Roberts Gorden Energytube EM-115, Nstallation, Operation And Service Manual

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NSTALLATION
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10.5.7 Cable Termination
Table lists w iring types, sizes and distances for
mod u lating thermostat w ith LonWorks
®
comm u nication (P/N 90425104), mod u lating
thermostat w itho u t comm u nication (P/N 90425105)
and BACnet ® programmable thermostat
(P/N 90425109)
Power Re q uirements
Mod u lating thermostats req u ire 24 v olts, AC po w er.
10.5. 8 Remote Analo g Si g nal
Remote Analog Signal 0-10 Vdc or 4-20mA o u tp u t
from external controller or B u ilding Management
System (BMS) directly dictates heater(s) firing rate.
An algorithm m
u st be programmed into the BMS or
external controller to recei v e zone air temperat u re
signals from its o w n temperat u re sensors and then
deli v er an o u tp u t signal to the heater(s) for the
desired firing rate.
For 0-10Vdc control of the heater(s) firing rate, the
follo
w ing control conditions apply:
ON/OFF relay at the external controller or BMS m u st
be w ired to R and W terminals on the heater control
board to t u rn the heater ON and OFF.
Minim u m rated inp u t at 1% of signal (0-1Vdc).
F u ll rated inp u t at 90% of signal (9Vdc).
Inp u t v aries linearly bet w een 1Vdc and 9Vdc.
Table 4:
Cable Re q uirements
Wire Function Recommended Wire Size
(Minimum)
Specification or
Re q uirement
Distance (Maximum)
Digital O u tp u ts 18 AWG (0.75 sq mm) Standard thermostat w ire 1000 ft (304 m)
Mod u lating O u tp u ts 18 AWG (0.75 sq mm) 1 pair 500 ft (152 m)
O u tdoor Air Temperat u re Sensor 18 AWG (0.75 sq mm) 1 pair 500 ft (152 m)
Remote Sensor 18 to 22 AWG
(0.75 to 0.34 sq mm) T w isted pair w ire 1000 ft (304 m)
Po w er Wiring 18 to 14 AWG
( 0.75to 2.0 sq mm) NEC Class II 140ºF (60°C ) Limited by line-loss effects on po w er
cons u mption.
LonWorks ® (P/N 90424104 only) 18 AWG
(0.75 sq mm) nonshielded
1 pair Refer to E-b u s Wiring G u ide 74-2865
for maxim u m length and generic cable
specifications.
MS/TP (P/N 90425109) 18 AWG (0.75 sq mm) Shield Belden cable #82760 or eq u i v alent Refer to Thermostat Installation G u ide