Step 5—Oil Burner
This furnace is supplied with a high-pressure atomizing retention
head-type burner (for use with grade 1 or 2 Fuel Oil). The Riello
oil burner operates with a prepurge period of 10 sec and a safety
timing of 5 sec. The burner flange is factory installed for an
insertion length of 3-3/4-in. The oil pump is set to operate on a
single line system. To operate on a two-line system the by-pass
plug must be installed.
Step 6—Oil Connections
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component
damage.
This burner is shipped with the oil pump set to operate on a
single line system. To operate on a two-line system the
by-pass plug must be installed. Do not operate a single line
system with the by-pass plug installed. Operating a single line
system with the by-pass plug installed will result in damage to
the pump shaft seal. Pump pressure must be set at time of
burner start-up. A pressure gauge is attached to the PRES-
SURE PORT for pressure readings. Two PIPE CONNEC-
TORS are supplied with the burner for connection lines to
burner pipe connectors. All pump port threads are British
Parallel Thread design. Direct connection of NPT threads to
the pump will damage the pump body. Riello manometers
and vacuum gauges do not require any adapters, and can be
safely connected to the pump ports. An NPT (metric) adapter
must be used when connecting other gauge models.
Complete instructions for installing fuel oil piping can be found in
oil burner Installation Instructions included with furnace.
Oil line entry holes are provided in side panels. Two holes are
provided in each location so that a 2-pipe system may be used if
desired.
An oil filter should be used with all oil burners and should be
installed as close to burner as possible.
Step 7—Barometric Draft Control
The barometric draft control shipped with furnace MUST be used
with furnace to ensure proper operation. Instructions for installing
control are packed with control.
Step 8—Electrical Connections
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in serious injury,
death, or property damage.
The unit cabinet must have an uninterrupted or unbroken
electrical ground to minimize personal injury if an electrical
fault should occur. A green ground screw is provided in
control box for this connection.
115V WIRING
Before proceeding with electrical connections, make certain that
voltage, frequency, and phase correspond to that specified on unit
rating plate. Also, check to be sure that service provided by utility
is sufficient to handle load imposed by this equipment. Refer to
rating plate or Table 7 for equipment electrical specifications.
Make all electrical connections in accordance with National
Electrical Code (NEC) ANSI/NFPA 70-2001 and any local codes
or ordinances that might apply. For Canadian installations, all
electrical connections must be made in accordance with Canadian
Electrical Code CSA C22.1 or subauthorities having jurisdiction.
FIRE HAZARD
Failure to follow this warning could result in serious injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch
and furnace. Use only copper wire.
The control system depends on correct polarity of power supply.
Connect HOT wire (H) and NEUTRAL wire (N) as shown in Fig.
4.
A separate line voltage supply MUST be used with a fused
disconnect switch or circuit breaker between main power panel
and unit. (See Fig. 4.)
Metallic conduit (where required/used) may terminate at side panel
of unit. It is not necessary to extend conduit inside unit from side
panel to control box.
When replacing any original furnace wiring, use only 105°C No.
14 AWG copper wire.
24–V WIRING
Instructions for wiring thermostat (field supplied) are packed in
thermostat box. Make thermostat connections as shown in Fig. 5 to
8 at 24-v terminal board on electronic control board. Thermostat
wire connections at R and W are the minimum required for oil
heating operation.
ACCESSORY INSTALLATION
1. General
When installing optional accessories to this appliance, follow
manufacturer’s Installation Instructions included with acces-
sory. Other than wiring for thermostat, wire with a minimum
of type
″
T
″
insulation (63°F rise) must be used for accessories.
2. Auxiliary Terminals
The HUM 120 VAC terminals on the electronic control board
are tied directly to the #8 pin of the 9 pin connector and
provide a 120 VAC signal whenever the burner is energized.
(See Fig. 4.) Supplementary 120 VAC and neutral terminals
can be used for accessory wiring. See Electronic Air Cleaner
and Humidifier sections for further information.
3. Electronic Air Cleaner Connections
When using an electronic air cleaner with variable-speed
oil-fired furnaces, use an Airflow Sensor kit. As the air cleaner
is connected to constant 120 VAC power, the airflow sensor
turns on the electronic air cleaner when the furnace blower is
operating.
4. Humidifier/Humidistat Connections
To ensure humidifier will operate properly, use HUM output
of Humidistat Control to control humidifier operation. A
24-VAC signal can be connected from the W and C on
terminal block connections on the electronic board or a 120
VAC signal from the
″
HUM 120 VAC
″
terminal when
primary heating source is used. (See Fig. 4-8.)
5. Dehumidify Capability with Standard Humidistat Connection
Latent capabilities for systems using the variable-speed oil-
fired furnaces are better than average systems. If increased
latent capacity is an application requirement, the field wiring
terminal block provides connection terminals for use of a
standard humidistat.
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