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RM7838C1012
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Honeywell RM7838B1021, RM7838B2021, RM7838C1012, RM7838C2012 Installation Instructions Manual

RM7838B, RM7838C 7800 SERIES Relay Modules
INSTALLATION INSTRUCTIONS

APPLICATION

Functions provided by the RM7838B,C include automatic modulated High Fire and Low Fire proven Purge, then the sequence stops, waiting for a Start Switch input, flame supervision, system status indication, system or self­diagnostics and troubleshooting.
The RM7838C differs from the RM7838B as follows:
1. Alarms only on Safety Shutdown.
2. Has 15-second MFEP.
3. Requires ST7800C Purge Timer.
This document covers the following 7800 Series Relay Modules:
RM7838B1021 RM7838B2021 RM7838C1012 RM7838C2012
This document provides installation and static checkout instructions. Other applicable publications are:
Form Number Description
32-00110 S7800A2142 4-line LCD Keyboard
32-00166 204729A/C KDM NEMA4 Covers for
65-0084 Q7800A,B 22-Terminal Wiring
65-0089 ST7800A,C Plug-In Purge Timer
65-0288 S7800A1142 Keyboard Display
65-0091 S7810A Data ControlBus Module™
65-0095 S7820 Remote Reset Module Product
65-0097 221729 Dust Cover Installation
65-0101 S7830 Expanded Annunciator Product
3
2-00235
65-0131 221818A Extension Cable Assembly
65-0229 7800 Series Relay Modules Checkout
65-0295 50023821-001/2 NEMA4 Covers for
Display Module Product Data
4-line LCD KDM
Subbase Product Data.
Installation Instructions.
Module Product Data.
Product Data.
Data.
Instructions.
Data.
R7824, R7847, R7848, R7849, R7861, R7862, R7886 Flame Amplifiers for the 7800 Series Product Data.
Product Data.
and Troubleshooting Product Data.
2-line Keyboard Display Module

Contents

APPLICATION................................................................................ 1
SPECIFICATIONS......................................................................... 2
INSTALLATION ................................................................................... 2
FINAL WIRING CHECK .............................................................. 7
STATIC CHECKOUT............................................................................ 8
V
ALVE PROVING SYSTEM ................................................................ 11
P
RINCIPAL TECHNICAL FEATURES ................................................ 17
PERATION........................................................................................ 19
O S
ETTINGS AND ADJUSTMENTS ....................................................... 21
T
ROUBLESHOOTING ......................................................................... 22
SAFETY AND SECURITY............................................................ 27
SIL
Capable
3
32-00211-01
RM7838B, RM7838C 7800 SERIES RELAY MODULES
WARNING
MV1
MV2
VP
SW.
M22660B
OUTLET
INLET
1
CAUTION: VALVE ENERGIZING TIMING IS BASED ON VALVE OPENING TIMES OF 13 SECONDS MAXIMUM.
− FOR VALVES WITH TIMINGS GREATER THAN 13 SECONDS - A BYPASS SOLENOID (RATED AS A SAFETY SHUTOFF VALVE) VALVE (1/4”, 120 VAC) IS REQUIRED TO OBTAIN THE PROPER TEST PRESSURES.
− THE BYPASS VALVE WILL BE WIRED IN PARALLEL TO THE VALVE IT IS BYPASSING (TERMINAL 9 FOR MV1 OR TERMINAL 17 FOR MV2).
1
The RM7838B1021 and RM7838C1012 Relay Modules offer VPS, thus they differ in the following manner from the RM7838B1013 and RM7838C1004:
1. Terminal 16 changes from Pilot Valve Hold Input to Valve Proving Switch Input.
2. Terminal 17 changes from Manual Valve Open Input to Main Valve 2 Output.
3. JR3-Deferred or Immediate Function is replaced with Fan On for VPS.
4. Blinkum fault annunciation on safety shutdown (power LED blinks a fault code).
5. Built-in features set up only using the S7800A1142 Keyboard Display Module. a. Valve Proving System. b. Programmable Postpurge.
At commissioning time, the Valve Proving System may be scheduled to occur at one of five different times:
• Never—Device default as received—Valve proving does not occur.
• Before—Before Start input; concurrent with Prepurge.
• After—Valve proving occurs after the Run state, (Stop Switch pushed) before the device goes to Standby. (Concurrent with Postpurge, if selected.)
• Both—Valve proving occurs at both times Before and After, noted above.
• Split—The main valve 1 (MV1) (high pressure) seat test is performed at the Before time and the main valve 2 (MV2) (low pressure) seat test is performed during the After time.
The following assumptions apply when using the RM7838B1021 or RM7838C1012 Valve Proving testing:
Fig. 1. The valve proving system.
MV1— Wired to terminal 9. It is located in the most upstream position of the main gas valve train.
VPS—Valve Proving Switch: Setpoint at 1/2 of Main Valve inlet pressure.
MV2—Wired to terminal 17. It is the main valve located closest to the burner.
The Proof of Closure Switch (PII—Pre-Ignition Interlock) for terminal 20 can be installed on MV1, MV2, or both valves.
Explosion Hazard. Can cause severe injury, death or property damage.
Leaking gas valves can result in fire or explosion. The Valve Proving System is designed to detect such leaks. A valve proving test time that is too short may allow unacceptable leaks to go undetected. Use the procedure in Appendix A to select sufficient valve test times to detect any unacceptable leak.

