Lochinvar 000 - 300 User Manual
Set Point
The Set Point knob specifies the target water temperature
in degrees, Fahrenheit. After the water temperature reaches
the set point, the temperature control shuts off the burners.
The Set Point knob specifies the target water temperature
in degrees, Fahrenheit. After the water temperature reaches
the set point, the temperature control shuts off the burners.
Differential
The Differential specifies the number of degrees below the
set point that the control will allow the water temperature
to drop before it brings the appliance back on again.
The Differential specifies the number of degrees below the
set point that the control will allow the water temperature
to drop before it brings the appliance back on again.
High-Fire Offset
The temperature control operates a two-stage firing system.
The two stages are High-Fire and Low-Fire. High-Fire
operates all burners while Low-Fire operates
approximately one-half of the burners.
The temperature control operates a two-stage firing system.
The two stages are High-Fire and Low-Fire. High-Fire
operates all burners while Low-Fire operates
approximately one-half of the burners.
The High-Fire knob specifies the number of degrees below
set point that the High-Fire stage shuts down. At that point,
the appliance will continue to operate at the Low-Fire stage
until the set point is reached.
set point that the High-Fire stage shuts down. At that point,
the appliance will continue to operate at the Low-Fire stage
until the set point is reached.
The High-Fire offset knob has settings between 0°F and
20°F. If set at 0°F, the High-Fire offset is disabled and the
appliance will operate at the High-Fire stage until the set
point is reached and the temperature control shuts the
appliance off.
20°F. If set at 0°F, the High-Fire offset is disabled and the
appliance will operate at the High-Fire stage until the set
point is reached and the temperature control shuts the
appliance off.
No matter what the High-Fire offset knob is set to, the
appliance will light at Low Fire and operate for
approximately 10 to 120 seconds before the High-Fire
stage actuates.
appliance will light at Low Fire and operate for
approximately 10 to 120 seconds before the High-Fire
stage actuates.
Outdoor Air Reset Option
For boilers ordered with the Outdoor Air Reset option,
there is an additional control (FIG. 6). There are three
setting knobs for Shutdown, Outdoor Air Max., and Ratio.
There is also a switch to turn the outdoor air shutdown
feature On or Off. An O.A. Sensor is also included.
there is an additional control (FIG. 6). There are three
setting knobs for Shutdown, Outdoor Air Max., and Ratio.
There is also a switch to turn the outdoor air shutdown
feature On or Off. An O.A. Sensor is also included.
FIG. 6 Optional Outdoor Air Reset Control
Shutdown
The Shutdown knob specifies the outdoor air lockout
temperature at which the control would prevent the
appliance from operating.
temperature at which the control would prevent the
appliance from operating.
Outdoor Air Max (O.A. Max)
The O.A. Max knob allows a reset up to the maximum
outdoor air temperature specified by this knob setting. At
any outdoor air temperature above the specified setting, the
appliance will not reset but will continue to run at the set
point temperature.
The O.A. Max knob allows a reset up to the maximum
outdoor air temperature specified by this knob setting. At
any outdoor air temperature above the specified setting, the
appliance will not reset but will continue to run at the set
point temperature.
Ratio
The Ratio knob allows control over the reset ratio to be
used during Outdoor Air Reset. The allowable ratios are as
low as 0.5:1 or as high as 1.5:1.
used during Outdoor Air Reset. The allowable ratios are as
low as 0.5:1 or as high as 1.5:1.
Selecting the 0.5:1 ratio will increase the set point 0.5°F for
every 1.0°F drop in outdoor air temperature up to the
maximum set point temperature.
every 1.0°F drop in outdoor air temperature up to the
maximum set point temperature.
Selecting the 1.5:1 ratio will increase the set point 1.5°F for
every 1.0°F drop in outdoor air temperature up to the
maximum set point temperature.
every 1.0°F drop in outdoor air temperature up to the
maximum set point temperature.
See Figure 7 for an outdoor air reset chart example.
FIG. 7 Outdoor Air Control Example Chart
Outdoor Air Shutdown Enable/Disable Switch
The Outdoor Air Shutdown Enable/Disable switch turns
the outdoor air shutdown feature On and Off. Disabling the
Outdoor Air Shutdown feature allows the appliance to
operate regardless of the outdoor air temperature. This is
needed for indirect domestic hot water systems for
example.
the outdoor air shutdown feature On and Off. Disabling the
Outdoor Air Shutdown feature allows the appliance to
operate regardless of the outdoor air temperature. This is
needed for indirect domestic hot water systems for
example.
7
OUTDOOR AIR RESET OPTION
R4R
4
R6R
6
R8R
8
R16R
1
6
R15R
1
5
C7C
7
C9C
9
C10C
1
0
VR2
VR2
VR3
VR3
OJ1
OJ1
OJ2
OJ2
D4D
4
J4J
4
CN1
CN1
CN2
CN2
CN9
CN9
CN7
CN7
CN8
CN8
CN3
CN3
CN4
CN4
CN5
CN5
CN6
CN6
W1
W1
TST2314
TST2314
20
20
15
15
10
10
5
5
(F-)0
(F-)0
15
15
14
14
13
13
12
12
11
11
10
9
9
8
8
7
7
6
6
5
5
OFF
OFF
120
120
240
240
220
220
200
200
160
160
140
140
SETPOINT
SETPOINT
DIFFERENTIAL
DIFFERENTIAL
HIGH-FIRE
HIGH-FIRE
OFFSET
OFFSET
(c)2002 L.C.
(c)2002 L.C.
SHUTDOWN
45
50
45
1.3
O.A. MAX.
70
40
VR1
65
RATIO
VR2
0.6
0.5
0.7
1.4
1.5
W1
W2
W3
60
50
70
40
55
60
VR3
65
DISABLE
O.A. SHUTDOWN
1.0
0.9
0.8
1.2
1.1
O.A. SENSOR
ENABLE
ON
SW1
55
CN1