Dettson LOWBOY OLR154A16A Assembly instructions

LOWBOY
OIL-FIRED FURNACE
MODELS:
OLR154A16A
OLV154A16A
INSTALLER / SERVICE TECHNICIAN:
Attention:
Do not tamper with the unit or its controls.
Call a qualified service technician.
USE THE INFORMATION IN THIS MANUAL FOR THE IN-
STALLATION AND SERVICING OF THE FURNACE AND
KEEP THE DOCUMENT NEAR THE UNIT FOR FUTURE
REFERENCE.
HOMEOWNER: Manufactured by: Dettson Industries Inc.
PLEASE KEEP THIS MANUAL NEAR THE FURNACE FOR
FUTURE REFERENCE. Sherbrooke, Qc, Canada
www.dettson.com
Printed in Canada on 100% recycled paper 2019-04-12 X40171 Rev.I

Table of content
1 SAFETY 4
1.1 SAFETYLABELINGANDWARNINGSIGNS............................................. 4
1.2 IMPORTANTINFORMATION ........................................................ 4
1.3 DETECTIONSYSTEMS ............................................................ 4
1.4 DANGEROFFREEZING ........................................................... 5
2 INSTALLATION 5
2.1 POSITIONINGTHEFURNACE....................................................... 5
2.1.1 Installationinanenclosure ........................................ 5
2.2 ELECTRICALSYSTEM............................................................. 6
2.3 INSTALLATIONOFTHETHERMOSTAT ................................................ 6
2.4 INSTALLATIONOFTHEBURNER..................................................... 7
2.4.1 Nozzles................................................... 7
2.4.2 AirandTurbulatorSettings ........................................ 7
2.4.3 Postpurgedelayadjustment ....................................... 7
2.5 VENTING....................................................................... 7
2.5.1 Masonrychimney ............................................. 7
2.5.2 Factory-builtchimneys........................................... 8
2.5.3 Draftregulator ............................................... 8
2.5.4 Sidewallventing.............................................. 8
2.6 BLOCKED VENT SHUT-OFF DEVICE (BVSO) FOR CHIMNEY VENTING . . . . . . . . . . . . . . . . . . . . . . . . 8
2.6.1 BVSOFunctionalTest........................................... 8
2.7 COMBUSTIONAIRSUPPLYANDVENTILATION.......................................... 8
2.7.1 ContaminatedCombustionAir ...................................... 9
2.7.2 Burner with Outdoor Combustion Air Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.8 OILTANK....................................................................... 9
2.9 DUCTING....................................................................... 9
2.9.1 Airfilter ................................................... 9
2.10 SUPPLY AIR ADJUSTMENTS (4 SPEED MOTORS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.11 SUPPLY AIR ADJUSTMENTS (ECM VARIABLE SPEED MOTORS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.12INSTALLATIONOFACCESSORIES.................................................... 12
2.12.1Humidifier(HUM).............................................. 12
2.12.2ElectronicAirCleaner(EAC) ....................................... 12
2.12.3AirConditioner(orHeatPump)...................................... 13
2.12.4 Emergency Heating Mode - variable speed Motor (ECM) . . . . . . . . . . . . . . . . . . . . . . . 13
3 OPERATION 13
1

3.1 START-UP....................................................................... 13
3.2 OPERATINGSEQUENCEOILHEATINGMODE .......................................... 13
3.3 CHECKSANDADJUSTMENTS....................................................... 14
3.3.1 Purgingtheoilline............................................. 14
3.3.2 Pressureadjustment............................................ 14
3.3.3 CombustionCheck............................................. 14
3.3.4 DraftRegulatoradjustment ........................................ 14
3.3.5 Overfirepressuretest ........................................... 14
3.3.6 VentTemperatureTest .......................................... 14
3.3.7 Supply Air Temperature Rise Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3.8 Limitcontrolcheck............................................. 15
3.3.9 RestartafterBurnerFailure........................................ 15
4 MAINTENANCE 15
4.1 CLEANINGTHEHEATEXCHANGER .................................................. 15
4.2 CLEANING THE BLOCKED VENT SHUT-OFF DEVICE (BVSO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3 CLEANINGTHEBURNERHEAD ..................................................... 16
4.4 REPLACINGTHENOZZLE ......................................................... 16
4.5 REPLACINGTHEOILFILTER ....................................................... 16
4.6 CHANGINGTHEAIRFILTER ........................................................ 16
5 FURNACE INFORMATION 17
6 TECHNICAL SPECIFICATIONS 18
List of figures
Figure 1: Location and dimensions of ventilation air openings in a closet door . . . . . . . . . . . . . . . . . 6
Figure 2: Heating & Air Conditioning with 4-speed motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3: Thermostat wiring, heating and air conditioning with ECM variable speed motor . . . . . . . . . . 6
Figure 4: Thermostat wiring, heating and air conditioning/heat pump with ECM variable speed motor . . . . 7
Figure 5: Blower “OFF” delay - Board #ST9103A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6: Blower Start/Stop Delays - Board#1158 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure7: FurnaceDimensions............................................ 21
Figure 8: Wiring diagram 4-speed motor (PSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 9: Wiring diagram variable speed motor (ECM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 10: Parts list with 4-speed motor (PSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 11: Parts list with variable speed motor (ECM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2

List of tables
Table 1: Blower speed adjustments, heating mode, 4-speed motor . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2: Blower speed adjustments, 4-speed motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 3: Airflow adjustments - Heating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 4: Airflow adjustments - Air conditioning mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table5: Airflowadjustments-Allmodes...................................... 12
Table 6: Delay adjustments - Heating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table7: Technicalspecifications .......................................... 18
Table 8: Airflow data, models with 1.0 HP ECM motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 9: Airflow data model with 1.0 HP 4-speed motor (PSC) . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 10: Minimum clearances from combustible materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 11: Parts list with 4-speed motor PSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 12: Parts list with variable speed motor (ECM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3

