TT-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
98 of 198
2.
Pilot
- this indicator comes on
w
hen po
w
er is
present at terminals #8 and #10 of the flame
safeg
u
ard. It indicates that the pilot circ
u
it has
b
een t
u
rned on.
3.
Flame
- this indicates that a flame signal has
b
een pro
v
en.
4.
Main
- this indicator comes on after the flame
safeg
u
ard has pro
v
en o
u
t the flame signal. It
also sho
w
s that the main
v
al
v
es ha
v
e
b
een
acti
v
ated in the eq
u
ipment. On the safeg
u
ard
control, terminal #9 is po
w
ered
u
p.
5.
Alarm
- this indicates that a safety locko
u
t has
occ
u
rred,
w
hether
b
y loss of flame signal or
fail
u
re to ignite.
20.4.3.1 Honeywell RM7
8
97 Flame Safe
g
uard
Operation (ANSI, FM < 2.5MBH and XL < 1MBH)
The follo
w
ing
w
ill descri
b
e the internal operation of
the flame safeg
u
ard and the external f
u
nctions that
w
ill take place. We
w
ill j
u
st trace the
electromechanical steps and not the electronic
net
w
ork.
• Initiate
• The flame safeg
u
ard enters the INITIATE
seq
u
ence
w
hen the relay mod
u
le is initially
po
w
ered. The INITIATE seq
u
ence lasts for ten
seconds.
• Stand
b
y
• The flame safeg
u
ard is ready to start an operating
seq
u
ence
w
hen the operating control inp
u
t,
Terminal #6 recei
v
es po
w
er.
• Normal Start-Up Pre-p
u
rge
• The flame safeg
u
ard pro
v
ides PREPURGE
timing,
w
ith the ST7800 P
u
rge Timer card, for
se
v
en
w
ith po
w
er applied to Terminal #6.
• Ignition Trials
Pilot Flame Esta
b
lishing Period (PFEP):
A. When the PFEP
b
egins:
1. The pilot
v
al
v
e and ignition
transformer, terminals 8 and 10 are
energized.
2. Flame m
u
st
b
e pro
v
en
b
y the end
of the ten second PFEP to allo
w
the
seq
u
ence to contin
u
e. If a flame is not
pro
v
en
b
y the end of PFEP, a safety
sh
u
tdo
w
n occ
u
rs.
Main Flame Esta
b
lishing Period (MFEP):
After PFEP, and
w
ith the presence of flame,
the main f
u
el
v
al
v
e, terminal 9, is po
w
ered. If
a flameo
u
t occ
u
rs, the flame safeg
u
ard
recycles
w
ithin 0.8 or 3 seconds, depending
on the Flame Fail
u
re Response Time (FFRT)
of the amplifier.
• R
u
n
The flame safeg
u
ard is no
w
in RUN and remains
in RUN
u
ntil the controller inp
u
t, terminal 6,
opens, indicating that the demand is satisfied or a
limit has opened.
20.4.3.2 Honeywell RM7
8
97 Flame Safe
g
uard (FM
≥ 2.5MBH and XL ≥ 1MBH)
If the eq
u
ipment is ordered
w
ith a FM compliant
Manifold eq
u
al or o
v
er 2.5 M BTU or XL compliant
eq
u
al to or o
v
er 1 M BTU, certain seq
u
ences m
u
st
b
e
pro
v
ided in the flame safeg
u
ard control. The
safeg
u
ard control m
u
st
b
e con
v
erted to non recycle
on flame locko
u
t. This is accomplished
b
y config
u
ring
the on
b
oard j
u
mpers located on the
b
ack side of the
flame safeg
u
ard control.
FIGURE
8
5: Honeywell Safe
g
uard Jumpers
Table 39: Site-Confi
g
uration Honeywell
Safe
g
uard Jumpers
Jumpers
The relay mod
u
le has three site-config
u
ra
b
le j
u
mper
Jumper Number
7
8
97
JR1
Intact
JR2
Remo
v
e
JR3
Intact
JR1
JR2
JR3
Selectable Configuration Jumpers
Summary of Contents for TT Series
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Page 136: ...TT SERIES INSTALLATION OPERATION AND SERVICE MANUAL 130 of 198 FIGURE 114 Regulator RV61 ...
Page 167: ...SECTION27 TROUBLESHOOTING 161 of 198 ...
Page 175: ...SECTION27 TROUBLESHOOTING 169 of 198 ...
Page 177: ...SECTION27 TROUBLESHOOTING 171 of 198 ...
Page 198: ...TT SERIES INSTALLATION OPERATION AND SERVICE MANUAL 192 of 198 ...
Page 202: ...TT SERIES INSTALLATION OPERATION AND SERVICE MANUAL 196 of 198 ...
Page 203: ...SECTION 28 THE WEATHER RITE TT SERIES WARRANTY 197 of 198 ...
Page 204: ...TT SERIES INSTALLATION OPERATION AND SERVICE MANUAL 198 of 198 ...