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READ THIS FIRST! 

Failure to adhere to the guidelines below can result in severe personal injury, death or substantial property damage.

 

Service and maintenance – 

1.

  To avoid electric shock, disconnect electrical supply before 

performing maintenance. 

2.

  To avoid severe burns, allow furnace to cool before 

performing maintenance. 

3.

  Perform service and maintenance as described in this 

manual and the burner manual. 

4.

  Do not attempt to make adjustments to the blower or motor 

while the furnace is in operation. Disconnect power to the 
furnace and be sure all parts have stopped moving before 
attempting adjustments or maintenance. 

5.

  The burner must be set up and adjusted using combustion 

test instruments. Visual examination of the flame alone 
cannot determine combustion performance. 

Operation - 

6.

 

Do not use the furnace as a construction heater. 

7.

  Do not operate any furnace if the heat exchanger is 

damaged, corroded or pitted. Toxic flue products could enter 
the air stream. 

8.

  Do not jumper, attempt to by-pass or override any limit 

control. 

9.

  Do not block flow of combustion or ventilation air to furnace. 

Do not block or obstruct the air openings in the furnace 
casing. 

10.

  Do not store or use combustible materials, gasoline, or other 

flammable liquids or vapors in the furnace area. 

11.

  Do not operate the furnace if the furnace area will be 

exposed to air contaminants as described on page 6. 

12.

  Should overheating occur, do not turn off or disconnect 

electrical supply to furnace. Instead, shut off the oil supply at 
a location external to the appliance, if possible. 

13.

  Do not use this furnace if any part of it has been under 

water. Call a qualified service technician immediately, to 
inspect the furnace and to replace any part of the furnace, 
control system or burner that was submerged in water. 

14.

  Do not operate furnace if temperature rise through heat 

exchanger exceeds 85°F. 

15.

  Inspect, clean and replace (if necessary) return air filter 

regularly. 

16.

  Do not obstruct return air grills or supply air outlets. 

17.

  Supply only with #2 fuel oil to the burner. Never attempt to 

use gasoline, a mixture of gasoline and oil, waste fuel, 
reused or any other substance in the burner of furnace. 

Installation - 

18.

  Do not block flow of combustion or ventilation air to furnace. 

Do not block or obstruct the air openings in the furnace 
casing. 

19.

  Connect furnace only to a functional vent system in good 

condition. Place the furnace to allow proper venting, with the 
shortest possible venting and minimum number or elbows. 

20.

  Always connect and seal a return air duct to the furnace 

unless the furnace is located in a large space, such as an 
unpartitioned basement. Route the return air duct to an 
adjacent room if no return air manifold is used. 

21.

  Install furnace maintaining minimum clearances for service 

and separation from combustible surfaces described in this 
manual.  

22.

  Install, start-up, service and maintain burner per instructions 

in this manual and the burner manual. 

23.

  Verify burner is properly inserted through the combustion 

chamber opening. 

24.

  Furnace must be installed so that burner and control system 

components are protected from dripping, spraying water or 
rain during operation or service. 

25.

  If installing an air conditioning evaporator coil, install the coil 

downstream of, or in parallel with, the furnace to prevent 
condensation on the furnace heat exchanger. If the coil is in 
parallel, provide means to prevent flow of chilled air into the 
furnace, including an interlock to prevent simultaneous 
operation of heating and air conditioning. 

 

Apply the following suggestions to prevent unsatisfactory operation of the furnace. 

Installation – 

1.

 

Be sure to level the furnace, using a spirit level on the front and 
one side. If the furnace is not level, oil can drip into the 
combustion chamber after burner cycling and contaminate the 
heat exchanger and the burner head. 

2.

  Make sure all legs are in contact with the floor to distribute the 

load and prevent the possibility of undue noise or vibration. 

Avoid locating return grills in rooms that may contain undesirable 
odors. 

3.

  Never locate a return air grill closer than approximately 20 feet 

from the furnace. 

4.

  Locate the furnace near the center of the supply and return duct 

systems. 

5.

  Always check the size of the ducts on a replacement installation, 

particularly if adding air conditioning. 

It is recommended that carbon monoxide detectors be installed wherever oil or gas fired heaters are used. Carbon monoxide 
can cause bodily harm or death. For this reason, agency approved carbon monoxide detectors should be installed in your 
residence and properly maintained to warn of dangerously high carbon monoxide levels 
There are several sources of possible smoke and flames in a residence. Smoke and flames can cause bodily harm or death. For 
this reason, agency approved smoke detectors should be installed in your residence and properly maintained, to warn early on, 
of a potentially dangerous fire. Also, the house should be equipped with approved and properly maintained fire extinguishers. 
Your unit is equipped with safety devices that can prevent it from functioning when anomalies are detected such as the optional 
Blocked Vent Shut-off device. 

Summary of Contents for PLB-112 LOW-BOY

Page 1: ...y could result in severe personal injury death or substantial property damage When calling or writing about the furnace Please indicate furnace model number and serial number from rating label You may...

Page 2: ...bows 20 Always connect and seal a return air duct to the furnace unless the furnace is located in a large space such as an unpartitioned basement Route the return air duct to an adjacent room if no re...

Page 3: ...to a hazardous electrical condition and to premature failure of the equipment The minimum clearances from combustible material for each of the positions are specified in Table 1 If the furnace is ins...