1 SAFETY
1.1 SAFETY LABELING AND
WARNING SIGNS
The words DANGER, WARNING and CAUTION are
used to identify the levels of seriousness of certain haz-
ards. It is important that you understand their meaning.
You will notice these words in the manual as follows:
DANGER
Immediate hazards which WILL result in death or
serious bodily and/or material damage.
WARNING
Hazards or unsafe practices which CAN result in
death or serious bodily and /or material damage.
CAUTION
Hazards or unsafe practices which CAN result in mi-
nor bodily and /or material damage.
1.2 IMPORTANT INFORMATION
WARNING
Non-observance of the safety regulations out-
lined in this manual will potentially lead to conse-
quences resulting in death, serious bodily injury
and/or property damage.
WARNING
Installation and repairs performed by unqualified
persons can result in hazards to them and to oth-
ers. Installations must conform to local codes or,
in the absence of such codes, to codes of the
country having jurisdiction.
The information contained in this manual is in-
tended for use by a qualified technician, familiar
with safety procedures and who is equipped with
the proper tools and test instruments.
Failure to carefully read and follow all instructions
in this manual can result in death, bodily injury
and/or property damage.
a) It is the homeowner’s responsibility to engage a
qualified technician for the installation and subse-
quent servicing of this furnace;
b) Do not use this furnace if any part of it was under
water. Call a qualified service technician immedi-
ately to assess the damage and to replace all criti-
cal parts that were in contact with water;
c) Do not store gasoline or any other flammable sub-
stances, such as paper or carton, near the furnace;
d) Do not stack items or boxing within the required
clearances to combustible materials specified in Ta-
ble 10;
e) This furnace is designed for use with #1 or #2 heat-
ing oil only. The use of gasoline, motor oil or any
other oil containing gasoline is prohibited;
f) Never block or otherwise obstruct the filter and/or
return air openings;
g) Ask the technician installing your furnace to show
and explain to you the following items:
i. The main disconnect switch or circuit breaker;
ii. The shutt off valve on the oil tank
iii. The oil filter and how to change it (it must be
changed once a year);
iv. The air filter and how to change it (check
monthly and clean or replace if necessary);
h) Before calling for service, be sure to have the in-
formation of section 5 of your manual close by in
order to be able to provide the contractor with the
required information, such as the model and serial
numbers of the furnace.
1.3 DETECTION SYSTEMS
It is recommended that carbon monoxide detectors be
installed wherever oil or gas fired heaters are used. Car-
bon monoxide can cause bodily harm or death. For this
reason, agency approved carbon monoxide detectors
should be installed in your residence and properly main-
tained 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 de-
tectors 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
a blocked venting system.
4

1.4 DANGER OF FREEZING
CAUTION
If your furnace is shut down during the cold weather
season, water pipes may freeze, burst and cause se-
rious water damage. Turn off the water supply and
bleed the pipes.
If the heater is left unattended during the cold weather
season, take the following precautions:
a) Close the main water valve in the house and purge
the pipes if possible. Open all the faucets in the
house;
b) Ask someone to frequently check the house during
the cold weather season to make sure that there is
sufficient heat to prevent the pipes from freezing.
Tell this person to call an emergency number if re-
quired.
2 INSTALLATION
The unit is shipped with a burner and its controls. It re-
quires a 115VAC power supply to the control panel and
thermostat hook-up as shown on the wiring diagram, one
or more oil line connections, suitable ductwork and con-
nection to a properly sized vent.
All local and national code requirements governing the
installation of oil burning equipment, wiring and the flue
connection MUST be followed. Some of the codes that
may apply are:
CSA B139: Installation code for oil burning equip-
ment;
ANSI/NFPA 31: Installation of oil burning equipment;
ANSI/NFPA 90B: Warm air heating and air conditioning
systems;
ANSI/NFPA 211: Chimneys, Fireplaces, Vents and
solid fuel burning appliances;
ANSI/NFPA 70: National Electrical Code;
CSA C22.1 : Canadian Electrical Code;
or CSA C22.10
Only the latest issues of these codes shall be used.
2.1 POSITIONING THE FURNACE
WARNING
FIRE AND EXPLOSION HAZARD
The furnace must be installed in a level position,
never where it will slope toward the front.
Do not store or use gasoline or any other
flammable substances near the furnace.
Non-observance of these instructions will poten-
tially result in death, bodily injury and/or property
damage.
CAUTION
This furnace is not watertight and is not designed for
outdoor installation. It must be installed in such a man-
ner as to protect its electrical components from water.
Outdoor installation will lead 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 10.
If the furnace is installed in a basement or on a dirt floor,
in a crawl space for example, it is recommended to install
the unit on a cement base 2.5 cm to 5.0 cm (1" to 2")
thick.
The unit must be installed in an area where the ambient
and return air temperatures are above 15°C (60°F). In
addition, the furnace should be installed as closely as
possible to the vent, so that the connections are direct
and kept to a minimum. The heater should also be lo-
cated close to the centre of the air distribution system.
2.1.1 Installation in an enclosure
The unit can be installed in an enclosure such as a closet.
However, two ventilation openings are required for com-
bustion air. The openings should be located in front of the
furnace approximately 15 cm (6") above the floor and 15
cm (6") below the ceiling. Figure 1 indicates the minimum
dimensions required and the location of the openings.
5

Figure 1 – Location and dimensions of ventilation air
openings in a closet door
2.2 ELECTRICAL SYSTEM
CAUTION
The exterior of the unit must have an uninterrupted
ground to minimize the risk of bodily harm, if ever an
electrical problem develops. A green ground screw is
supplied with the control box for that purpose.
The appliance must be installed in accordance with the
current ANSI/NFPA 70 National Electrical Code, CSA
C22.1 Canadian Electrical Code Part 1 and/or local
codes.
The control system depends on the correct polarity of the
power supply. Connect “HOT” wire (H) and “NEUTRAL”
wire (N) as shown in figures 8 and 9.
A separate line voltage supply should be used, with fused
disconnect switch or circuit breaker, between the main
power panel and the unit.
Only copper wire may be used for the 115V circuit on this
unit. If wires need to be changed, the replacements must
have the same temperature resistance as the originals.
2.3 INSTALLATION OF THE
THERMOSTAT
A thermostat must be installed to control the temperature
of the area to be heated. Follow the instructions supplied
with the thermostat. Also refer to the wiring diagrams
provided with the heating/air conditioning unit. The con-
nections must be made as indicated on the following dia-
grams and the wiring diagrams, Figure 8 and Figure 9.
Figure 2 – Heating & Air Conditioning with 4-speed
motor
Figure 3 – Thermostat wiring, heating and air condi-
tioning with ECM variable speed motor
6

