AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 88)

GF-135 Esteem 399 Low NOx Boiler
Chapter 11
OMM-0089_0A Installation, Operation & Maintenance Manual Start-Up Preparation
11.4 CHECK FOR GAS LEAKS
WARNING!
Prior to start-up and during initial operation, smell near the floor
and around the unit for gas odorant or any unusual odor. Do not
proceed with the start-up if there is any indication of a gas leak.
Any leaks found must be repaired immediately.
WARNING!
Propane installations only:
the propane supplier mixes an
odorant with the propane to make its presence detectable. In some
cases the odorant can fade and the gas may no longer have an
odor. Prior to start-up of the unit and periodically after start-up have
the propane supplier check and verify the odorant level.
11.5 CHECK THERMOSTAT CIRCUIT
Perform the following to check the thermostat circuit.
Checking the Thermostat Circuit
1. Disconnect the external thermostat wires from the low voltage terminal strip.
2. Connect a voltmeter across the wire ends of the external thermostat wiring.
3. Close each thermostat, zone valve and relay in the external circuit one zone at a time and
check the voltage reading across the wire ends.
4. There should NEVER be voltage measured at the wire ends.
5. If voltage is measured at the panel under any condition, check and correct the external
wiring.
NOTE
In systems using 3-wire zone valves, back-feed of voltage to the
unit is a common problem. Use an isolation relay to prevent
voltage from the external circuit entering the Esteem control panel.
6. Reconnect the external thermostat wires to the low voltage terminal strip.
Page 88 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288