S
YSTEM
C
ONTROL
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
12
SECTION 5: TROUBLESHOOTING
5.1 Se
q
uence of Operation
a.
On demand for heat from the thermostat, the
panel
w
ill send po
w
er to the p
u
mp. The p
u
mp
w
ill begin operation.
b.
Once
v
ac
uu
m is established, the press
u
re
s
w
itch at the p
u
mp
w
ill close. If the
v
ac
uu
m is
not established
w
ithin 30 seconds the p
u
mp
w
ill go into locko
u
t (p
u
mp LED is flashing).
After one ho
u
r of locko
u
t, the system
w
ill re-
start.
c.
The System Control panel sends po
w
er to the
b
u
rners. The b
u
rners
w
ill go thro
u
gh a 45
second p
u
rge and cycle time.
d.
Once flame is established, the heater
w
ill
remain in operation
u
ntil s
u
ch time as either
the heating is t
u
rned off by the thermostat,
locko
u
t conditions occ
u
r, or after 24 ho
u
rs of
contin
u
o
u
s operation. After 24 ho
u
rs of con-
tin
u
o
u
s operation, the system control
w
ill sh
u
t
off and re-start to
v
erify no fa
u
lts exist in the
system.
e.
After the heating is t
u
rned off, the p
u
mp
w
ill
contin
u
e operation for 2 min
u
tes, post p
u
rge.
DANGER
Electrical Shock Hazard
Disconnect electric before service or
maintenance.
More than one disconnect switch may be
required to disconnect electric to the unit.
Failure to follow these instructions can result
in death or electrical shock.
WARNING
Explosion Hazard
Turn off gas supply to equipment before
service or maintenance.
Failure to follow these instructions can result
in death, injury or property damage.
Содержание System Control
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