Figure 4 – Thermostat wiring, heating and air condi-
tioning/heat pump with ECM variable speed motor
Note: On units with 2-stage cooling or heat pump,
terminal Y1 must be used. When Y1 on the electronic
control receives a 24 VAC signal, the airflow is re-
duced by 20%. Do not use termninal Y1 with a single
stage cooling or heat pump.
2.4 INSTALLATION OF THE
BURNER
Refer to the burner manufacturer’s instructions. Also, the
burner must be installed always in the same way inde-
pendently of the furnace orientation.
1. Position the mounting gasket between the mount-
ing flange and the burner mounting plate. Align the
holes in the burner mounting plate with the studs
on the mounting flange and bolt securely in place.
2. Remove the burner drawer assembly or the air tube
assembly;
3. Install the nozzle (refer to Technical Specifications
in Table 7);
4. Check the electrode settings;
5. Make the electrical connections;
6. Complete oil line connections.
2.4.1 Nozzles
The burner comes equipped with an appropriate noz-
zle. However, if another size or a replacement nozzle
is required, use the manufacturer’s recommended spray
angle and type as shown in Table 7 and based on a pump
pressure of 100 psi.
Always select nozzle sizes by working back from the de-
sired flow rate at operating pressure and not the nozzle
marking.
2.4.2 Air and Turbulator Settings
Before starting the burner for the first time, adjust the
air and turbulator settings to those listed in this manual
(Table 7). Once the burner becomes operational, final
adjustments will be required. Refer to the section 3 of
this manual.
2.4.3 Post purge delay adjustment
The post purge delay on the oil-fired burners is factory
set to zero second. This delay is applicable for all instal-
lations with chimney venting. For heating units installed
with side wall venting and a burner equipped with this fea-
ture, the post purge delay must be set to 15 seconds. No
delay is required for Riello burners. Refer to the burner
control instruction manual and markings for proper ad-
justment of the post purge delay.
2.5 VENTING
WARNING
POISONOUS CARBON MONOXIDE GAS,FIRE AND EX-
PLOSION HAZARD.
Read and follow all instructions in this section.
Never install a hand operated damper in the vent
pipe. However, any Underwriters Laboratories
listed, electrically operated automatic type vent
damper may be installed if desired. Be sure to
follow the instructions provided with vent damper.
Also, read and follow all instructions in this sec-
tion of the manual.
Failure to properly vent this furnace or other ap-
pliances can result in death, bodily injury and/or
property damage.
To ensure the safe and proper functioning of an oil fur-
nace, it must always be connected to a flue with sufficient
draft or to an approved side-wall venting system. In ad-
dition, it is strongly recommended to perform a complete
inspection of all the existing venting systems.
2.5.1 Masonry chimney
This furnace can be vented into an existing masonry
chimney. However, the unit must not be vented into a
chimney into which a solid fuel burning furnace is al-
ready being vented.
Before venting this furnace into a chimney, its condition
must be checked and repairs made, if necessary. Also,
7

the chimney lining and dimensions must conform to local
and national codes.
2.5.2 Factory-built chimneys
Oil fired furnaces are approved for use with “L” type
vents. The unit may also be used with an approved
chimney of proper dimensions and temperature ratings
as specified in the installation code. Refer to chimney
manufacturer’s instructions for proper installation.
2.5.3 Draft regulator
It is recommended that a draft regulator be installed in
cases where the draft is either high or variable due to
external conditions. Follow the instructions provided with
the regulator.
2.5.4 Side wall venting
The heating unit is approved for side-wall venting.
This system includes model VTK-54 / VTK-098 /
KLAVT0101DET side-wall venter and a 4” insulated vent
pipe, model IFV-410 / IFV098-10 / KLAFV0101DET, IFV-
420 / IFV098-20 / KLAFV0201DET. Refer to the installa-
tion instructions provided with the venting system.
2.6 BLOCKED VENT SHUT-OFF
DEVICE (BVSO) FOR CHIMNEY
VENTING
CAUTION
It is imperative that this device be installed by a quali-
fied service technician.
A positive pressure venting system (Sealed Combus-
tion System or Direct Vent) MUST NOT use the BVSO.
Follow the instructions supplied with the venting sys-
tem.
This device is designed to detect the insuf-
ficient evacuation of combustion gases in the
event of a vent blockage. In such a case
the thermal switch will shut down the oil burner.
The device will then need to be re-armed MANUALLY.
Refer to the detailed instructions and wiring diagrams
supplied with the BVSO for the installation and wiring
procedures. The length of wires supplied with the unit
is such that the safety device must be installed between
the flue outlet of the appliance and the draft regulator, as
indicated in the instructions.
It is also essential that the BVSO be maintained annually.
For more details refer to the instructions supplied with the
device itself, as well as in section 4 of this Manual.
2.6.1 BVSO Functional Test
The purpose of the following test is only to check that the
electrical outlet on the furnace, designated to the BVSO,
is functional only.
1. Start up the burner;
2. Remove the three-pole plug from the BVSO outlet
on the furnace;
3. The burner must shut-off immediately, while the
blower continues to run to the end of the cool-down
cycle.
If the test is not in line with the above, call a QUALIFIED
SERVICE TECHNICIAN.
2.7 COMBUSTION AIR SUPPLY
AND VENTILATION
WARNING
POISONOUS CARBON MONOXIDE GAS HAZARD.
Comply with NFPA 31 (U.S.) and CSA B139
(Canada) standards for the installation of Oil Burn-
ing Equipment and applicable provisions of local
building codes to provide combustion and ventila-
tion air.
Failure to provide adequate combustion and ven-
tilation air can result in death, bodily injury and/or
property damage.
Oil furnaces must have an adequate supply of combus-
tion air. It is common practice to assume that older
homes have sufficient infiltration to accommodate the
combustion air requirement for the furnace. However,
home improvements such as new windows, doors, and
weather stripping have drastically reduced the volume of
air infiltration into the home.
Refer to oil furnace installation codes relative to com-
bustion and ventilation air requirements. Consult Section
2.1.1 in this manual, specifically for units installed in an
enclosed space.
Home air exhausters are common. Bathroom and
kitchen fans, power vented clothes dryers and water
heaters all tend to create a negative pressure condition in
the home. Should this occur the chimney becomes less
and less effective and can easily downdraft. In certain
cases, mechanically supplied air, by way of a blower, in-
terlocked with the unit, is necessary. It is the installer’s
responsibility to check that.
8