SPECIFICATIONS

Electrical Ratings (See Table 4):
Voltage and Frequency: 120 Vac (+10/-15%),
50/60 Hz (±10%).
Power Dissipation:
RM7838B,C: 10W maximum. Maximum Total Connected Load: 2000 VA. Fusing Total Connected Load: 15A maximum, fast blow
type SC or equivalent.
Environmental Ratings:
Ambient Temperature:
Operating: -40°F to 140°F (-40°C to 60°C). Storage: -40°F to 150°F (-40°C to +66°C).
Humidity: 85% relative humidity continuous, noncon-
densing.
Vibration: 0.5G environment.
SIL 3 Capable:
SIL 3 Capable in a properly designed Safety Instrumented
System. See form number 65-0312-04 for Certificate Agreement.
Approvals:
Underwriters Laboratories Inc. Listed: File No. MP268, Vol.
30. UL 37260730-2-5 / CSA C22.2 No. 60730-2-5. Factory Mutual Approved: Report No. 1V9A0.AF. Swiss Re (formerly Industrial Risk Insurers): Acceptable. Federal Communications Commission: Part 15, Class B,
Emissions. Exida: IEC 61508:2010 Parts 1-7, SIL 3 capable. Control Safety Devices: Acceptable CSD-1 EAC Russia
IMPORTANT
A Flame Detection System is required for operation and must be ordered separately. Select the applicable Flame Signal Amplifier and matching Flame Detector in form 65-0109.
32-00211—01 2

INSTALLATION

WARNING
WARNING

When Installing this Product...

1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and marked on the product to make sure the product is suitable for the application.
3. Installer must be a trained, experienced, flame safeguard service technician.
4. After installation is complete, check out the product operation as provided in these instructions.
Explosion or Fire Hazard. Can cause severe injury, death or property damage.
To prevent possible hazardous burner operation, verify safety requirements each time a control is installed on a burner.
RM7838B, RM7838C 7800 SERIES RELAY MODULES
9. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, can cause interference with radio communications. It has been tested and found to comply with the limits for a Class B computing device of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when operated in a commercial environment. Operation of this equipment in a residential area can cause interference; in which case, the users, at their own expense, may be required to take whatever measures are required to correct this interference.
10. This digital apparatus does not exceed the Class B limits for radio noise for digital apparatus set out in the Radio Interference Regulations of the Cana­dian Department of Communications.
See Fig. 3 for the internal block diagram of the RM7838B,C Relay Module.

