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39
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
30.
ƽ WARNING
Locating the temperature control
The temperature control is located behind the panel on the left
front of the unit (see FIG. 5-6). 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 40.
The three setting knobs on the temperature control are for Set
Point, Differential, and High-Fire Offset (see FIG. 5-7).
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. 5-7). The maximum set point
is determined as shown in Table 5B.
Figure 5-6_Locating temperature control
TEMPERATURE
CONTROL
Figure 5-7_Temperature control setting knobs
SETPOINT
DIFFERENTIAL
HIGH-FIRE
OFFSET
OJ1
OJ2
OJ1
OJ2
TABLE 5B
Maximum Setpoint Determination
OJ1 OJ2
Max.
Setpoint
Connected Connected 230°
Cut Connected 190°
Connected Cut 200°
Cut Cut 160°
NOTICE
Anytime that OJ1 is the only jumper cut, a
new overlay is required under the Set Point
knob on the temperature controller because
the scale has changed to a maximum of
190°F.
Anytime the OJ2 jumper is cut (with or
without OJ1), a new overlay is required
under the Set Point knob on the temperature
controller because the scale has changed to
a maximum of 200°F.
Installation & Service Manual