2.7.1 Contaminated Combustion Air
Installations in certain areas or types of structures will in-
crease the exposure to chemicals or halogens that may
harm the furnace. These conditions will require that only
outside air be used for combustion.
The following areas or types of structures may contain or
be exposed to certain substances, potentially requiring
outside air for combustion:
1. Commercial buildings;
2. Buildings with indoor pools;
3. Furnaces installed near chemical storage areas.
Exposure 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 chemicals;
f) Carbon Tetrachloride;
g) Halogen type refrigerants;
h) Cleaning solvents (such as perchloroethylene);
i) Printing inks, paint removers, varnishes, etc. ;
j) Hydrochloric acid;
k) Solvent based glue;
l) Antistatic fabric softeners for clothes dryers;
m) Acid based masonry cleaning materials.
2.7.2 Burner with Outdoor Combustion Air
Kit
Some burners are designed to function with combustion
air taken directly from the outside. Follow the instructions
provided with the burner, the fresh-air supply kit or the
side-wall venting kit.
2.8 OIL TANK
WARNING
FIRE AND EXPLOSION HAZARD.
Use only approved heating type oil in this furnace.
DO NOT USE waste oil, used motor oil, gasoline or
kerosene.
Use of these will result in death, bodily injury
and/or property damage.
CAUTION
When a 0,75 USGPH or smaller nozzle is used, a 10
micron or finer filter must be installed on the oil sup-
ply line to the furnace inside the building where it is
located.
This is a requirement in order for the heat exchanger
warranty to remain in force.
Check your local codes for the installation of the oil tank
and accessories.
At the beginning of each heating season or once a year,
check the complete oil distribution system for leaks.
Ensure that the tank is full of clean oil. Use No.1 or No.2
Heating Oil (ASTM D396 U.S.) or in Canada, use No.1 or
No.2 Furnace Oil.
A manual shut-off valve and an oil filter shall be installed
in sequence from tank to burner. Be sure that the oil
line is clean before connecting to the burner. The oil
line should be protected to eliminate any possible dam-
age. Installations where the oil tank is below the burner
level must employ a two-pipe fuel supply system with an
appropriate fuel pump. A rise of 2.4 m (8’) and more
requires a two stage pump and a rise greater than 4.9 m
(16’) an auxiliary pump. Follow the pump instructions to
determine the size of pipe needed in relation to the rise
or to the horizontal distance.
2.9 DUCTING
WARNING
POISONOUS CARBON MONOXIDE GAS HAZARD.
DO NOT draw return air from inside a closet or util-
ity room. Return air MUST be sealed to the furnace
casing.
Failure to properly seal ducts can result in death,
bodily injury and/or property damage.
The ducting must be designed and installed according to
approved methods, local and national codes as well as
good trade practices.
When ducting supplies air to a space other than where
the furnace is located, the return air must be sealed and
also be directed to the space other than where the fur-
nace is located.
2.9.1 Air filter
A properly sized air filter must be installed on the return
air side of the unit. Refer to the Technical Specifications
in Table 7, for the correct dimensions. Also refer to Sec-
tion ?? and the instructions supplied with the filter.
9

2.10 SUPPLY AIR ADJUSTMENTS
(4 SPEED MOTORS)
On units equipped with 4-speed blower motors, the sup-
ply air must be adjusted based on heating/air condition-
ing output and the static pressure of the duct system. For
the desired air flow refer to Table 1 as well as the table 9
based on static pressure in the Technical Specifications
section of this manual.
Figure 5 – Blower “OFF” delay - Board #ST9103A
To effect the adjustment, the RED (for heating) and BLUE
(for cooling and heat pump) wires can be changed on the
motor. Also, refer to the position of the wires on the
electronic board of the unit and consult the wiring dia-
grams. If the heating and air conditioning speeds are
the 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 adjusted by position-
ing the DIP switches on the electronic board as shown in
the following figures. For upflow installation, the recom-
mended blower ON delay is 60 seconds and blower OFF
delay 2 minutes.
Figure 6 – Blower Start/Stop Delays - Board#1158
Carte#1158 Board
Table 1 – Blower speed adjustments, heating mode, 4-speed motor
HEATING
CAPACITY
(USGPH)
STATIC
PRESSURE
(w.c.)
RECOMMENDED
BLOWER SPEED
0.90 0.25” MED-LOW
0.90 0.50” MED-LOW
1.10 0.25” MED-HIGH
1.10 0.50” MED-HIGH
10

Table 2 – Blower speed adjustments, 4-speed motor
A/C CAPACITY (TONS) RECOMMENDED
BLOWER SPEED
3.0 LOW
3.5 MED-LOW
4.0 MED-HIGH
4.5 HIGH
11