Location

Electrical Shock Hazard. Can cause severe injury, death or equipment damage.
Disconnect the power supply before beginning installation. More than one power supply disconnect can be required.
IMPORTANT
1. Wiring connections for the relay modules are unique; refer to Fig. 4 or the appropriate Specifica­tions for proper subbase wiring.
2. Wiring must comply with all applicable codes, ordinances and regulations.
3. Wiring must comply with NEC Class 1 (Line Voltage) wiring.
4. Loads connected to the RM7838B,C must not exceed those listed on the RM7838B,C label or the Specifications; see Table 4.
5. Limits and interlocks must be rated to simultane­ously carry and break current to the ignition trans­former, pilot valve, and main fuel valve(s).
6. All external timers must be listed or component recognized by authorities who have proper jurisdiction.
7. For on-off gas-fired systems, some authorities who have jurisdiction prohibit the wiring of any limit or operating contacts in series between the flame safeguard control and the main fuel valve(s).
8. Two Flame Detectors can be connected in parallel with the exception of Infrared Flame Detectors (C7015, C7915) Ultraviolet Flame Detectors (C7927, C7961), and Visible Light Detector (C7962).
Humidity
Install the relay module where the relative humidity never reaches the saturation point. The relay module is designed to operate in a maximum 85% relative humidity continuous, noncondensing, moisture environment. Condensing moisture can cause a safety shutdown.
Vibration
Do not install the relay module where it can be subjected to vibration in excess of 0.5G continuous maximum vibration.
Weather
The relay module is not designed to be weather tight. When installed outdoors, protect the relay module in an approved weather-tight enclosure.

Mounting Wiring Subbase

1. Mount the subbase in any position except
horizontally with the bifurcated contacts pointing down. The standard vertical position is recommended.
2. Select a location on a wall, burner or electrical panel. The Q7800 can be mounted directly in the control cabinet; be sure to allow adequate clearance for service, installation, access or removal of the RM7838B,C, Expanded Annunciator, KDM, flame amplifier, flame amplifier signal voltage probes, Run/Test Switch, electrical signal voltage probes and electrical field connections.
3. For surface mounting, use the back of the subbase as a template to mark the four screw locations, then drill the pilot holes.
4. Securely mount the subbase using four no. 6 screws.
3 32-00211—01
RM7838B, RM7838C 7800 SERIES RELAY MODULES
WARNING

Relay Module and Subbase Compatiblity

NOTE: There are several different subbase models that
can be purchased. It is important to note which subbase is compatible with the relay module when purchasing new, repair or replacement parts.
Series 1000 Relay Modules
All relay product codes that start with a 1 (example: RM7840G1 Q7800A1003/U and Q7800A1005/U.
Series 2000 Relay Modules
All relay product codes that start with a 2 (example: RM7840G2 Q7800A2003/U and Q7800A2005/U.
Subbase Compatibility
Any Relay Module in the 1000 Series with a Software Revision level number starting with a "5" or greater will be compatible with all subbase models both installed and newly purchased. This includes (Q7800A1005/U, Q7800B1003/U), and the 2000 Series subbases (Q7800A2005/U, Q7800B2003/U).
See Fig. 2 for Software Revision Level number location on the label (located on the rear of the relay module).
014/U) can be used with existing subbase
014/U) must be used with subbase
Any relay module in the new 2000 series will only be able to be installed on subbase Q7800A2005/U, Q7800B2003/U and will not be backward compatible with any Q7800A1003/U and Q7800A1005/U subbases already installed in the field.
Fig. 2. Software revision location.
IMPORTANT
Make sure to check the relay model number and the software revision level on the relay.
• If you attempt to place a 2000 series relay on a non­compatible 1000 series subbase, you will receive an error code of 101. This indicates that you must a) change out the subbase to a Q7800A2003/U or Q7800A2005/U or b) choose a compatible 1000 series relay module.