Page 4: ...r to the burner manufacturer s instructions Also the burner must be installed always in the same way independently of the furnace orientation 1 Position the mounting gasket between the mounting flange...

Page 5: ...where the draft is either high or variable due to external conditions Follow the instructions provided with the regulator 1 5 4 Side wall Venting The heating unit is approved for side wall venting Th...

Page 6: ...xposure to the following substances a Permanent wave chemicals for hair b Chlorinated waxes and cleaners c Chlorine based swimming pool chemicals d Water softening chemicals e De icing salts or chemic...

Page 7: ...nstalled with a 4 tons air conditioning evaporator coil Heating mode airflow is still 1050 CFM Cooling mode air flow use Equation 3 4 CFM 4 x 400 1600 CFM The larger number is 1600 CFM cooling so the...

Page 8: ...7 6 6 900 14 58 41 31 25 21 19 17 14 12 11 10 9 8 8 7 7 7 1000 16 64 45 34 28 23 20 18 15 13 11 10 9 9 8 8 7 7 1100 16 72 49 38 30 25 22 19 16 14 12 11 10 9 9 8 8 7 1200 16 54 41 33 27 24 21 17 15 13...

Page 9: ...600 12 59 38 28 22 19 16 15 13 700 12 69 44 32 25 21 18 16 15 13 800 14 50 36 29 24 20 18 16 14 900 14 56 41 32 26 22 20 18 15 1000 16 63 45 35 29 24 22 19 17 15 1100 16 69 49 38 31 26 23 21 18 16 120...

Page 10: ...same the RED wire must be moved to UNUSED LEADS on the electronic board and the jumper provided with the BLUE wire must be used between the HEAT and COOL terminals The blower start stop delays can be...

Page 11: ...he blower rail locking screws are well tightened 3 The Blocked Vent Shut Off BVSO is installed according to instructions for chimney venting 4 The oil supply valve is open 5 The burner Reset button is...

Page 12: ...himney installation and 0 05 to 0 17 W C for direct vent installation A high pressure condition may be caused by excessive combustion air due to the air band being too wide open or a lack of flue draf...

Page 13: ...heat exchanger and combustion chamber should be inspected to determine if replacement is required 8 After the cleaning replace the heat exchanger baffles flue collar plate and oil burner 9 Readjust t...

Page 14: ...rough furnace checked not to exceed 85 F and the blower speed adjusted if necessary 19 Was the thermostat heat anticipator set per wiring diagram 20 Was the burner started and tested per burner manual...

Page 15: ...__________ Serial number __________________________________ Date installed ___________________________ Installation instructions have been followed Checkout sequence has been performed Above informati...

Page 16: ...zing Maximum fuse size amps Ship weight pounds PLB 112 DD 55 75 1 x 20 x 20 or 2 x 16 x 20 115 60 1 12 6 15 2 20 195 PLB 112 VS 60 72 1 x 20 x 20 or 2 x 16 x 20 115 60 1 12 2 14 7 15 195 0 25 w c 0 50...

Page 17: ...112 VS Model Input BTU h Firing rate USGPH AFUE Nozzle Delavan Pump pressure PSIG Burner tube insertion length Inch Combustion air adjustment Turbulator Damper 95 200 0 68 86 6 0 60 70A 130 1 2 6 112...

Page 18: ...C 1 OFF 2 ON 3 0 1200 1320 1080 D 1 ON 2 ON 2 5 1000 1100 900 SW4 DELAY DIP switch position HEAT INPUT USGPH PreRun On Delay CFM Level Time ShortRun On Delay CFM Level Time Off Delay CFM Level Time A...

Page 19: ...PLB 112 Oil Furnaces Furnace Manual 11 13 19 5 DIMENSIONS AND RATINGS continued Figure 9 Wiring Diagram 4 Speed Motor PSC...

Page 20: ...PLB 112 Oil Furnaces Furnace Manual 20 11 13 5 DIMENSIONS AND RATINGS continued Figure 10 Wiring Diagram Variable Speed Motor ECM...

Page 21: ...PLB 112 Oil Furnaces Furnace Manual 11 13 21 6 COMPONENT AND REPLACEMENT PARTS Figure 11 Parts List With 4 Speed motor PSC B50128A...

Page 22: ...TER RACK 26 B03553 01 ELECTRICAL BOX SPACER 27 B03549 01 ELECTRICAL BOX 28 R02R003 HIGH LIMIT L195 30F 1 75 in 29 B03550 01 ELECTRICAL BOX COVER Panel only 30 F06F015 ZINC WASHER 1 7 16 31 Z99F061 SIG...

Page 23: ...PLB 112 Oil Furnaces Furnace Manual 11 13 23 6 COMPONENT AND REPLACEMENT PARTS continued Figure 12 Parts List With variable speed motor ECM B50129A...

Page 24: ...ION 25 B03711 01 RIGHT ANGLE FILTER RACK 26 B03553 01 ELECTRICAL BOX SPACER 27 B03534 01 ELECTRICAL BOX 28 R02R003 HIGH LIMIT L195 30F 1 75 in 29 B03550 01 ELECTRICAL BOX COVER Panel only 30 F06F015 Z...

Page 25: ...f the furnace oil burner should shut down on flame failure the burner primary control will lock out Ask your service technician to show you the correct procedure to reset the primary control button NE...

Page 26: ...PLB 112 Oil Furnaces Furnace Manual 26 X40207 Rev B 11 13...

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