Table 4: Cable Requirements - Roberts Gorden Energytube EM-115 Nstallation, Operation And Service Manual

EM-S I , O
ERIES NSTALLATION PERATION AND
10.5.7 Cable Termination
Table lists wiring types, sizes and distances for
modulating thermostat with LonWorks
communication (P/N 90425104), modulating
thermostat without communication (P/N 90425105)
and BACnet ® programmable thermostat
(P/N 90425109)
Table 4:
Cable Requirements
Wire Function
Digital Outputs
Modulating Outputs
Outdoor Air Temperature Sensor 18 AWG (0.75 sq mm)
Remote Sensor
Power Wiring
® (P/N 90424104 only) 18 AWG
LonWorks
MS/TP (P/N 90425109)
Power Requirements
Modulating thermostats require 24 volts, AC power.
10.5.8 Remote Analog Signal
Remote Analog Signal 0-10 Vdc or 4-20mA output
from external controller or Building Management
System (BMS) directly dictates heater(s) firing rate.
An algorithm must be programmed into the BMS or
external controller to receive zone air temperature
signals from its own temperature sensors and then
deliver an output signal to the heater(s) for the
desired firing rate.
For 0-10Vdc control of the heater(s) firing rate, the
following control conditions apply:
ON/OFF relay at the external controller or BMS must
be wired to R and W terminals on the heater control
board to turn the heater ON and OFF.
Minimum rated input at 1% of signal (0-1Vdc).
Full rated input at 90% of signal (9Vdc).
Input varies linearly between 1Vdc and 9Vdc.
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ERVICE ANUAL
®
Recommended Wire Size
(Minimum)
18 AWG (0.75 sq mm)
18 AWG (0.75 sq mm)
18 to 22 AWG
(0.75 to 0.34 sq mm)
18 to 14 AWG
( 0.75to 2.0 sq mm)
(0.75 sq mm) nonshielded
18 AWG (0.75 sq mm) Shield
Specification or
Requirement
Standard thermostat wire
1 pair
1 pair
Twisted pair wire
NEC Class II 140ºF (60°C )
1 pair
Belden cable #82760 or equivalent Refer to Thermostat Installation Guide
Distance (Maximum)
1000 ft (304 m)
500 ft (152 m)
500 ft (152 m)
1000 ft (304 m)
Limited by line-loss effects on power
consumption.
Refer to E-bus Wiring Guide 74-2865
for maximum length and generic cable
specifications.