2.11 SUPPLY AIR ADJUSTMENTS
(ECM VARIABLE SPEED
MOTORS)
On units equipped with ECM variable speed blower mo-
tors, the air supply must be adjusted based on heating/air
conditioning output. The start/stop delays of the blower
must also be adjusted by positioning the DIP switches on
the electronic board.
Refer to the following tables, airflow tables and the wiring
diagram in this manual for the proper settings.
Table 3 – Airflow adjustments - Heating mode
SW1-HEAT INPUT
DIP Switch Positions USGPH
1 2 POSITION
OFF OFF A 0.90
ON OFF B 1.10
OFF ON C* N/A
ON ON D* N/A
*Alternate adjustments for a higher air temperature rise
Table 4 – Airflow adjustments - Air conditioning
mode
SW2-COOL INPUT
DIP Switch Positions USGPH
1 2 POSITION
OFF OFF A 5.0
ON OFF B 4.0
OFF ON C 3.5
ON ON D 3.0
Table 5 – Airflow adjustments - All modes
SW3-ADJ (Adjustment) CFM HT G. CFM A/G.
DIP Switch Positions % Increase % Increase
1 2 POSITION or decrease or decrease
OFF OFF A 0% 0%
ON OFF B 10% 10%
OFF ON C -10% -10%
ON ON D N/A 0%
Table 6 – Delay adjustments - Heating mode
SW4-Delay INPUT
DIP Switch Positions USGPH
1 2 POSITION
OFF OFF A 0.90
ON OFF B 1.10
OFF ON C 1.10
ON ON D* N/A
*Alternate adjustments for both input rate (refer to air-
flow table)
2.12 INSTALLATION OF
ACCESSORIES
WARNING
ELECTRICAL SHOCK HAZARD.
Turn OFF electrical power at the fuse box or ser-
vice panel before making any electrical connec-
tions and ensure a proper ground connection is
made before connecting line voltage.
Failure to do so can result in death or bodily injury.
2.12.1 Humidifier (HUM)
The electronic board supplies 120 VAC for a humidifier
on the HUM terminal. It supplies 120 VAC electric power
when the burner is in operation.
A 24 VAC signal can also be supplied from the W and
C terminals on the blower electronic board to activate a
switching relay.
Also refer to the instructions supplied with the accessory.
2.12.2 Electronic Air Cleaner (EAC)
The EAC terminal on the electronic board supplies 120
VAC when the blower is operating in the heating or air
conditioning mode. This signal can be used to activate an
electronic air cleaner that is not equipped with an air flow
switch. If the cleaner is equipped with an air flow switch,
12

the S terminal on the PSC electronic board or one of the
120 VAC terminals on the ECM electronic board can be
used to provide a constant supply of 120 VAC.
Also refer to the instructions supplied with the accessory.
2.12.3 Air Conditioner (or Heat Pump)
An air conditioning coil may be installed on the supply air
side ONLY.
WARNING
POISONOUS CARBON MONOXIDE GAS HAZARD.
Install the evaporator coil on the supply side of the
furnace ducting ONLY.
An evaporator coil installed on the return air side
of the ducting can cause condensation to form
inside the heat exchanger, resulting in heat ex-
changer failure. This in turn, can result in death,
bodily injury and/or property damage.
A clearance of 15 cm (6") is required between the bottom
of the coil drain pan and the top of the heat exchanger.
If a heat pump is installed, a “dual-energy” thermostat,
or other control is required, in order to prevent the simul-
taneous operation of the furnace and the heat pump. It
also prevents a direct transition from heating by way of
the heat pump to heating with oil. Refer to the thermo-
stat instructions or those of another control used for the
proper wiring.
If a coil blower compartment is used, install air tight, mo-
torized and automatic air dampers. Cold air coming from
the coil and passing across the furnace can cause con-
densation and shorten the life of the heat exchanger.
2.12.4 Emergency Heating Mode - variable
speed Motor (ECM)
If the ECM blower motor is defect and that no spare are
available right away, you can temporarily replace it with a
conventional fractional PSC blower motor. Connect neu-
tral wire to neutral terminal on the control panel of the
machine and the hot line to the EAC terminal. This one
is working as long as heating or cooling is requested, and
the blower will work until a new ECM motor is installed.
CAUTION
We recommend to use this mode only for a short pe-
riod of time since it affects the efficiency of the unit and
the user comfort..
3 OPERATION
3.1 START-UP
CAUTION
DO NOT START THE BURNER UNLESS THE
BLOWER ACCESS DOOR IS SECURED IN PLACE.
Before starting up the unit, be sure to check that
the following items are in compliance:
1) The electrical installation, the oil supply system, the
venting system, combustion air supply and ventila-
tion;
2) The blower access door is in place and the blower
rail locking screws are well tightened;
3) The Blocked Vent Shut-Off (BVSO) is installed ac-
cording to instructions (for chimney venting);
4) The oil supply valve is open;
5) The burner ‘’Reset” button is well pushed in or re-
armed;
6) The preliminary air adjustments on the burner com-
ply with the technical specifications in this manual;
7) The blower speed adjustments for heating and air
conditioning are appropriate and according to the
specifications in this manual;
8) The blower start/stop delays are satisfactory;
9) The thermostat of the room is in the heating mode
and is set higher than the ambient temperature.
To start the unit, turn the main electrical switch on.
3.2 OPERATING SEQUENCE OIL
HEATING MODE
1) The W-R contact closes;
2) The burner motor starts up to pre-purge the com-
bustion chamber for a period of 10 to 15 seconds.
During that time a spark is established on the elec-
trodes;
3) The solenoid valve opens and a flame is estab-
lished. Shortly after, the electrodes cease to spark;
4) Then the blower runs up to full speed. The delay
depends on the adjustments that were made on the
electronic board, which controls the blower motor.
Refer to Sections 2.10 and 2.11 above as well as to
the airflow tables 8 and 9 for more details.
13

