Manualshelf

Install Instructions

ManualsBrandsLochinvar ManualsBoilers745,000 BTU Copper-Fin Boiler (NG)
41424344454647484950
41
5 Electrical connections (continued)
Temperature adjustment
Note: The temperature controller is preset at the factory with
test settings. You may need to adjust the settings to meet your
specific needs.
Return water temperatures must not be less
than 140°F. If lower return water temperatures
are required, follow the instructions for Low
Temperature Return Water Systems on page
32.
⚠ WARNING
Locating the temperature control
The temperature control is located behind the panel on the left
front of the unit (see FIG. 5-9). Follow the steps below to access
the temperature control.
1. Loosen the knurled knob at the bottom of the control
panel cover.
2. Pull the bottom of the panel out and down to remove.
Temperature control settings
There are three setting knobs on the temperature control unless
your unit is specified as a boiler only with an outdoor air reset
option. If your unit is a boiler only with an outdoor air reset
option, there are additional controls for this option. They are
explained under Outdoor Air Reset Option, page 42.
The three setting knobs on the temperature control are for Set
Point, Differential, and High-Fire Offset (see FIG. 5-10).
Maximum set point
The maximum set point for the control is factory set. Boilers
are set to 230°F max., water heaters are set to 190°F max., and
specialty state and local codes to 200°F.
These maximum set points are established by not cutting/
cutting the OJ1 and OJ2 jumpers located on the right side of the
temperature controller (see FIG. 5-10). The maximum set point
is determined as shown in Table 5B.
Figure 5-9_Locating temperature control
TEMPERATURE
CONTROL
Figure 5-10_Temperature control setting knobs
VR3VR2VR1
CN8
CN7
CN9CN1
CN2
CN4
CN3
CN6
CN5
DIR #2000571961 00
Installation & Service Manual
Stage 1
1
2
3
4
5
6
7
8
9
10
+
+
+
+
+
+
+
+
+
+
SYSTEM/TANK
SENSOR
B2
B1
A2
A1
2NO
2C
1NO
1C
INTERMITTENT
LIMITS
CONTINUOUS
LIMITS
HIGH FIRE
ENABLE
LOW FIRE
ENABLE
9
8
7
6
4
3
2
1
10 5
Stage 2
Continuous
Alarms
1
2
3
4
5
6
7
8
9
10
+
+
+
+
+
+
+
+
+
+
SYSTEM/TANK
SENSOR
B2
B1
A2
A1
2NO
2C
1NO
1C
INTERMITTENT
LIMITS
CONTINUOUS
LIMITS
HIGH FIRE
ENABLE
LOW FIRE
ENABLE
9
8
7
6
4
3
2
1
10 5
Intermittent
Alarms
Figure 5-8_Field installation safety devices
Figure 5-7_Two-stage (high/low fire) boiler
1
2
3
4
5
6
7
8
+
+
+
+
+
+
+
+
SYSTEM/TANK
SENSOR
B2
B1
A2
A1
1NO
1C
INTERMITTENT
LIMITS
CONTINUOUS
LIMITS
ENABLE
9
8
7
6
4
3
2
1
10 5
Remote
on/off
Figure 5-6_Remote on/off water heater