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XII. Electrical (continued)
2. Wire the Header Sensor to the terminals labeled
"Header Sensor" on the low voltage PCB.
a. Avoid placing the senor 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.
E. System and Circulation Pump Wiring
1. Do not exceed 5.6A total pump current draw
(system +DHW + boiler pumps). One 6.3A slow-
blow pump fuse and spare are provided.
a. The system pump can be wired to "System Pump"
on the 120 VAC PCB.
b. The primary pump can be wired to "Boiler Pump"
on the 120 VAC PCB.
AMP 400-1000L I&O Manual
OVERCURRENT
PROTECTION/DISCONNECT
BY INSTALLER
6.3A, SLOW BLOW
5mm X 20mm FUSE
* For indirect water heating with boiler models. Use
Primary Pump for direct water heating with water
heater models.
Figure 21: 120 VAC Connections PCB
WARNING
WARNING
Appliance must be electrically grounded as re-
quired 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.
HOT
NEUTRAL
GROUND
SYSTEM
PUMP
OPTIONAL
DOMESTIC HOT
WATER PUMP*
BOILER PUMP/
PRIMARY PUMP
AND
COMBUSTION
AIR DAMPER
(IF USING
ROOM AIR)
120 VAC/60 HZ
POWER SUPPLY
MAX. 5.6A
TOTAL PUMP
CURRENT DRAW
49
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