182
RT-SVX24Q-EN
Figure 138.
Flue gas carbon dioxide and oxygen
measurements - same as Figure 51, p.73 in current
catalog.
Flue
Extension
Mounting
Bracket
Flue Tube
Vent Cap
Assembly
Heat Section
Vertical Support
Figure 139.
High/low pressure regulator
Full Modulating Gas Furnace
Full Modulating gas heaters are available for the 850,
1100, 1800, 2500 MBH heater sizes:
•
The firing rate of the 850 MBH modulating heater
can vary from 10% to 100% of the 850 MBH.
•
The firing rate of the 1100, 1800 and 2500 MBH can
vary from 5% to 100% of it's nameplate value.
Heat Exchanger
The heat exchanger drum, tubes and front and rear
headers are constructed from stainless steel alloys.
Unit Control
The unit is controlled by a supply air temperature
sensor located in the supply air stream for VAV units.
CV units have two sensors, one located in the supply
air stream and the zone sensor. The temperature
sensor signal is sent to the Heat module of the
IntelliPak Unit Control. The control signal from the Heat
Module signal is directly proportional to 0-10 VDC. The
higher the voltage signal, the lower the call for heat.
The 0-10 VDC signal controls the air damper actuator
which is mounted on the end of the air damper shaft.
As the actuator rotates clockwise, more combustion air
passes through the combustion air blower. In turn, the
gas butterfly valve opens more through a directly
connected linkage, resulting in a higher rate of firing.
1. Use tables in
to
program the following system components for
operation by scrolling through the Human Interface
displays :
G
Ga
ass H
He
ea
att
•
Supply Fan (On)
•
Variable Frequency Drive (100% Output, if
applicable)
•
RTM Occ/Unocc Output (Unoccupied)
•
High Fire (90%)
Turn the 115 volt control circuit switch located in
the heater control panel to the “On” position.
Open the manual gas valve, located in the gas heat
section.
2. Once the configuration for the appropriate heating
system is complete, press the NEXT key until the
LCD displays the “Start test in __Sec.” screen. Press
the + key to designate the delay before the test is to
start. This service test will begin after the TEST
START key is pressed and the delay designated in
this step has elapsed. Press the ENTER key to
confirm this choice.
3. Press the TEST START key to start the test.
Remember that the delay designated in step 2 must
elapse before the system will begin to operate.
W
WA
AR
RN
NIIN
NG
G
R
Ro
otta
attiin
ng
g C
Co
om
mp
po
on
ne
en
nttss!!
F
Fa
aiillu
urre
e tto
o d
diisscco
on
nn
ne
ecctt p
po
ow
we
err b
be
effo
orre
e sse
errv
viicciin
ng
g cco
ou
ulld
d
rre
essu
ulltt iin
n rro
otta
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ng
g cco
om
mp
po
on
ne
en
nttss ccu
uttttiin
ng
g a
an
nd
d sslla
assh
hiin
ng
g
tte
ecch
hn
niicciia
an
n w
wh
hiicch
h cco
ou
ulld
d rre
essu
ulltt iin
n d
de
ea
atth
h o
orr sse
erriio
ou
uss
iin
njju
urry
y..
D
Du
urriin
ng
g iin
nsstta
alllla
attiio
on
n,, tte
essttiin
ng
g,, sse
errv
viicciin
ng
g a
an
nd
d
ttrro
ou
ub
blle
essh
ho
oo
ottiin
ng
g o
off tth
hiiss p
prro
od
du
ucctt iitt m
ma
ay
y b
be
e
n
ne
ecce
essssa
arry
y tto
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wo
orrkk w
wiitth
h lliiv
ve
e a
an
nd
d e
ex
xp
po
osse
ed
d rro
otta
attiin
ng
g
cco
om
mp
po
on
ne
en
nttss.. H
Ha
av
ve
e a
a q
qu
ua
alliiffiie
ed
d o
orr lliicce
en
nsse
ed
d sse
errv
viicce
e
iin
nd
diiv
viid
du
ua
all w
wh
ho
o h
ha
ass b
be
ee
en
n p
prro
op
pe
errlly
y ttrra
aiin
ne
ed
d iin
n
h
ha
an
nd
dlliin
ng
g e
ex
xp
po
osse
ed
d rro
otta
attiin
ng
g cco
om
mp
po
on
ne
en
nttss,, p
pe
errffo
orrm
m
tth
he
esse
e tta
asskkss..
4. Once the system has started, check the appearance
of the flame through the sight glass provided on the
front of the heat exchanger. In appearance, a
normal flame has a clearly defined shape, and is
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