5) When the call for heat is satisfied, the solenoid
valve closes, the flame goes out and the burner mo-
tor stops (after post purge delay, if applicable).
6) The blower stops shortly after the burner. The de-
lay depends on the adjustments that were made on
the electronic board that controls the blower. Refer
to Sections 2.10 and 2.11 above as well as to the
airflow table 8 and 9 for more details.
Note: A detailed operating sequence of the oil burner is
outlined in the instructions provided with the burner.
3.3 CHECKS AND ADJUSTMENTS
3.3.1 Purging the oil line
Open the bleed port screw and start the burner. Allow
the oil to drain into a container for at least 10 seconds.
The oil should flow absolutely free of white streaks or
air bubbles to indicate that no air is being drawn into the
suction side of the oil piping and pump. Slowly close and
tighten the bleed screw. Once closed, the flame will light
up.
3.3.2 Pressure adjustment
The oil pressure must be adjusted according to the Tech-
nical Specifications of this manual. An adjustment screw
and a connection for a pressure gauge are located on
the oil pump for that purpose. Also refer to the burner
instruction manual.
3.3.3 Combustion Check
IMPORTANT
The heat exchanger metal surfaces may have oil and
the baffle insulation also contains binders. These
products will burn or evaporate when the unit oper-
ates for the first time. Because of this, the smoke
reading may be inexact during the first minutes of
operation. Therefore, the unit must operate during
at least 60 minutes before taking any readings to ad-
just the combustion quality. Let the unit cool down be-
fore making any adjustments.
IMPORTANT
The combustion check verification MUST be per-
formed after the nozzle replacement or the burner
cleaning. After these manipulations, the combustion
parameters are necessarily modified. Refer also to the
burner instruction manual.
1. Drill a test hole in the flue pipe, approximately 18
inches from the furnace breech. Insert the smoke
test probe into the hole. For installation using a
sidewall venting, use the orifice provided on the
breech plate;
2. From a cold start, let the unit operate for about 5
minutes;
3. Set the burner air setting until you have between 0
and 1 on the Bacharach Scale (or a “trace”);
4. Take a CO2 sample at the same test location where
the #1 smoke reading was taken and make note of
it. Example: 13.8% of CO2 or 2.5% of O2;
5. the burner air setting to obtain a CO2 reading 1.5%
lower (or a O2 reading 2.0% higher) than the read-
ing associated with the “trace” of smoke. Example:
12.3% of CO2 or 4.5% of O2;
6. This method of adjusting the burner will result
in clean combustion (Bacharach smoke scale be-
tween 0 and a trace) and ensure the proper func-
tioning of the system. The optimum CO2 level is
around 12% to 13% (or 3.5% to 5.0% of O2).
3.3.4 Draft Regulator adjustment
On chimney installations only, a barometric draft regula-
tor (supplied with the furnace) must be installed, in order
to ensure proper draft through the furnace. The baro-
metric damper must be mounted with the hinge pins in
a horizontal position and the face of the damper vertical
for proper functioning (see instructions included with the
damper.) After the furnace has been firing for at least
five minutes, the draft regulator should be set to between
-0.025" and -0.060" W.C.
3.3.5 Overfire pressure test
The overfire draft that is taken through the observation
port, located above the burner, is a measurement neces-
sary to determine if there is a blockage in the heat ex-
changer or the flue pipe. Refer to the Technical Specifi-
cations in this manual for overfire pressure values. A high
pressure condition may be caused by excessive combus-
tion air, due to the air band being too wide open, or a
lack of flue draft (chimney effect) or some other block-
age, such as soot in the secondary section of the heat
exchanger or the use of an oversize nozzle input or high
pressure pump.
3.3.6 Vent Temperature Test
1. After having adjusted the burner combustion, insert
a thermometer into the test hole in the breech pipe;
2. The total vent temperature should be between 204
and 302°C (400 and 575°F). If not, check for im-
proper air temperature rise, pump pressure, nozzle
size or a badly sooted heat exchanger.
14

CAUTION
Low flue gas temperature increases the risk of con-
densation. Adjust the total temperature at or higher
then 204°C (400°F) in order for the heat exchanger
warranty to remain in force.
3.3.7 Supply Air Temperature Rise Test
1. Operate the burner for at least 10 minutes;
2. Measure the air temperature in the return air
plenum;
3. Measure the air temperature in the largest trunk
coming off the supply air plenum, just outside the
range of radiant heat from the heat exchanger. 0.3
m (12") from the plenum of the main take-off is usu-
ally sufficient;
4. The temperature rise is calculated by subtracting
the return air temperature from the supply air tem-
perature;
5. If the temperature rise is lower or exceeds the tem-
perature specified in Table 7, change to the next
lower or higher blower speed tap, until the temper-
ature rise falls to the target. If the excessive tem-
perature rise cannot be increased or reduced by
changing fan speed, investigate for ductwork ob-
structions, dirty or improper air filter, improper firing
caused by improper pump pressure or nozzle siz-
ing.
3.3.8 Limit control check
After operating the furnace for at least 15 minutes, re-
strict the return air supply by blocking the filters or the
return air register and allow the furnace to shut off on
High Limit. The burner will shut off but the blower will
continue to run.
Remove the obstruction and the burner should restart
after a few minutes. The time required for the restart also
depends on the adjustment of the blower “OFF” delay.
3.3.9 Restart after Burner Failure
1. Set the thermostat lower than room temperature;
2. Press the reset button on the burner primary control
(relay);
3. Set the thermostat higher than room temperature;
4. If the burner motor does not start or ignition fails,
turn off the disconnect switch and CALL A QUALI-
FIED SERVICE TECHNICIAN.
CAUTION
Do not attempt to start the burner when excess oil
has accumulated, when the furnace is full of vapour or
when the combustion chamber is hot.
4 MAINTENANCE
WARNING
ELECTRICAL SHOCK HAZARD.
Turn OFF power and fuel to the furnace before any
disassembly or servicing.
Failure to do so can result in death, bodily injury
and/or property damage.
Preventive maintenance is the best way to avoid unnec-
essary expense and inconvenience. Have your heating
system and burner inspected by a qualified service tech-
nician at regular intervals and after extended periods of
shutdown.
To maintain the reliability and optimal performance of the
furnace, have a complete combustion check done after
the annual maintenance call. Do not attempt to repair the
furnace or its controls. Call a qualified service technician.
ALWAYS KEEP THE OIL SUPPLY VALVE SHUT OFF IF
THE BURNER IS SHUT DOWN FOR AN EXTENDED
PERIOD OF TIME.
Before calling for repair service check the following
points:
1. Check the oil tank gauge and make sure that the
valve is open;
2. Check fuses and the circuit breaker;
3. Check if the main disconnect switch is ON ;
4. Set the thermostat above room temperature;
5. If ignition does not occur, turn off the disconnect
switch and call a qualified service technician.
When ordering replacement parts, please specify the
complete furnace model number and serial number.
4.1 CLEANING THE HEAT
EXCHANGER
It is not generally necessary to clean the heat exchanger
or flue pipe every year, but it is advisable to have the
oil burner service technician check the unit before each
heating season to determine whether the cleaning or re-
placement of parts is necessary.
15

