Service Manual
8
1 Service
General Operation
How the boiler operates
The Crest uses an advanced stainless steel heat exchanger and
an electronic control module that allows fully condensing
operation. The blower pulls in air and pushes flue products
out of the boiler through the heat exchanger and flue piping.
The control modules regulate the firing rate of the boiler by
adjusting blower speeds and valve positions to maintain the
proper fuel air ratios.
How the control modules operate
The Crest boiler is equipped with a SMART TOUCH
CON•X•US Interface. The control module receives inputs
from boiler sensors and external devices. The control module
activates and controls the blowers and gas valves to regulate
heat input and switches the boiler, Hot Water Generator
(DHW), and system pumps on and off as needed. The user
programs the control module to meet system needs by adjusting
control parameters through the SMART TOUCH CON•X•US
Interface. These parameters set operating temperatures and
boiler operating modes.
Sequence of operation
Table 1A (page 11) shows control module normal
sequences of operation for space heating and DHW
operation. The combined operation sequence is for
a typical application, programmed to provide DHW
priority.
Access modes
User
The USER can set the SH set point, DHW set point, turn
the unit OFF and ON and set up WiFi.
Installer
Most parameters are available only to the INSTALLER,
accessible only by entering the installer password (5309)
when selecting the Setup Section.
Note: The password will timeout after an hour from
entry.
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