Pentax R7184A User Manual

R7184A,B,P,U

Interrupted Electronic Oil Primary

INSTALLATION INSTRUCTIONS

APPLICATION

The R7184A,B,P,U Interrupted Electronic Oil Primary is a line voltage, safety rated, interrupted ignition oil primary control for residential oil fired burners used in boiler s, forced air furnaces and water heaters. The R7184A,B,P, U used with a cad cell flame sensor, operates an oil burner and optional oil valve. The primary controls fuel oil, senses flame, controls ignition spark and notifies a remote alarm circuit when in lockout.

The R7184 can be used with both hydronic and forced air systems. When used with hydronic systems, line voltage switching Aquastat® Controllers normally provide for the starting and stopping of the combustion sequences. With forced air systems, both mechanical and electron ic low voltage thermostats control the starting and stopping of the combustion process.

Some hydronic and forced air systems now require a delayed valve-on and burner motor-off delay. The R7184 operates an oil valve that prevents the flow of oil when the burner motor is running prior to combustion (delayed valve-on) and when the burner motor is running after combustion (burner motor-off delay).

The R7184 models are intended for use only on oil burning appliances which do not require prep ur ge and post-purge as a safety related function as defined in U L

296. The valve-on delay and burner motor-off delay in this control are intended only to help establish draf t an d reduce oil after-drip related problems.

FEATURES

Limited Recycle

This feature limits the number of recycle trials (for each call for heat) to a maximum of three trials. If the flame is lost three times and does not successfully satisfy a call for heat, the R7184 locks out.

Pump Priming Cycle

T o facilitate purging air from the oil lines and filters, the R7184 can be placed in a purge routine by pressing and releasing the reset button during the safety check, delayed valve-on , ignition or carry-over periods. The

lockout timing will be extended to 4 minutes and the ignition set in the intermittent mode for this cycle only. The R7184 automatically reverts to its labeled interrupted and safety switch timing states. The pump primin g cycle can only be entered if there have been no lockout occurrences since the last successful heat call. To reset the device so that the pump priming cycle can be entered, press and hold the reset button for 30 seconds until the LED flashes twice.

Disable Function

Pressing and holding the reset button will disabl e all functions until the button is released. The R7184 will restart at the beginning of the normal heat cycle on safety check.

Limited Reset (Restricted Mode)

In order to limit the accumulation of unburned oi l in the combustion area, the control can only be reset three times. The reset count returns to zero each time a call for heat is successfully completed.

To reset from restricted mode: Press and hold the reset button for 30 seconds. When the LED flashes twice, the device has reset.

SPECIFICATIONS

Models:

Table 1 lists the major features and the applicable w iring diagram numbers for the R7184.

Timing:

Safe Start Check: 5 seconds (approximately). Valve-on Delay: 15 seconds. Burner motor-off Delay: 0, 2, 4, or 6 minutes, field-

selectable using DIP switch positions 1 and 2.

NOTE: For universal R7184U model, valve-on delay

and burner motor-off delay timings can be enabled (values as listed) or disabled (values are zero) in the field using DIP switch position 3.

Lockout: 15, 30 or 45 seconds (factory-programmed ). Recycle: 60 seconds (fixed). Ignition Carryover: 10 seconds (fixed).

69- 1233- 2

R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY

Electrical Ratings:

Inputs:

Voltage: 102 to 132 Vac, 120 Vac nominal. Current: 100 mA plus burner motor, valve and ignitor

loads.

Frequency: 60 Hz.

Outputs:

Relay Contacts: Burner: 120 Vac, 10 full load amperes (FLA),

60 locked rotor amperes (LRA). Valve: 120 Vac, 1A. Ignitor: 120 Vac, 360 VA. Alarm: 30 Vac, 2A. Thermostat Current Available: 100 mA.

Table 1. R7184 Models.

Model

R7184A None None None 3,4,5 Yes R7184B 15 None None 3,6,7

R7184P R7184U Selectable 0 or 15 Selectable 0 or

Some select models may have a delay enable/disable swit ch.

Standard timings. Other timing may be availa ble on select mo dels.

Select models are provided with a T-T jumper which can be disa bled by cutting with a pair of side-cutting pliers.

Valve-on delay

(sec)

Burner motor-off

delay (min)

0/2/4/6

0,2,4,6

NOTE: Reduce burner FLA rating by Ignitor load. For

example, if the ignitor draws 3A (120 Vac, 360 VA), reduce the burner motor FLA to 7A.

