Carrier 120 Series Installation, Start-Up, And Operating Instructions Manual page 10

5_
6_
--> ?.
c. _se of an oversized nozzle input
& Pump pressure over values listed iu Table 10.
The CO 2 and stack temperature instruments enable you to
obtain data required to determine thermal efficiency of _;ar=
*lace
An oil filter should be installed as close to burner as possible
with ALL oil burners and is essential on lower firing rate
bumers_ We recommend the use of a tow pressure drop oil
filter such as the General Filter, Inc. model #lA-25A or
equivalenL
The oil pressure regulator is factory set to give oil pressure of
130 psi J:br the model having 105,000 BTUH input and 130 psi
fbr d'*e model having 119,000 BTUH input. The firing rate
noted on nameplate may be obtained using the nozzles and
pump pressures indicated in Tahle 10.
--> TaMe 10--Sumer Input and Nozzle Size and Pump
Pressure
FURNACE
INPUT REAL PUMP
INPUT NOZZLE
USGPN PRESSURE
(BTUH)
70,000 0.50 0.50-70VV 100
91,000 0.65 0.55-70B 140
105,000 0.75 0.65-70B 133
120,000 0.85 0.75-70B 128
140,000 1.00 0.85-70B 138
15&000 1.10 0.85-70B 167
SPECIFBCAT_ON
PUMP PRESSURE
100
140
130
130
140
170
8. On a new iustallation, air entrapped in oil lille leading fiom
tank to nozzle must be thoroughly purged in order to prevent
excessive after &ip. The oil pump is provided with a special
fitting which allows purging of ally air between tank and oil
pump. Tile proper procedt/re for performing this operation is
as £dlows:
a. Place a piece of clear plastic 1/4 in. diameter robing over
purge fitdng on oil pump.
b. Start oil burner, then open purge fitting and allow burner to
run until purge robe is completely fi'ee of air bubbles.
c. Tighten purge fitting. Allow oil to run to nozzle and fire
burner.
d. If purging takes longer than 15 sec and no flame has been
established, burner stops. Push reset button on fi'out of
primary control to restart burner
e. For detailed information on operation of prima_ contloL
refer to instructions included with iq/rnace.
After all the setup procedures mentioned above have been corn=
pleted, the burner should be allowed to operate and an inspection
rein'or should be used to observe the flame pattern at tip of nozzle.
Any irregularities such as burning to 1 side or pulsating flame
patterns should be connected by changing nozzle.
Step 3--Fan Adjustment Check
_his f_lruace is equipped with a 4=speed direct-drive motor to
deliver a temperature rise within range specified on rating plate,
between remm and supply plenums, at external duct static pressure
noted on rating plate
When operating furnace in heating mode, static pressure and
temperature rise (supply=air temperatme minus return=air
temperature) nlust be within those limits specified on rating
label. Failure to follow this warning could lead to severe
ftm]ace damage.
Adjust fan speed A(COPdDING TO OIL INPUT SELE(TED so
that temperature rise is within rise range specified on rating plate.
(See Table 110 Consult wiring diagram for speed changes on
direct=&ive motor
Tab{e 11--Speed Selection
FURNACE RECOMMENDED
UNiT
iNPUT BLOWER
SIZE
(BTUH) SPEED
70,000/119,000 Med-Low
105-t2/
120_20 91,000/140,000 Med-High
105,000/154,000 High
To adjust fire off time, set DIP switches ou coutloi board to obtaiu
desired timing. (See Fig. 5.)
60 Sec 90 Sec 120 Sec 150 Sec
DELAY OFF DIP SWITCH SETTINGS
A95115
Fig. 5--Fan Off Time DIP Switch Settings
(Slack Box Represents Switch Posit{on)
Step 4--Limit Controm Check
After furnace has beer* iu operation _br at least 15 minutes, restrict
return-air supply by blocking filters or closing return registers and
allow furnace to shut down or* high limit. The burner should shut
off. and main blower should contkme to rnn.
Remove restriction, and burner should come back on in a f_w
minutes.
Step 5--For Year-Round Air Conditioning
This fitmace is designed £_r use in cor_juncfion with cooling
equipment to provide year-round air couditioniug_ The blower has
been sized fbr both heating and cooling, however, fan motor speed
may need to be changed to obtain necessary cooling airflow
Step 6--Heating
The blower speed is _i_ctory set to deliver required airflow at
normal duct static pressure.
Step 7--Cooling
The blower speed may be field adjusted to deliver required airflow
for cooliug application. (See Table 12)
10
Step 8--Constant Blower Switch
This _hruace is equipped with a coustant low=speed blower option.
Whenever room themlostat is not calling for heating or cooling,
blower runs on tow speed in order to provide air circulation_ If
constant blower option is not desired, the rocker switch on top of
cabinet may be used to mm off constant speed.