Honeywell 7800 Series Operating Instructions Manual page 3

10 This digital apparatus does not exceed the Class B limits for
radio noise for digital apparatus set out in the Radio Interfer-
ence Regulations of the Canadian Department of Communi-
cations.
3.2 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% 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 vibra-
tion 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.
3.3 Mounting Wiring subbase
1 Mount the subbase in any position except horizontally with the
bifurcated 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
Q7800 can be mounted directly in the control cabinet. Be sure
to allow adequate clearance for servicing, installation, access
or removal of the relay module, 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.
3.4 Wiring subbase
➔ There are several different subbase models that can be pur-
chased. It is important to note which subbase is compatible
with the relay module when purchasing repair or replacement
parts.
series 1000 subbase
All relay product codes that start with a 1 (example:
RM7840G1014/U) can be used with existing subbase Q7800A-
1005/U. These relays can also be used on the Series 2000
subbase noted below.
series 2000 subbase
All relay product codes that start with a 2 (example:
RM7840G2014/U) can be used with subbase Q7800A2005/U.
Adapter subbase Q7800F1004
The adapter subbase Q7800A1004 mounts directly on an existing
Q270 subbase without rewiring, of an RA890F/G Protectorelay®
primary controller that needs replaced by an EC/RM7890 relay
module. Refer to the specifications of the Q7800F Adapter Sub-
base (32-00261M), seewww.docuthek.com
subbase Compatibility
Any relay module in the 1000 series is fully backward compatible
with any subbase already installed in the field (Q7800A1005/U,
Q7800B1003/U, Q7800A2005/U, Q7800B2003/U).
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 Q7800A1005/U legacy
subbases already installed in the field.
IMPoRtAnt
Make sure to check the relay model number and check the
subbase compatibly prior to ordering or attempting a new
installation or field upgrade.
If you attempt to place a 2000 series relay on a non-compatible
1000 series subbase, you will receive an error code of 101.
This indicates that you must a) change out the subbase to a
Q7800A2005/U or b) choose a compatible 1000 series relay
module.
3.5 Wiring
WARnInG
Electrical Shock Hazard.
Can cause personal injury or equipment damage.
– Disconnect the power supply before beginning installation.
1 For proper subbase wiring and sequence chart, refer to page
8 (4.2.3 Fig. 2. Wiring subbase and operating sequence
chart for RM/EC7890).
2 For proper remote wiring of the KDM, refer to the Specifications
for the 2-line VDF KDM (65-0090), the 4-line LCD KDM
(32-00110), Data ControlBus Module™ (65-0091) or Extension
Cable Assembly (65-0131).
3 Disconnect the power supply from the main disconnect before
beginning installation to prevent electrical shock and equipment
damage. More than one disconnect can be required.
4 All wiring must comply with all applicable electrical codes,
ordinances and regulations. Wiring, where required, must
comply with NEC, Class 1 (Line Voltage) wiring.
5 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, KDM, 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.
d Follow directions in flame detector, KDM, Data ControlBus
Module™, or Remote Reset Module Instructions.
6 For KDM (KDM), because the KDM is powered from a low
voltage, energy limited source, it can be mounted outside of a
control panel if it is protected from mechanical damage.
➔ Use 13 Vdc power supply any time more than one KDM is
used.
7 Use maximum wire lengths:
a RM/EC7890 leadwires: The maximum leadwire length is
300 feet (91 meters) to terminal inputs (Control, Running/
Lockout Interlock).
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 (305 meters) to a Remote Reset pushbutton.
d Data ControlBus Module™: The maximum Data ControlBus
Module™ cable length depends on the number of system
modules connected, the noise conditions and the cable used.
The maximum length of all Data ControlBus Module™ inter-
connecting wire is 4000 feet (1219 meters).
8 For recommended wire size and type, see page 4 (3.5.1
Table 1: Recommended Wire Sizes and Part Numbers.).
9 The KDM, or Data ControlBus Module™ (for remote mounting)
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 over 100 feet (31 meters).
10 For recommended grounding practices, see page 4 (3.5.2
Table 2. Recommended Grounding Practices.).
11 Be sure loads do not exceed the terminal ratings. Refer to the
label on the RM/EC7890 or to the terminal ratings, see page
5 (3.5.3 Table 3. Terminal Ratings.).
EN-3