GF-135
Esteem 399 Low NOx Boiler
Chapter 18
OMM-0089_0A
Installation, Operation & Maintenance Manual Controller Operation
Page
149
of
188
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
c)
Pipe Mounted Installation:
A temperature sensor (P/N PTSENS12) can be directly
strapped to the outside of a 1” to 3” pipe. Install the PTSENS12 sensor as follows:
Installing a Pipe Mounted System Temperature Sensor
1. Remove the white plastic cover from the
PTSENS12
sensor.
2. Cut a small slit in the seal gasket on the end of the sensor.
3. Route 18 AWG 2-wire cable or similar cable through the seal gasket into the enclosure.
4. Push down on the orange wire terminal retainers to insert the wires into the sensor terminals.
Release the orange wire terminal retainers and confirm that the wires are firmly attached to
the sensor terminals.
5. Select a location for the sensor on the common supply header downstream of all boilers in
the system. Clean the pipe with fine sandpaper or emery cloth to ensure the pipe is clean and
sensor will make good contact with the pipe.
6. Press the white cover onto the sensor and strap the sensor to the pipe using the included
wire tie.
7. Wire the sensor to terminals 15 and 16 of the Master boiler.
18.7.3 Cascade Installation – Cascade Communication Cable
A communication cable (P/N PTCAB01) must be installed between each boiler in the Cascade
System. The cable has a 6-pin Molex connector on one end and bare wires on the other end.
The Molex connector plugs into the Cascade Slave connector of the Slave boiler. The bare wires
terminate on the Cascade Master terminals of the Master boiler or prior Slave boiler in cascades
of three or more boilers. Reference Figures 18-48, 18-50, and 18-52 for wiring details. The
connections are as follows:
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Red Wire to Terminal #17
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White Wire to Terminal #18
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Black Wire & Cable Shielding to Terminal #19
18.7.4 Cascade Installation – Low Voltage Wiring Connections
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Thermostat Wiring:
CH1 and CH2 calls must be wired into the Cascade Master.
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Outdoor Sensor Wiring:
The outdoor temperature sensor must be wired into the Cascade
Master.
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Domestic Hot Water Wiring:
A DHW call must be wired into the Cascade Master.
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Additional Boiler Limits:
Boiler Limits must be wired into each boiler in the Cascade
System. When a boiler limit opens, that particular boiler will lockout and will be removed
from Cascade System operation. The other boilers in the Cascade System will continue to
operate if they are not in a lockout.
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External Modulation Control:
An External Modulation Signal must be wired into the
Cascade Master. The modulation signal will control the firing rate of the entire Cascade
System, not just the Cascade Master.
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Modbus Wiring:
A building management system (BMS) connection must be wired into the
Cascade Master.
