17
H
O
T
LI
M
I
T
CON
T
ROL
J
AC
K
E
T T
O
P P
ANEL
LO
W
ER
FRON
T
1/4"
SLO
T
J
AC
K
E
T P
ANEL
UPP
ER
FRON
T
J
AC
K
E
T P
ANEL
OIL
B
U
RNER
T
E
MP
ERA
TU
RE
P
RESS
U
RE
G
A
UG
E
W
IRE
H
ARNESS
B
U
RNER
W
IRE
H
ARNESS
CIRC
U
LA
T
OR
Figure 20
Boiler Controls
OPERATING INSTRUCTIONS
Sequence of Operation
• Thermostat calls for heat.
• Circulator turns on.
• Limit checks boiler water temperature. Burner ignition
delayed until limit determines call for heat cannot be met
by residual heat in boiler and heat distribution system.
A. See limit literature for additional information.
B. Burner delay by-passed for tankless heat call for
heat. Burner ignition begins immediately.
• Burner and circulator operation continues until
thermostat stops call for heat.
