Water Heater Application - Watts AERCO AM Series Quick Installation Manual

Quick Installation Guide
AM Series
Electrical/Controls Wiring - WATER HEATER

Install a 15 am fused disconnect or service switch. (15 amp). All electrical conduit and hardware should be installed so that it does not interfere with
the removal of any cover, inhibit service or maintenance, or prevent access between the unit and walls or another unit.

All AM Series pump relays are rated for 3A max. When pumps used exceed 3A, an appropriately sized external relay or starter must be used.
CONNECTING UNITS IN CASCADE:
Up to eight boilers or water heaters may be combined in a cascading system using
the optional Cascade Sequencer. Refer to the AERCO Cascade Sequencer user
manual (GF-146-CS) for installation details.
MODBUS INTERFACE CONNECTIONS:
The AM unit can be controlled from a building management system via MODBUS interface. This requires a Communication Module on each unit
(AM399-1000: factory installed; AM199/250: optional). Refer to the AM Series MODBUS User Manual (GF-146-MB) for wiring and setup details.
Controls Panel Button Functions
To access Installer Menu (Para 2000's):
Hold B and S (5 seconds) until G appears.
Scroll through parameters: R/S
Select parameter: B (value blinks)
Change parameter value: R/S
Confirm new value: B
Exit Installer Menu: Hold B (>5 seconds) until G disappears.
QIG-0001_0A •
To access Factory Menu (Para 3000's):
Turn power switch to OFF.
Hold B and S, turn power switch ON, wait until "init" is displayed.
Release B then release S.
Select parameter: B (value blinks)
Change parameter value: R/S
Confirm new value: B
Exit Installer Menu: Wait min. 10 seconds. Turn power switch to
OFF. Turn power switch ON.
11/1/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
STARTUP PRECEDURE - WATER HEATER APPLICATION
(Prior to startup, see page 7 for Combustion Calibration)
1. Open the manual gas shutoff valve.
2. Turn power switch ON
3. Change storage tank water temperature: C/A. Press B to save.
NOTE: If the burner fails to ignite within 60 seconds, the boiler will
attempt ignition another four times. Consult O&M manual if the
boiler reaches a lockout condition after four ignition retries.
A - Setpoint Button (–): lowers the heating setpoint.
B - Multifunction button: resets any lockouts; accesses user and installer menus.
C - Setpoint Button (+): raises the heating setpoint.
D – Flame icon: indicates that a flame is present.
E - Radiator icon. indicates that a heating service is enabled. Blinks when heating service is active.
H - Unit of measure of the pressure (M).
F - Faucet icon: Indicates that the domestic hot water service is enabled. Blinks when domestic hot water service is active.
L - Burner unit indicators: Lights up when burner is burning; blinks when burner is in lockout or has a block ing error.
M - Pressure gauge and parameter display.
G - Gear icon: indicates access to the installer menu.
N - Supply or indirect water heater temperature gauge and display of parameter values.
0 - Unit of measure of the temperature (N).
P - Sensor icon: indicates that the outdoor sensor is active.
R - Multifunction button (+): raises the domestic hot water temperature; scrolls through parameters; increases
parameter values.
S - Multifunctional button ( –): lowers the domestic hot water temperature; scrolls through parameters; decreases
parameter values.
T - On-Off power switch.

WATER HEATER APPLICATION

Basic Wiring and Settings:
•
Main Power supply: Terminals 101/102/PE
•
Low Water Cut Off: Terminals 103/104
•
Storage tank pump: Terminals 113/114
•
Storage tank sensor: Terminals 8/9
(replace factory installed header sensor)
Set Para. 2003=0
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