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XI. Electrical (continued)
2. 24VAC low voltage connections are located on
the left side of PCB-02. Three fuses and one
spare are provided.
3. 24VDC low voltage connections are located on
the right side of PCB-01 (see Figure 23). One
low voltage fuse and one spare is provided.
1. Connect 120 VAC power wiring to the line
D. Line voltage connections
voltage terminal strip in the control box.
2. Provide and install a fused disconnect or
service switch (12 AMP recommended) as
requried by the code.
2. To activate system or DWH pump wire as
shown in Figure 23.
1. Route all low voltage wires through the
E. Low voltage connections
junction box's knockouts in the rear of the
boiler.
4. If outdoor temperature sensor is used, connect
sensor to PCB-04, terminals 51 and 52. The
boiler will adjust the target supply water
temperature set point downwards as the
outdoor air temperature increases.
a. The sensor should belocated on the outside
of the structure in an area where it will
sense the average air temperature around
the building. Avoid placing this sensor in
areas where it may be covered with ice or
snow. Locations where the senor will pick
up direct radiation from the sun should also
be avoided.
b. Avoid placing the senor near potential
sources of electrical noise such as
transformers, power lines, and fluorescent
lighting. Wire the sensor to the boiler using
22 gauge or larger wire. As with the sensor,
the sensor wiring should be routed away
from sources of electrical noise. Where it
is impossible to avoid such noise sources,
wire the sensor using a 2 conductor, UL Type
CM, AWM Style 2092, 300 Volt 60 C shielded
Appliance must be electrically grounded as
required by National Electrical Code ANSI/
NFPA 70-latest edition.
47
WARNING
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