Mounting Wiring Subbase; Wiring Subbase - Honeywell R7140G Installation Instructions Manual

R7140G,L,M BURNER CONTROL MODULES
IMPORTANT
1. Wiring connections for the relay modules are unique;
therefore, refer to Fig. 4–11 or the correct
Specifications for proper subbase wiring, and
sequence charts.
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 R7140 must not exceed
those listed in the Specifications; see Table 3 and 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 jurisdiction for
the specific purpose for which they are used.
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 flame detectors C7015, C7927,
C7935, C7915, C7961, and C7962.
9. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used
in accordance with the instructions, may cause
interference to 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 may 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.
Location
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 percent relative humidity
continuous, noncondensing moisture environment.
Condensing moisture may cause a safety shutdown.
Vibration
Do not install the relay module where it could be subjected to
vibration in excess of 0.5G continuous maximum vibration.
Weather
The relay module is not designed to be weathertight.
When installed outdoors, protect the relay module using an
approved weathertight enclosure.
66-1153—2

Mounting Wiring Subbase

1. Mount the subbase in any position except horizontally
with the quadfurcated contacts pointing down. The
standard vertical position is recommended. Any other
position decreases the maximum ambient temperature
rating.
2. Select a location on a wall, burner, or electrical panel.
The Q520A can be mounted directly in the control
cabinet. Be sure to allow adequate clearance for
servicing, installation, access or removal of the R7140,
Expanded Annunciator, Keyboard Display Module,
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. Drill the pilot
holes.
4. Securely mount the subbase using four no. 6 screws.

Wiring Subbase

WARNING
Electrical Shock Hazard.
Can cause serious injury, death or equipment
damage.
Disconnect the power supply before beginning
installation to prevent electrical shock, equipment
and control damage. More than one power supply
disconnect may be required.
1. For proper subbase wiring, internal drawings, and
sequence check charts, refer to Fig. 5, 6, 7, 8, 9 and 11.
2. Disconnect the power supply from the main disconnect
before beginning installation to prevent electrical shock
and equipment damage. More than one disconnect may
be required.
3. All wiring must comply with all applicable electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC, Class 1 (Line Voltage)
wiring.
a. Follow recommended wire size and type.
b. Follow recommended grounding practices.
4. Recommended wire routing of leadwires:
a. Do not run high voltage ignition transformer wires in
the same conduit with the flame detector.
b. Do not route flame detector leadwires in conduit
with line voltage circuits.
c. Enclose flame detector leadwires without armor
cable in metal cable or conduit.
d. Follow directions in flame detector Instructions.
5. Maximum wire lengths follow:
a. R7140 leadwires—The maximum length of leadwire
is 300 feet to terminal inputs (Control, Pre-Ignition
Interlock, Running/Lockout Interlock, High Fire
Switch and Low Fire Switch).
b. Flame Detector leadwires—The maximum flame
sensor leadwire length is limited by the flame signal
strength.
c. Remote Reset leadwires—The maximum length of
wire is 1000 feet to a Remote Reset push button.
6. Make sure loads do not exceed the terminal ratings.
Refer to the label on the R7140 or to the ratings in Table
3 and 4.
6