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XIII. Electrical (continued)
C. Appliance Wiring
1. Connect to field wiring inside the control box. .
I I nside the control box are five printed circuit boards
(PCB's).
Table 36: AMP PCB's
Printed Circuit
Boards
PCB-01
PCB-02
PCB-03
PCB-04
PCB-05
PCB-06
2. 24VAC low voltage connections are located on
PCB-02. Three fuses and one spare are provided.
Three fuses and one spare are provided.
3. 24VDC low voltage connections are located on the
right side of PCB-01. One low voltage fuse and one
spare is provided.
4. Line voltage connections
a. Connect 120 VAC power wiring to the line voltage
terminal strip in the control box.
b. For 208 - 480 VAC, connect power wires to the
line voltage terminals in the junction box.
c. Provide and install a fused disconnect or service
switch as required by the code.
5. Low voltage connections
a. a. Route all low voltage wires through the junction
Route all low voltage wires through the junction
box's knockouts in the rear of the appliance.
box's knockouts in the rear of the appliance.
b. If applicable, wire the tank sensor, header
sensor, or outdoor temperature sensor to PCB-
4 terminals 51 and 52 as noted on the wiring
ladder diagram. See "Wire Diagram (continued)".
For indirect water heating use the DHW switch
location (terminals 53 and 54).
i.
The outdoor sensor should be located 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.
Functions/Connection
Line Voltage
Field Device
Extra Limits (optional)
Sensors
EMS
Communications
c. Avoid placing senors near potential sources of
electrical noise such as transformers, power lines,
and fluorescent lighting. Wire the sensor to the
appliance 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.
6. System and Circulation Pump Wiring
a. The system pump can be wired to Contact A on
PCB-02 as shown on the wire diagram.
b. The primary circulation pump can be wired
to Contact B on PCB-02 as shown on the wire
diagram.
c. For an isolation valve or indirect DHW pump, use
contact C.
!
Appliance must be electrically grounded as
required by National Electrical Code ANSI/NFPA
70-latest edition.
Caution: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation.
63
WARNING
WARNING
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