Nordyne O4LD-140A-16-R, Инструкция по установке, эксплуатации и обслуживанию

Страница: 7 / 24

152B0801
7
17. COMBUSTION CHAMBER
This furnace is equipped with a high quality
cerafelt combustion chamber. It is held in place
by a support bracket and stainless steel retaining
band and clamp.
CHECK THE ALIGNMENT OF
THE COMBUSTION CHAMBER AND OIL
BURNER BEFORE FIRING. IT IS POSSIBLE
FOR THE COMBUSTION CHAMBER TO SHIFT
IF SUBJECTED TO ROUGH HANDLING
DURING TRANSIT
. The combustion chamber
should be inspected for damage or carbon build
up whenever the oil burner is removed for repairs
or routine maintenance.
DO NOT START THE BURNER UNLESS
THE BLOWER ACCESS DOOR IS
SECURED IN PLACE.
18. CIRCULATING AIR BLOWER
Both front breech and rear breech models are
equipped with direct drive blower systems. Direct
drive blower speed adjustments are not normally
required in properly sized extended plenum duct
systems. The motor RPM and air CFM delivery
will vary automatically to accommodate
conditions within the usual range of external
static pressures typical of residential duct
systems. Under-sized duct systems may require
a higher blower speed to obtain a reasonable
system temperature rise. Some older duct
systems were not designed to provide static
pressure. They typically feature special reducing
fittings at each branch run and lack block ends
on the trunk ducts. These systems may require
modification to provide some resistance to the
airflow to prevent over-amping of the direct drive
blower motor. Selecting a lower blower speed
may correct this problem.
Direct drive blower speeds are adjusted by
changing the "hot" wires to the motor winding
connections. Please refer to wiring diagram in
Appendix B or the wiring diagram label affixed to
the furnace.
THE NEUTRAL WIRE (normally
the white wire) IS NEVER MOVED TO ADJUST
THE BLOWER SPEED
.
It is possible and acceptable to use a single
blower speed for both heating and cooling
modes. The simplest method to connect the
wiring from both modes is to use a "piggy-back
connector" accommodating both wires on a
single motor tap. It is also acceptable to connect
the selected motor speed with a pig tail joined to
both heating and cooling speed wires with a wire
nut. As a safety precaution against accidental
disconnection of the wires by vibration, it is
advisable to secure the wire nut and wires with a
few wraps of electricians tape.
DO NOT CONNECT POWER LEADS
BETWEEN MOTOR SPEEDS. THE
NEUTRAL WIRE MUST ALWAYS BE
CONNECTED TO THE MOTOR'S
DESIGNATED NEUTRAL TERMINAL.
DISCONNECT THE POWER SUPPLY TO
THE FURNACE BEFORE OPENING THE
BLOWER ACCESS DOOR TO SERVICE
THE AIR FILTER, FAN AND MOTOR.
FAILURE TO SHUT OFF POWER
COULD ALLOW THE BLOWER TO
START UNEXPECTEDLY, CREATING A
RISK OF DEATH OR PERSONAL
INJURY.
If the joining of the blower speed wiring is done
in the furnace junction box, tape off both ends of
the unused wire.
Do not use the blower speed wires as a
source of power to accessories.
The unused
motor taps auto-generate sufficiently high
voltages to damage accessory equipment.