Product Overview
Table Of Contents
- Application
- Features
- Optional Features
- Specifications
- Principal Technical Features
- Safety Provisions
- Internal Hardware Status Monitoring
- Closed Loop Logic Test
- Dynamic AMPLI-CHECKTM Circuitry
- Dynamic Input Check
- Dynamic Safety Relay Test
- Dynamic Self-Check Safety Circuit
- Expanded Safe-Start Check
- Off Cycle (Standby) Flame Signal Check
- Tamper Resistant Timing and Logic
- Verified Spark Termination
- First-Out Annunciation and Self- Diagnostics
- Interlock Requirements (RM7895 Only)
- Installation
- Wiring
- Assembly
- Operation
- Initiate
- Standby
- Static Checkout
- Checkout
- Equipment Recommended
- Checkout Summary
- Preliminary Inspection
- Flame Signal Measurement
- Initial Lightoff Check for Proved Pilot
- Initial Lightoff Check for Direct Spark Ignition (DSI)
- Pilot Turndown Test (All Installations Using a Pilot)
- Ignition Interference Test (All Flame Rods)
- To Eliminate Ignition Interference
- Flame Signal with Hot Combustion Chamber (All Installations)
- Safety Shutdown Tests (All Installations)
- Troubleshooting
RM7890; RM7895 100 VAC 7800 SERIES RELAY MODULES
66-1195—01 12
Fig. 6. Wiring the RM7895E,F Relay Module.
6. For recommended grounding practices, see Table 7.
Table 7. Recommended Grounding Practices.
7. Recommended wire routing:
a. For flame detector leadwires:
(1) Do not run high voltage ignition transformer
wires in the same conduit with the flame
detection wiring.
(2) Do not run scanner wires in a conduit with line
voltage circuits.
(3) Enclose scanner wires without armor cable in
metal cable or conduit.
(4) Follow directions given in the flame detector
instructions.
b. Data ControlBus™ or Modbus™ Module:
(1) Do not run high voltage ignition transformer
wires in the same conduit with, or in close
proximity to, the Data ControlBus Module wiring.
(2) Do not route Data ControlBus™ or Modbus Mod-
ule wires in conduit with line voltage circuits.
M32663
G
L2
3
5
6
7
8
9
10
F
(L1)
13
14
15
16
17
18
19
20
21
22
12
MASTER
SWITCH
IGNITION
MAIN FUEL
VALVE(S)
BURNER
CONTROLLER/LIMITS
BURNER MOTOR
(BLOWER)
INTERMITTENT
PILOT/IGNITION
RECTIFYING FLAME
ROD
100V, 50/60 Hz POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
FOR DIRECT SPARK IGNITION
(OIL OR GAS)
120V ALARM
L1
(HOT)
L2
1
8
10
IGNITION
TRANSFORMER
MAIN VALVE
1
Q7800
2
2
L2
4
AIRFLOW
INTERLOCK
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 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 tighted joints along the ground path are free
of nonconductive coatings and protected against corrosion on mating
surfaces.
Signal ground (KDM, Data ControlBus™
Module, Modbus™ Module
Connect the shield at both ends of the daisy chain to earth ground.