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

Page: 53 / 82

SECTION 10: W
IRING
47 of 71
10.5.3 Analo g Si g nal Modulatin g Thermostat (P/N
90425105)
A programmable, 7-day programming, mod u lating
thermostat can be installed to s u pply an analog (4-
20mA) or (2-10Vdc w ith 500 Ohm resistor) control
signal to dictate the heater(s) firing rate. The
thermostat shall energize the T24 and T25 (R and
W) terminals. For thermostat
w iring, See Page 51,
Figure 28 and Page 52, Figure 29 . Optional room
sensors (P/N 10081520) and o u tdoor air sensors
(P/N 10081521) are a v ailable.
Room temperat u re a v eraging net w orks can be
created w ith u p to nine room sensors (P/N
10081520). Refer to thermostat installation
instr
u ctions for w iring.
10.5.4 Analo g Si g nal Modulatin g Thermostat with
LonWorks ® Communication (P/N 90425104)
If LonWorks ® comm u nication is req u ired, a
mod u lating thermostat can be installed to s u pply an
analog (4-20mA or 2-10Vdc) signal to control the
heater(s) firing rate. For thermostat
w iring, See Page
51, Figure 28 and Page 52, Figure 29 . Optional room
sensors (P/N 10081520) and o u tdoor air sensors
(P/N 10081521) are a v ailable for this thermostat, as
w ell.
The mod u lating thermostat w ith LonWorks ® pro v ides
net w orking capability in a LonWorks
®
system.
Comm u nications port r u nning at 78 kilobits per
second (kbs), this thermostat can be config u red to
perform a v ariety of acti v ities in w hich data is sent or
recei v ed on the LonWorks ® . Information that can be
shared, v ie w ed and modified w ith net w ork incl u des:
• C u rrent year, month, day, ho u r, min u te, second.
• System Mode.
• Space Temperat
u re
• O u tdoor air temperat u re
• C u rrent setpoint
• Occ u pied/Unocc u pied sched u le commands.
• Space Temperat u re
10.5.5 Analo g si g nal Modulatin g with BACnet ®
Pro g rammable Thermostat (P/N 90425109).
If BACnet
®
comm u nication is req u ired, a BACnet
®
enabled mod u lating thermostat can be installed to
s u pply an analog o u tp u t (0-10VDC) signal control to
dictate the heater(s) firing rate. For thermostat w iring,
See Page 53, Figure 30
.
This thermostat is a flexible w all-mo u nted stand-
alone control w ith combined controller/sensor.
Temperat u re sensing is standard w ith optional
h u midity and motion sensing. BACnet ® connections
allo w integral peer to peer BACnet
®
MS/TP LAN
net w ork comm u nications w ith config u rable ba u d
rates and can easily integrate w ith a b u ilding
a u tomation system.
MS/TP Wirin g
Connect the -A terminal in parallel w ith all other -A
terminals on the net w ork and the +B terminal in
parallel w ith other +B terminals.
10.5.6 Se q uence of Operation for Modulatin g
Thermostats
The thermostat w ill control the heater(s) firing rate
based on the demand signal comm u nicated from
thermostat program taking into acco u nt space
temperat u re. The thermostat w ill energize T25 (W)
terminal. At high heat, a demand signal w ill t u rn the
heater(s) on at maxim u m heater(s) firing rate. Once
the room temperat u re gets close to the thermostat
set point, then the thermostat program w ill slo w the
heater(s) firing rate do w n u ntil the room temperat u re
reaches the thermostat set point.