background image

Page 15

Unit Start−Up & Adjustments 

Before starting the unit, make sure the oil tank is adequate-
ly filled with clean No. 1 or No. 2 furnace oil.

NOTE − Water rust or other containments in oil supply sys-
tem will cause malfunction and failure of the internal parts
of the fuel unit.

CAUTION

Never burn garbage or paper in the heating system.
Never leave papers near or around the unit.

Blower door must be in place before start-up.

1. Set thermostat for heating demand and turn on electri-

cal supply to unit.

2. Check initial air adjustment. All units are equipped with

an air adjustment dial on the right side of the burner.
See burner parts arrangement illustration.

3. Turn unit on. Place a can or container under the bleed

port located on the fuel pump. Loosen nut on bleed
port to release air and oil mixture from fuel line. Allow
mixture to escape until a steady stream of oil is emitted
from the port. Drain at least 1/2 pint of oil from the
pump. Retighten nut on bleed port. If lockout occurs,
press reset button and continue with bleed procedure.

NOTE − A two−line fuel system will normally bleed itself
by forcing air back to the tank through the return line.
This type of bleeding procedure is not necessary.

4. If burner fails to start, push reset button on primary

safety control and the burner motor reset button once.
See part arrangement illustration.

CAUTION

Do not push the reset button on the primary control
more than one time.

5. If burner fails to light again, refer to the troubleshooting

section in this manual (beginning on Page 18).

Fuel Pump Pressure

Measure fuel pump pressure with unit off. Attach pressure
gauge to pump outlet. Turn unit on and check pressure and
compare to table 7. Adjust if necessary.

Temperature Rise

To measure temperature rise, place plenum thermometers
in warm air and return air plenums. Locate thermometer in
warm air plenum where thermometer will not see" the heat
exchanger to prevent it from picking up radiant heat. Set
thermostat to its highest setting to start unit. After plenum
thermometers have reached their highest and steadiest
readings, subtract the readings. The difference in temper-
atures in the supply and return air plenums should approxi-
mate the temperature rise range listed in table 7 and the
appliance rating plate. If not, adjust the blower motor pulley
to adjust the blower speed.

Limit Control

Limit Control  Do not adjust from factory setting.

Fan Control

The fan on time of 30 seconds is not adjustable. Fan off
time (time that the blower operates after the heat demand
has been satisfied) can be adjusted by moving the delay
switches on the fan control board. Fan off time will affect
comfort and is adjustable to satisfy individual applications.
See figure 20.Set the heat fan off delay switches to either
60, 90, 120, or 150 seconds. The factory setting is 90 sec-
onds.

Figure 20

Delay Off Switch Settings

60 sec

90 sec

120 sec

150 sec

Table 7

OHR23 Operating Parameters

Unit
Type

Fuel Nozzle Size,
Spray Angle, &
Pattern

Input 
Rating
Btu/Hr

Output
Rating
Btu/Hr

Head
Type

Temp. rise
+10° F hrz/
down

−105/
−120

.65 GPH -.80°, B
for −105 input
*.75 GPH -.80°, B
for −120 input

105,000
119,000

85,000
97,000

FB3

70/70

−140/
−154

.85 GPH - .80°, B
for −140 input
*1.0 GPH -.80°, B
for −154 input

140,000
154,000

113,000
125,000

FB6

60/70

*Nozzle must be field provided for field conversion to high-
er heating input. Oil burner pump pressure is 140 psi for
each unit.

Burner Adjustment

The following steps are essential to the proper operation of
OHR23 series oil furnaces. To prevent sooting, follow
these instructions in the sequence given.

1. Perform Draft Test

Perform a draft test at the breach between the outlet of
the vent connector and the barometric draft control.
Drill a 1/4" access hole to allow the draft gauge to be
inserted into the vent connector.
A minimum draft of 0.03 inches w.c. must be estab-
lished without the burner in operation. With the burner
in operation, the draft should be 0.04 to 0.05 inches
w.c. This is VERY critical to the flame retention head
burners.

Oil furnace installations also require careful inspection
to make sure the chimney is in good shape and can ac-
commodate the products of combustion. The temper-
ature in the unconditioned space will also affect the
draft if long vent connectors are allowed to get too
cold.

Содержание OHR23-105

Страница 1: ...nes Sizing 12 Oil Supply Line Filter Connections 13 Leak Check 13 Electrical Wiring 14 Unit Start Up Adjustments 15 Service 16 Start Up Performance Checklist 17 Troubleshooting 18 RETAIN THESE INSTRUC...

Страница 2: ...VIEW SIDE VIEW FRONT VIEW FLUE OUTLET 8 203 SUPPLY AIR OPENING HORIZONTAL POSITION DOWNFLOW POSITION OPTIONAL DOWNFLOW COMBUSTIBLE FLOOR BASE OPTIONAL DOWNFLOW ADDITIVE BASE Additive Base Raises Furn...