Wiring Subbase

Electrical Shock Hazard. Can cause serious personal injury, death or equipment damage.
Disconnect the power supply before beginning installation. More than one power supply disconnect may be required.
Application Recommended Wire Size Recommended Part Numbers
Line voltage terminals
KDM
Data ControlBus Module™
Remote Reset Module
13 Vdc full wave rectified transformer power input.
1. Refer to Fig. 4 for proper subbase wiring.
2. For proper remote wiring of the KDM, refer to the
KDM Specifications (65-0288), Data ControlBus Module™ (65-0091) or Extension Cable Assembly (65-0131).
3. Make sure all wiring complies with all applicable electrical codes, ordinances and regulations. Wiring, where required, must comply with NEC, Class 1 (Line Voltage) wiring.
4. See Table 1 for recommended wire size and type.
Table 1. Recommended Wire Sizes and Part Numbers.
14, 16 or 18 AWG (0.75, 1.5 or 2.5 mm2) copper conductor, 600 volt insulation, moisture-resistant wire.
2
22 AWG (0.34 mm ground, or five-wire.
22 AWG (0.34 mm2) two-wire twisted pair with ground, or five-wire.
22 AWG (0.34 mm2) two-wire twisted pair, insulated for low voltage.
18 AWG (0.75 mm temperatures for given application.
) two-wire twisted pair with
2
) wire insulated for voltages and
TTW60C, THW75C, THHN90C.
Belden 8723 shielded cable or equivalent.
Belden 8723 shielded cable or equivalent.
—
TTW60C, THW75C, THHN90C.
The KDM or Data ControlBus Module™ (for remote mounting or communications) must be wired in a daisy chain configuration,
32-00211—01 4
1(a)-1(a), 2(b)-2(b), 3(c)-3(c). The order of interconnection of all the devices listed above is not important. Be aware that modules on the closest and farthest end of the daisy
RM7838B, RM7838C 7800 SERIES RELAY MODULES
chain configuration string require a 120 ohm (1/4 watt minimum) resistor termination across terminals 1 and 2 of the electrical connectors, for connections over 100 feet (31 meters).
5. See Table 2 for recommended grounding practices.
6. Use recommended wire routing of leadwires:
a. Do not run high voltage ignition transformer
wires in the same conduit with the flame detector, Data ControlBus Module™, or Remote Reset Module wiring.
b. Do not route flame detector, Data ControlBus
Module™, or Remote Reset Module leadwires in conduit with line voltage circuits.
c. Enclose flame detector leadwires without armor
cable in metal cable or conduit.
7. Follow directions in flame detector, Data ControlBus Module™, or Remote Reset Module Instructions.KDM: Because the KDM is powered from a low voltage, energy limited source, mount it outside of a control panel if it can be protected from mechanical damage.
Table 2. Recommended Grounding Practices.
Ground Type Recommended Practice
Earth Ground (Subbase and relay module)
1. Use to provide a connection between the subbase and the control panel of the equipment. Earth ground must be capable of conducting enough current to blow the 15A fast blow, type SC or equivalent, fuse (or breaker) in the event of an internal short circuit.
2. Use wide straps or brackets to provide minimum length, maximum surface area ground conductors. If a lead wire must be used, use 14 AWG copper wire.
3. Make sure that mechanically-tightened joints along the ground path are free of nonconductive coatings and protected against corrosion on mating surfaces.
Signal Ground (KDM, Data ControlBus Module™).