If a cleaning is necessary, the following steps should be
performed:
1. Turn OFF all utilities upstream from the furnace;
2. Disconnect the flue pipe;
3. Remove the flue collar panel located at the front of
the furnace;
4. Remove the heat exchanger baffles;
5. Disconnect the oil line and remove the oil burner;
6. Clean the secondary tubes and the primary cylin-
der with a stiff brush and a vacuum cleaner;
7. Before re-assembling the unit, the heat exchanger
and combustion chamber should be inspected to
determine if replacement is required;
8. After the cleaning, replace the heat exchanger baf-
fles, flue collar plate and oil burner;
9. Readjust the burner for proper operation.
4.2 CLEANING THE BLOCKED
VENT SHUT-OFF DEVICE
(BVSO)
For continuous safe operation, the Blocked Vent Shut-off
device (BVSO) must be inspected and maintained annu-
ally by a qualified service technician.
1. Disconnect power to the appliance;
2. Remove the two screws holding on the BVSO as-
sembly cover;
3. Remove the cover;
4. Remove the two screws holding the control box to
the heat transfer tube assembly. Sliding the control
box in the appropriate direction will unlock it from
the heat transfer tube assembly;
5. Carefully remove any build-up from the thermal
switch surface;
CAUTION
Do not dent or scratch the surface of the thermal
switch. If the thermal switch is damaged it MUST
be replaced.
6. Clean and remove any build-up or obstruction in-
side the heat transfer tube;
7. Re-mount, lock and fasten the control box with the
2 screws removed in step 4;
8. Re-attach the assembly cover with the screws re-
moved in step 2;
9. Re-establish power to the unit.
4.3 CLEANING THE BURNER
HEAD
Once a year, remove the retention head and electrodes
from the drawer assembly and remove all foreign matter,
if necessary. Also clean the extremity of the burner tube,
if necessary.
4.4 REPLACING THE NOZZLE
Change the nozzle once a year with the one specified in
Table 7.
4.5 REPLACING THE OIL FILTER
Tank Filter
The tank filter should be changed as required. Follow the
manufacturer’s instructions.
Secondary Filter
The 10 micron, or finer, filter cartridge should be changed
annually. Follow the manufacturer’s instructions.
4.6 CHANGING THE AIR FILTER
Dirty filters have an impact on the efficiency of the fur-
nace and increase fuel consumption.
Air filters should be changed at least once a year. Very
dusty conditions, the presence of animal hair and the like
will require more frequent changing or cleaning.
16

5 FURNACE INFORMATION
Model: .................................................. Serial number: ..........................................
Furnaceinstallationdate: ...............................
Servicetelephone # -Day: .............................. Night: ...................................................
Dealer name andaddress: ..............................
..........................................................
..........................................................
START-UP RESULTS
Nozzle: ........ Pressure: ............................................... lb/po2
Burneradjustments: Primary air ..............................................
Fineair .................................................
Drawer Assembly .......................................
%CO2: ........ Smokescale: ........................................... (Bacharach)
Grossstacktemperature: .......................................................°F
Ambient temperature: .......................................................°F
Chimneydraft: ....................................................”W.C.
Overfiredraft: ....................................................” W.C.
Test performed by: ..........................................................
17

6 TECHNICAL SPECIFICATIONS
Table 7 – Technical specifications
154 Lowboy Series UNITS WITH 1.0 HP 4-SP. MOTOR UNITS WITH 1.0 HP ECM MOTOR
RATING AND PERFORMANCE
Firing rate(USGPH)* 0.90 1.10 0.90 1.10
Input (BTU/h)* 126,000 154,000 126,000 154,000
Heating temperature rise (Degr. F)* 55 - 75 Degr. F 60 - 72 Degr. F
Flue draft with chimney (inch of w.c.) -0.06 to -0.025 -0.06 to -0.025
Overfire pressure with chimney (inch of w.c.) -0.035 to +0.025 -0.035 to +0.025
Flue pressure with direct vent (inch of w.c. - no wind) +0.05 to +0.12 +0.05 to +0.12
Overfire pressure with direct vent (inch of w.c. - no wind) +0.06 to +0.16 +0.06 to +0.16
BECKETT BURNER; NX MODEL (Chimney or DV)/ Insertion NX50LC / 1 3/4” NX50LC / 1 3/4”
AHRI Model # OLR126-BNX OLR154-BNX OLV126-BNX OLV156-BNX
Maximum Heating capacity, (BTU/h)* 106,000 128,000 106,000 128,000
Head type 6 Slots - LC head 6 Slots - LC head
Nozzle (Delavan)** 0.75 - 60B 0.90 - 60B 0.75 - 60B 0.90 - 60B
Pump pressure (PSIG)* 145 150 145 150
Head/Air setting 2.5 3.25 2.5 3.25
AFUE % (From CSA B212 standard and Canadian regulation)*** 87.7% 86.7% ‡ 87.7% ‡ 86.7%
AFUE % (From ASHRAE 103 standard and US regulation)*** 86.6% 85.5% ‡ 86.6% ‡ 85.5%
RIELLO BURNER; 40-F5 MODEL (Chimney)/ Insertion F5 WITH AIR INLET DAMPER/ 2 3/4” F5 WITH AIR INLET DAMPER2 3/4”
AHRI Model # OLR126-RF OLR154-RF OLV126-RF OLV156-RF
Maximum Heating capacity, (BTU/h)* 106,000 128,000 106,000 128,000
Nozzle (Delavan)** 0.75 - 70A 0.90 - 70A 0.75 - 70A 0.90 - 70A
Pump pressure (PSIG)* 145 150 145 150
Combustion air adjustment (turbulator/damper) 1.5 / 2.25 2.5 / 2.75 1.5 / 2.25 2.5 / 2.75
AFUE % (From CSA B212 standard and Canadian regulation*** 87.6% 86.8% ‡ 87.6% ‡ 86.8%
AFUE % (From ASHRAE 103 standard and US regulation)*** 86.6% 85.8% ‡ 86.6% ‡ 85.8%
RIELLO BURNER; 40-BF5 MODEL (Direct vent DV)/ Insertion BF5 / 2 3/4” BF5 / 2 3/4”
AHRI Model # OLR126-RBF OLR154-RBF OLV126-RBF OLV156-RBF
Maximum Heating capacity, (BTU/h)* 107,000 129,000 107,000 129,000
Nozzle (Delavan)** 0.75 - 70A 0.90 - 70A 0.75 - 70A 0.90 - 70A
Pump pressure (PSIG)* 145 150 145 150
Combustion air adjustment (turbulator/damper) 1.0 / 3.75 3.0 / 4.25 1.0 / 3.75 3.0 / 4.25
AFUE % (From CSA B212 standard and Canadian regulation)*** 87.7% 86.1% ‡ 87.7% ‡ 86.1%
AFUE % (From ASHRAE 103 standard and US regulation)*** 87.5% 86.2% ‡ 87.5% ‡ 86.2%
ELECTRICAL SYSTEM
Volts - Hertz - Phase 115 - 60 - 1 115 - 60 - 1
Rated current (Amps) 16.9 15.7
Minimum ampacity for wire sizing (Amps) 19.5 18.1
Max. fuse size (Amps) 20 20
Control transformer(VA) 40 40
External control power available: Heating (VA) 40 40
External control power available: Cooling (VA) 30 30
BLOWER DATA
Heating blower speed at 0.25" W.C. SP MED-LOW MED-HIGH
See the ECM air flow table
Heating blower speed at 0.50" W.C. SP MED-LOW MED-HIGH
Motor (HP) / number of speeds 1 HP / 4 speeds 1 HP / ECM (with power choke)
Blower size (diam. x width) 12” x 10” (tight housing) 12” x 10” (tight housing)
GENERAL INFORMATION
Overall dimensions (width x depth x height) 24 3/4” x 52” x 39 1/4” 24 3/4” x 52” x 39 1/4”
Supply air opening (width x depth) 23 3/4” x 23 3/4” 23 3/4” x 23 3/4”
Return air opening (width x depth) 23 3/4” x 19 3/4” 23 3/4” x 19 3/4”
Filters size and quantity 20” x 24” x 1" or 2” (quantity=1) 20” x 24” x 1" or 2” (quantity=1)
16” x 24” x 1" (quantity=2) 16” x 24” x 1" (quantity=2)
Shipping weight Lbs/Kg 270 / 122.5 270 / 122.5
Air conditioning, maximum output (tons) at 0.5" W.C. SP 5.0 5.0
Note 1 : Without low firing baffle #5880
* INPUT AND OUTPUT ADJUSTMENT :
‡=
- Pump pressure can be adjusted to maintan proper firing rate
- Increase pump pressure if flue gases’ temperature is under 400°F
- Adjust the total flue gas temperature between 400°F and 575 °F (330°and 505°F net approx.)
- Adjust fan speed for air temperature rise to be in specified range
** Default installed nozzle in bold character.
*** AFUE value established after minimum 20 hours of operation.
18

