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
11 66-1195—01
Fig. 5. Wiring the RM7890 Relay Module.
Table 6. Recommended Wire Sizes and Part Numbers.
The KDM, and (for remote mounting or communications) Data
ControlBus™ Module or Modbus™ Module must be wired in a
daisy chain configuration,
(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 chain
configuration string require a 120 ohm (1/4 watt minimum)
resistor termination across terminals 1 and 2 of the electrical
connectors for connections longer than 100 feet (30 meters).
Application Recommended Wire Size Recommended Part Numbers
Line voltage terminals 14, 16 or 18 AWG copper conductor, 600
volt insulation, moisture-resistant wiring.
TTW60C, THW75C, THHN90C.
KDM 22 AWG two-wire twisted pair with ground,
or five-wire communications wire.
Belden
®
8723 shielded cable (two-wire) or
Belden
®
8771 shielded cable (five-wire) or
equivalent.
Data ControlBus™ Module 22 AWG two-wire twisted pair with ground
or five-wire communications wire.
Belden
®
8723 shielded cable (two-wire) or
Belden
®
8771 shielded cable (five-wire) or
equivalent.
Remote Reset Module 22 AWG two-wire twisted pair, insulated for
low voltage.
—
Modbus™ Module 22 AWG two-wire twisted pair with ground.
Belden
®
8723 shielded cable or equivalent.
13 Vdc full-wave rectified
transformer power input.
18 AWG wire insulated for voltages and
temperatures for given application.
TTW60C, THW75C, THHN90C.
M32662
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
120V ALARM
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)
L1
(HOT)
L2
1
8
9
10
IGNITION
TRANSFORMER
MAIN VALVE
1
Q7800
2
2
L2
4