Use the shield of the signal wire to ground the device to the signal ground terminal 3(c) of each device. Connect the shield at both ends of the daisy chain to earth ground.
NOTE: Use a separate 13 Vdc power supply any time
more than two Data ControlBus Modules™ or KDM are used or are placed more than 100 feet (31 meters) from the relay module.
8. Use maximum wire lengths: a. RM7838B,C leadwires—300 feet (91 meters) to
terminal inputs (Control, Preignition Interlock, Running/Lockout Interlock, High Purge Switch and Low Fire Switch).
b. Flame Detector leadwires—limited by the flame
signal strength.
c. Remote Reset leadwires—1000 feet (305 meters)
to a Remote Reset push button.
d. Data ControlBus Module™—depends on the
number of system modules connected, the noise conditions and the cable used. The maximum length of all Data ControlBus Module™ interconnecting wire is 4000 feet (1219 meters).
9. Make sure loads do not exceed the terminal ratings. Refer to the label on the RM7838B,C or to the ratings in Table 4.
5 32-00211—01
RM7838B, RM7838C 7800 SERIES RELAY MODULES
CONFIGURATION JUMPERS
MICROCOMPUTER
RESET PUSHBUTTON
RUN/TEST SWITCH
STATUS LED
PLUG-IN PURGE TIMER CARD
SAFETY RELAY CIRCUIT
POWER SUPPLY
KEYBOARD DISPLAY MODULE
HIGH PURGE
COMMON
MODULATE
LOW FIRE
PLUG-IN FLAME AMPLIFIER
RELAY DRIVE CIRCUIT
CONTROL POWER
TEST JACK
REMOTE RESET
DDL
DDL COMMUNICATIONS
INDICATES FEEDBACK SENSING OF RELAY CONTACT STATUS AND LINE VOLT INPUTS
FIELD WIRING INTERNAL WIRING
IGNITION
PILOT
MAIN VALVE 1
1K
RELAY STATUS FEEDBACK AND LINE VOLTAGE INPUTS
LIMITS
PREIGNITION INTERLOCK
1K1 2K1 5K1
8K1
8K2
9K1
9K2
120 Vac
50/60 HZ
FLAME SIGNAL
TEST
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
AN ALARM SILENCING SWITCH MAY BE NEEDED FOR RM7838B.
RS485
1
2
3
L1 (HOT) L2
4
6
7
4K1
2K2
10
8
9
7K
5K
4K
3K
2K
F
G
22
1
6K1
5
ALARM
3K1
3
L2
12
13
15
14
M22661B
2
1
RECIRCULATING BLOWER
STOP SWITCH
RECIRCULATING AFS
COMBUSTION AIR BLOWER
16
18
19
20
21
LOCKOUT INTERLOCKS AND COMBUSTION AIR BLOWER SWITCHES
VALVE PROVING SWITCH
LOW START SWITCH
HIGH PURGE RATE SWITCH
START SWITCH
BURNER CONTROL
MAIN VALVE 2
7K
17
2
32-00211—01 6
Fig. 3. Internal block diagram of RM7838B,C.
RM7838B, RM7838C 7800 SERIES RELAY MODULES
M32334
G
L2
3
5
6
7
8
9
10
11
4
(L1)
13
14
17
18
19
20
21
22
12
16
15
LIMITS
MAIN FUEL VALVE 1
INTERMITTENT/ INTERRUPTED PILOT/IGNITION
120V, 50/60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION (15 AMP TYPE SC FUSE OR EQUIVALENT FAST BLOW FUSE) AS REQUIRED.
DO NOT CONNECT WIRES TO UNUSED TERMINALS.
SEE FLAME DETECTOR SPECIFICATIONS FOR CORRECT DETECTOR WIRING.
JR-2 CLIPPED INTERRUPTED PILOT RM7838B - 10 SECOND MFEP RM7838C - 15 SECOND MFEP.
ALARM SILENCING MAY BE NEEDED FOR RM7838B.
ALTERNATE WIRING FOR 4-20 MA SYSTEM.
LINE VOLTAGE ALARM
1
HIGH FIRE
COMMON
LOW FIRE
MODULATE
F
_
+
M7284 FIRING RATE MOTOR
+
4-20 mA OUTPUT CONTROLLER
VALVE PROVING SWITCH
MAIN FUEL VALVE 2
LOW FIRE START SWITCH
HIGH PURGE RATE SWITCH
PREIGNITION INTERLOCK (POC)
IGNITION
RECIRCULATING AIRFLOW SWITCH
COMBUSTION AIR FAN
2
3
4
3
4
2
5
5
_
FLAME DETECTOR
START
SWITCH
COMBUSTION AIRFLOW SWITCH
STOP
SWITCH
RECIRCULATING BLOWER
BURNER CONTROL
6
1
13
14
12
15
Q7800 SUBBASE
HIGH FIRE
COMMON
LOW FIRE
MODULATE
B
R
W
SERIES 90 FIRING RATE MOTOR
B
R
W
SERIES 90 CONTROLLER
6
7
7
ALTERNATE WIRING FOR SERIES 90 CONTROL CIRCUIT.
LOCKOUT INTERLOCK
L1
L2

