SECTION 11: O
PERATION
AND
M
AINTENANCE
27 of 47
Fi
g
ure 15: Automatic Burner Control Se
q
uence
Fi
g
ure 16: Gas Valve for Models UHD[X][S] 75 – 125
Burner Se
q
uence for Ignition Control
Flame Signal
Start Gas Val
v
e
Ignition Spark
Thermostat 24 V
SHUT DO
WN
RU
N
START
ts = 10 Seconds
Signals Output By Control
Re
q
uired Incoming Signals
Flue Blower
Pressure
Switch
P
C
N
O
N
C
30 Seconds Purge*
*Purge time
b
egins at pressure switch change o
v
er.
30 Seconds Post
If at any stage the flame fails, the control
w
ill retry
for ignition. The control has fo
u
r trials for ignition
before a one ho
u
r locko
u
t.
½PSI
I
N
C
O
N
OFF
Regulator
Outlet
Pressure
Gas Inlet
Inlet Pressure
TOP VIEW
END VIEW
Description
Part Number
Gas
V
alve 75 – 125 NG
90032505
Gas
V
alve 75 – 125 LP
90032506
Содержание UHD 75
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Страница 29: ...SECTION 9 GAS PIPING 21 of 47 Figure 14 Gas Connection...
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