7
SETTING THE CONTROL
NOTE: Settings can be checked using the
TEST/SETTINGS Button. See page 11 for details.
Setting the High Limit
The high limit is factory set at 190°F. To adjust, turn the HI
TEMP Dial
A
until the desired setting is displayed. (Setting
range: 100°-220°F)
Setting the Low Limit
The low limit is designed to maintain temperature in boilers
equipped with plate heat exchange used for domestic hot
water. The low limit is factory set to 170°. Prior to adjusting,
remove the jumper (not equipped on all units)
B
. Then turn
the LO TEMP Dial
C
clockwise until the desired temperature
is displayed. For proper operation, the low temperature limit
setting should be at least 10° below the high limit setting.
LL settings below 170°F should only be used in heat-only
boilers. For combi systems, cold start is set by adjusting
the boiler to the OP2 mode. Setting the LL under 170°F will
result in reduced or NO hot water. IMPORTANT: If low limit
temperature cannot be set above 140°F, remove jumper
B
.
(Setting range: OFF or 110°-200°F).
Setting the Economy Feature
The Economy Feature is factory set for a 1 zone heating
system. To adjust, turn the ECONOMY Dial
D
until the num-
ber displayed equals the number of heating zones. Do not
include indirect water heaters in the number of heating
zones. The Economy Feature conserves fuel by reducing
boiler temperature (see “How Thermal Targeting Works” on
page 8). If the heating system is unable to supply needed
heat to the house, the ECONOMY Dial should be turned to a
lower setting (example: In a three zone house, turn the dial to
2 or 1). Conversely, if the boiler provides adequate heat, add-
ed fuel savings can be achieved by selecting a higher setting
(example: 4 or 5).
Setting the Zone/Indirect Switch
The Zone/Indirect switch must be set to the “I” position.
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