FINAL WIRING CHECK

1. Check the power supply circuit. The voltage and
frequency tolerance must match those of the RM7838B,C. (A separate power supply circuit may be required for the RM7838B,C.)
2. Add the required disconnect means and overload protection.
3. Check all wiring circuits and complete the static checkout in Table 3 before installing the RM7838B,C
Fig. 4. Wiring subbase for RM7838B,C.
on the subbase.
4. Install the relay module.
5. Restore power to the panel.
7 32-00211—01
RM7838B, RM7838C 7800 SERIES RELAY MODULES
WARNING
CAUTION
WARNING

STATIC CHECKOUT

After checking all wiring, perform this checkout before installing the RM7838B,C on the subbase. These tests verify the Q7800 Wiring Subbase is wired correctly, and the external controllers, limits, interlocks, actuators, valves, transformers, motors and other devices are operating properly.
Explosion and Electrical Shock Hazards. Can cause serious injury, death or equipment damage.
Close all manual fuel shutoff valve(s) before starting these tests. Use extreme care while testing the system. Line voltage is present on most terminal connections when power is on.
Open the master switch before installing or removing a jumper on the subbase. Before continuing to the next test, be sure to remove test jumper(s) used in the previous test. Replace all limits and interlocks that are not operating properly. Do not bypass limits and interlocks.
Electrical Hazard. Can cause equipment damage.
Do not perform a dielectric test with the RM7838B,C installed. Internal surge protectors break down and conduct current, causing dielectric test failure and destruction of the internal lightning and high current protection.

Equipment Recommended

1. Voltmeter (1M ohm/volt minimum sensitivity) set on
the 0-300 Vac scale.
2. Two jumper wires; using No. 14 wire, insulated, 12 in. (304.8 mm) long with insulated alligator clips at both ends.
3. Ammeter can be used to verify loads (e.g. valves, ignition transformers) connected to the wiring sub­base.