Environmental Ratings:

Operating Ambient Temperature: -40°F (-40°C) to

+147°F (+64°C). Shipping Temperature: -20°F (-29°C) to +150°F (+66°C). Humidity: 90% relative humidity at 95°F (9 3°C)

noncondensing.

Approvals:

Underwriters Laboratories Inc.: Recogni zed. Canadian Underwriters Laboratories Inc.

Alarm

Contacts

Optional 3,6,7 Yes Yes 3,6,7 Yes

Typical Wiring Diagram

Fig. Reference No.

Thermostat

Terminal s T- T

Yes

INSTALLATION

When Installing this Product...

Read these instructions carefully. Failure to follow

instructions can damage product or cause a hazardous condition. Check ratings given in these instructions and on

product to make sure product is suitable for your application. Make sure installer is a trained, experienced

service technician. Use these instructions to check out product

operation after installation.

R7184S7184

BURNER

WARNING

Electrical Shock Hazard. Can cause serious injury or death.

Disconnect power supply before beginning installation to prevent electrical shock or equipment damage.

Location

Mount on a 4 in. by 4 in. junction box, directly on

the main burner or inside the appliance cabinet. In replacement applications, mount in the same location as the old control. See Fig. 1. Make sure the operating temperatures are within the ambient temperature range (see Specifications section). Before mounting the control, make line voltage

connections as shown in Fig. 2 through 7. Splice lines with solderless connectors. Do not exceed load ratings shown on the device label. If necessary, use the control as a template to mark

and drill new mounting holes. Mount using No. 6 screws (obtained locally).

69-1233—2 2

M17180A

Fig. 1. Mounting R7184 on junc tion box.

WIRING

Make sure wiring complies with all local codes and

ordinances. After mounting, make low voltage connections to

the screw terminals (see Fig. 2 through 7). Strip leads 3/8 in. (10 mm) and insert under

terminal screw. See Fig. 1. Connect thermostat leads to T-T.

Switch Settings

Figure 8 and Table 2 provide the switch settings for the R7184U.

R7184A,B,P,U IN TE RRUPTED ELECTRONIC OIL PRIMARY

CHECKOUT

Start System

WARNING

Fire Hazard. Can cause serious injury or death.

Make sure combustion chamber is free of oil and/or oil vapor before starting system.

INTERRUPTED

IGNITOR

INTERMITTENT

BURNER MOTOR

LIMIT VALVE

Fig. 2. Wiring terminals.

Open hand valve in oil supply line.

Make sure system is powered. Check circuit

breaker or fuse and close system switch, if provided. Set thermostat to call for heat.

Make sure burner lights and operates until call for

heat ends.

Check Safety Features

Safe Start

Place a jumper across cad cell terminals.

Follow procedure to turn on burner. Burner must

not start, indicator light turns on and control remains in Idle Mode.

Simulate flame failure:

Follow procedure to turn on burner.

Close hand valve in oil supply line.

Device enters recycle mode.

Device tries to restart system after approximately

60 seconds. Safety switch locks out approximately in safety

switch timing indicated on label. Indicator light flashes at 1 Hz rate. Ignition and motor stop and oil valve closes.

CAD CELL

M16453A

THERMOSTAT

TO REMOTE ALARM CIRCUIT

LEGEND:

CIRCULATION PUMP

R7184

LIMIT

T T

JUMPER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

OPTIONAL FEATURE ON SELECT MODELS.

BURNER MOTOR

INTERRUPTED

IGNITOR

INTERMITTENT

VALVE

CAD

ALARM

CELL

SCREW TERMINAL

L8148A,C

AQUASTAT® CONTROLLER

JUNCTION BOX

B2 B1

T T

BURNER MOTOR

IGNITOR

VALVE

CAD CELL

1/4 IN. QUICK CONNECT TERMINAL

M17182B

Fig. 3. Wiring for typical oil-fired bo il er.

HOT

L1 (HOT)

M17183B

T8600

G Y R W

TO REMOTE ALARM

CIRCUIT

LEGEND:

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

OPTIONAL FEATURE ON SELECT MODELS. VALVE MAY BE ADDED AS SHOWN.

Fig. 4. Typical wiring diagram for 24 Vac thermostat

and R7184 for an oil-fired forced air system.

FAN RELAY

R7184

BURNER MOTOR

INTERRUPTED IGNITOR INTERMITTENT

CAD CELL

ALARM

SCREW TERMINAL

COOLING CONTROL

LIMIT

VALVE

BURNER MOTOR

IGNITOR

CAD CELL

JUNCTION BOX

1/4 IN. QUICK CONNECT TERMINAL

L1 L2

3 69-1233—2

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