ation of status codes.
NOTE : To repeat component test, turn setup switch SW1--6
OFF, then back ON.
4. Turn setup DIP switch SW1--6 OFF. Reconnect R lead to
furnace control board, release blower door switch and re-
install blower access door.
5. Operate furnace per instruction on inner door.
6. Verify furnace shut down by lowering thermostat setting
below room temperature.
7. Verify furnace restarts by raising thermostat setting above
room temperature.
Adjustments
FIRE HAZARD
Failure to follow this warning could result in injury, death
and/or property damage.
DO NOT bottom out gas valve regulator adjusting screw.
This can result in unregulated gas valve outlet pressure and
result in excess overfire and heat exchanger failures.
!
WARNING
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 inlet gas. (See Fig. 40)
CAUTION
!
Furnace gas input rate on rating plate is for installations at
altitudes up to 2,000 ft. (610 M). Furnace input rate must be
/--2 percent of furnace rating plate input.
1. Determine the correct gas input rate. Refer to the unit
rating plate. The input rating for altitudes above 2,000 ft.
(610 M) must be reduced by 2 percent for each 1,000 ft.
(305 M) above sea level. For installations below 2,000 ft.
(610 M), refer to the unit rating plate. For installations
above 2,000 ft. (610 M), multiply the input on the rating
plate by the de--rate multiplier in Table 9 for the correct
input rate.
Table 9 – Altitude Derate Multiplier for U.S.A.
ALTITUDE
(FT. / M)
PERCENT
OF
DERATE
DERATE
MULTIPLIER
FACTOR*
0–2000 (0---610) 0 1.00
2001–3000 (610---914) 4---6 0.95
3001–4000 (914---1219) 6---8 0.93
4001–5000 (1219---1524) 8---10 0.91
5001–5400 (1525---1646) 10---11 0.90
* Derate multiplier factors are based on midpoint altitude for altitude
range.