General Instructions

1. Perform all applicable tests listed in the Static
Checkout, Table 3, in the order listed.
2. Make sure all manual fuel shutoff valves are closed.
3. Perform only those tests designated for the specific
RM7838B,C model being tested.
4. For each test, open the master switch and install the jumper wires between the subbase wiring terminals listed in the Test Jumpers column.
5. Close the master switch before observing operation.
6. Read the voltage between the subbase wiring termi-
nals listed in the Voltmeter column.
7. If there is no voltage or the operation is abnormal, check the circuits and external devices as described in the last column.
8. Check all wiring for correct connections, tight termi­nal screws, correct wire, and proper wiring tech­niques. Replace all damaged or incorrectly sized wires.
9. Replace faulty controllers, limits, interlocks, actua­tors, valves, transformers, motors and other devices, as required.
10. Make sure normal operation is obtained for each required test before continuing the checkout.
11. After completing each test, be sure to remove the test jumper(s).
Explosion Hazard. Can cause serious injury or death.
Make sure all manual fuel shutoff valves are closed.
Table 3. Static Checkout.
Tes t
No.
1 None 4-L2 Line voltage at terminal 4. 1. Master Switch.
2 None 6-L2 Close burner control.
2a None 4-20 Line voltage at terminal 20. Preignition Interlock.
2b None 4-16 Line voltage at terminal 16. Valve Proving Switch.
3 None 21-L2 With test 2 still running,
32-00211—01 8
Tes t
Jumpers Voltmeter Normal Operation If Operation is Abnormal, Check These Items
2. Power Connected to the Master Switch.
3. Overload protection (fuse, circuit breaker, etc) has not
opened the power line.
Recirculating exhaust blower fan starts, then line voltage at terminal 6.
press Start Switch. 120 Vac is present at terminal 21.
1. Recirculating/exhaust blower fan.
2. Limits.
3. Stop Switch.
4. Burner Control.
5. Recirculating AFS.
Start Switch.
RM7838B, RM7838C 7800 SERIES RELAY MODULES
CAUTION
Table 3. Static Checkout. (Continued)
Tes t
No.
4 None 6-L2 Push and hold Stop Switch.
5 4-3 None Alarm (if used) turns on. 1. Alarm.
6 4-5 7-L2 Close burner control.
7 4-8 None Automatic pilot valve opens.
8 4-9 None Automatic main fuel valves
9 4-10 None Ignition spark (if ignition
10 4-17 None Line voltage at terminal 17. 1. Listen for click or feel valve head for actuation of main
11 12-13 18-L2 Firing rate motor drives
12 12-13 19-L2 Firing rate motor reaches
13 13-14 19-L2 Firing rate motor leaves
14 13-14 18-L2 Firing rate motor drives to
15 13-15 None Adjust firing rate control
Final
Tes t
Jumpers Voltmeter Normal Operation If Operation is Abnormal, Check These Items
No voltage present at terminal 6.
Recirculating/exhaust blower fan starts, then line voltage is present at terminal 6.
1. Combustion air fan starts.
2. Line voltage at terminal 7 within 10 seconds.
First stage valve (DSI application only). Ignition spark (if ignition transformer connected).
open. (DSI checks optional second state fuel valve.)
transformer connected to terminal 10.
open; zero volts at terminal 18 after motor leaves Low Fire position.
High Purge Rate position; 120 Vac at terminal 19 when High Purge Rate Switch closes.
High Purge Rate Position; zero Vac at terminal 19 when High Purge Rate Switch opens.
Low Purge Rate position; 120 Vac at terminal 18 when switch closes.
and watch tracking action of the firing rate motor.
Stop Switch.
2. Alarm Silencing Switch.
1. Combustion air fan circuit: a. Manual switch on air fan motor. b. Air fan power supply, overload protection, and starter.
2. Combustion Blower Air Flow Switch.
3. Alarm Silencing Switch.
4. Recirculating Air Flow Switch.
1. Listen for click or feel head of valve for activation.
2. Watch for spark or listen for buzz: a. Ignition electrodes are clean. b. Ignition transformer is okay.
Listen for and observe operation of the main fuel valve(s) and actuator(s).
1. Watch for spark or listen for buzz: a. Ignition electrodes are clean. b. Ignition transformer is okay.
valve # 2.
1. Low Fire Start Switch.
2. Firing rate motor and transformer.
1. High Purge Rate Switch.
2. Firing rate motor and transformer.
1. High Purge Rate Switch.
2. Firing rate motor and transformer.
1. Low Purge Rate Switch.
2. Firing rate motor and transformer.
1. Firing rate control.
2. Firing rate motor and transformer.
Electrical Hazard. Can cause equipment damage.
After completing these tests, open the Master Switch and remove all test jumpers from the subbase terminals. Also remove bypass jumpers from the low fuel pressure limits if used.
9 32-00211—01
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