Table 8 – Airflow data, models with 1.0 HP ECM motor
OIL HEATING MODE
24 VAC input (R) on W only
SW1- HEAT HEAT INPUT CFM with SW3-ADJ
DIP switch position A
CFM with SW3-ADJ
DIP switch position B
CFM with SW3-ADJ
DIP switch position C
DIP switch position (USGPH)
A (1=OFF, 2=OFF) 0090 1450 1595 1305
B (1=ON, 2=OFF) 1.10 1700 1875 1535
C (1=OFF, 2=ON) Settings not used in this mode
D (1=ON, 2=ON)
CONTINUOUS FAN
24 VAC input (R) on G only
SW2 - COOL DIP switch
position A/C size (TON) CFM with SW3-ADJ DIP switch position A
CFM with SW3-ADJ
DIP switch position B
CFM with SW3-ADJ
DIP switch position C
A (1=OFF, 2=OFF) 5.0 1500 1730 1275
B (1=ON, 2=OFF) 4.0 1200 1380 1020
C (1=OFF, 2=ON) 3.5 1050 1210 895
D (1=ON, 2=ON) 3.0 900 1040 775
COOLING OR HEAT PUMP HEATING MODE
24 VAC input (R) to G, Y/Y2 and O (for cooling)
SW2 - COOL DIP switch
position A/C size (TON) CFM with SW3-ADJ DIP switch position A
CFM with SW3-ADJ
DIP switch position B
CFM with SW3-ADJ
DIP switch position C
A (1=OFF, 2=OFF) 5.0 2000 2200 1800
B (1=ON, 2=OFF) 4.0 1600 1760 1440
C (1=OFF, 2=ON) 3.5 1400 1540 1260
D (1=ON, 2=ON) 3.0 1200 1320 1080
In cooling - Dehumidification mode, with no 24 VAC input to DH, the CFMs are reduced by 15%.
The CFMs shown are reduced by 20% if there is 24 VAC input to Y1 (first stage of the 2-stage cooling unit)
DELAY PROFILE FOR OIL HEATING MODE
SW4 - DELAY DIP switch
position
HEAT IN-
PUT(USGPH)
PreRun On-Delay
CFM Level - Time
ShortRun On-Delay
CFM Level - Time
Off-Delay CFM Level -
Time
A (1=OFF, 2=OFF) 0.90 13% - 45 sec. 44% - 30 sec 38% - 3 min.
B (1=ON, 2=OFF) 1.10 13% - 30 sec. 44% - 30 sec 38% - 3 min.
C (1=OFF, 2=ON) 1.10 13% - 30 sec. 50% - 30 sec 38% - 3 min.
D (1=ON, 2=ON) Settings not used in this mode
PreRun and ShortRun are the periods of time when the blower strats at very low CFM to minimize the distribution of
cool air in the system and then runs up to normal speed.
Off Delay is the time required to cool down the heat exchanger with low CFMs, to minimize cool draft in the air distribution
system.
DELAY PROFILE FOR COOLING OR HEAT PUMP HEATING MODE
No adjustment required A/C size PreRun On-delay
CFM Level - Time
ShortRun On-delay
CFM Level - Time
Off-Delay CFM level -
Time
- All NO DELAY NO DELAY 100% - 90 sec
*Alternate adjustment in oil-fired heating mode with higher temperature rise
19