Страница 3: ...RETAINING 1 4 HEX HEAD SCREW FB HEADS ASSY FOR AIR TUBE ASSY ELECTRODE HEAD NOZZLE LINE PEDESTAL ADAPTER NOZZLE AIR SCOOP INLET WHEEL BLOWER FLANGE GASKET MOTOR 4X4 BOX IGNITOR DOOR GASKET REAR ACCESS...

Страница 4: ...combustible materi al as listed unit rating plate and in tables 2 or 3 Unit service and accessibility clearances take precedence over fire protection clearances Table 2 Horizontal Installation Clearan...

Страница 5: ...tible materi al A minimum clearance of 1 must be maintained be tween bottom of furnace and combustible material Suspended Installation To suspend furnace remove knockouts in top of panel at warm air d...

Страница 6: ...ometer Oil vacuum gauge Beckett T 500 gauge Knowledge of proper test equipment operation CAUTION Improper nozzle and or air adjustment of this unit may result in sooting problems Refer to the follow i...

Страница 7: ...he chimney to determine whether repairs are necessary Make sure the chimney is properly constructed and sized according to the requirements of the National Fire Protec tion Association The smallest di...

Страница 8: ...ey BAROMETRIC CONTROL IN EITHER LOCATION DRAIN FOR CONDENSATE FACTORY BUILT CHIMNEY Figure 9 BAROMETRIC CONTROL MAY BE INSTALLED IN EITHER VERTICAL OR HORI ZONTAL SECTION OF FLUE PIPE WITHIN 18 OF FLU...

Страница 9: ...ted on a plat form in a confined space such as a closet or small equipment room Small leaks around the base of the unit at the platform or at the return air duct connection can cause a potentially dan...

Страница 10: ...AIR Figure 13 NOTE EACH AIR DUCT OPENING SHALL HAVE A FREE AREA OF AT LEAST ONE SQUARE INCH 6 4 SQUARE CENTIMETERS PER 2 000 BTU 586 W PER HOUR OF THE TOTAL INPUT RATING OF ALL EQUIPMENT IN THE ENCLOS...

Страница 11: ...efer to the manufacturers installation instruc tions for proper installation procedures and service parts information Do not use the same vent with any other appliance when using a sidewall vent syste...

Страница 12: ...d a vacuum of 6 152 mm Hg or less a single stage fuel pump with a supply line and no return line should be adequate See figure 16 Manual bleeding of the fuel pump is required on initial start up Failu...

Страница 13: ...erly 5 Tighten the bleed valve securely Two Pipe Systems If the installation requires a two pipe operation install the bypass plug included in the bag which is attached to the pump To convert the pump...

Страница 14: ...r on thermostat ac cording to the wiring diagram sticker provided on unit 3 Install a separate fused disconnect switch near unit so power can be shut off for servicing 4 Complete line voltage wiring f...

Страница 15: ...reached their highest and steadiest readings subtract the readings The difference in temper atures in the supply and return air plenums should approxi mate the temperature rise range listed in table 7...

Страница 16: ...ice Servicing Filter NOTE Under no circumstances should the access panels to the blower compartment be left off or left partially open 1 Throw Away Type Filters Filters should be checked monthly and r...

Страница 17: ...Burner Model No Serial Number Piping Connections Tight All Valves Open Blower Motor Lubrication OK Oil Pump Pressure recommended minimum 140 psi PROPER DRAFT Draft Reading recommended 03 to 04 inches...

Страница 18: ...rner motor is de energized If heat fan has started it continues through the selected delay off period Established flame fails Burner motor is de energized and oil primary control goes into recycle mod...

Страница 19: ...auxiliary limit Power Check furnace disconnect switch main disconnect Open switch Close switch switch main disconnect Blown fuse or tripped circuit breaker Replace fuse or reset circuit breaker Therm...

Страница 20: ...e closed Open valve Oil Filters Oil Line Listen for pump whine Oil line filter is plugged Replace filter cartridges Oil Line Kinks or restriction in oil line Repair or replace oil line Plugged fuel pu...

Страница 21: ...Cracked or burned lead insulators Replace electrode leads Ignition Transformer Connect ignition leads to the transformer Start burner and observe spark Check line voltage to transformer primary Low li...

Страница 22: ...Safety Source Procedure Check Causes Correction Poor Fire If burner continues to r n does not Unbalanced fire Replace nozzle to run does not lock out of safety fault may be due to Too much air lean s...

Страница 23: ...filters Clean or replace filter between line voltage connections to Burner running too slow Increase blower speed to maintain proper temp rise connections to primary control bl k hit Blower motor seiz...

Страница 24: ...aks into heat exchanger around inspection door etc Correct cause of air leak CO2 if less than 10 Excessive draft Adjust barometric draft control for correct draft Incorrect burner head adjustment Corr...

Отзывы: