LP-179 Rev. 6.7.16
36
In unusually dirty or dusty conditions care must be taken
to keep water heater burner door in place. Failure to do so
VOIDS warranty.
Allowing the heater to operate with a dirty combustion
chamber will hurt operation. Failure to clean the heat
exchanger as needed by the installation location could result
in heater failure, property damage, personal injury, or death.
Such product failures ARE NOT covered under warranty.
Part 9 - Shutdown
A. Shutdown Procedure
If the burner is not operating, disconnect the electrical supply.
If the burner is operating, lower the set point value to 70
o
F
and wait for the burner to shut o. Continue to wait for the
combustion blower to stop, so all latent combustion gases
are purged from the system. This should take a maximum of
40 to 90 seconds. After combustion gases are purged turn o
electrical power to the water heater.
B. Vacation Procedure
If there is danger of freezing, change the set point to 70
o
F. DO
NOT turn o electrical power. If there is no danger of freezing,
follow “Shutdown Procedure”.
C. Failure to Operate
Should the burner fail to light, the control will perform two
more ignition trials prior to entering a lockout state. Note that
each subsequent ignition trial will not occur immediately. After
a failed ignition trial, the blower must run for approximately
10 seconds to purge the system. Therefore, a time period of
approximately 40 to 90 seconds will expire between each
ignition trial.
If the burner lights during any one of these three ignition
trials, normal operation will resume. If the burner lights, but
goes o in about 4 seconds, check the polarity of the wiring.
See electrical connection section of this manual.
If the burner does not light after the third ignition trial, the
control will enter a lockout state. This lockout state indicates
that a problem exists with the water heater, the controls, or
the gas supply. Under such circumstances, a qualied service
technician should be contacted immediately to properly
service the water heater and correct the problem.
If a technician is not available, pressing the S4 button will
remove the lockout state so additional trials for ignition can
be performed. The unit will try to relight once every 6 minutes.
Resistance Table for Supply Temperature Sensor
High / Low Temp Sensor Temp. (
o
F) Resistance (Ohms)
32 32550
41 25340
50 19870
59 15700
68 12490
77 10000
86 8059
95 6535
104 5330
113 4372
122 3605
131 2989
140 2490
149 2084
158 1753
167 1481
176 1256
185 1070
194 915
202 786
212 667
Table 15 - Supply Temperature Resistance Sensor
D. Important Notice
It is extremely important that whenever work is performed on
the plumbing system that either:
• The water heater is powered o, or,
• The water heater is valved o and isolated from the
plumbing system.
Failure to take these measures could result in a dry-ring
condition.
The water heater must be full of water and the system fully
purged BEFORE powering the water heater. Performing any
work in the plumbing system without either powering o
the water heater or isolating the water heater through the
use of shut-o valves could result in a condition referred to
as “dry-ring”. Dry-ring the water heater will damage the
heat exchanger, and could result in property damage, serious
personal injury, or death. Such damages ARE NOT covered by
water heater warranty.
Part 10 - Troubleshooting
A. Error Code
An error code may occur during installation of the heater. This
condition may lead to a lock out condition of the controller, which
will need to be manually reset by pressing S4. The following
information will help the installer correct the problem before
going into a lockout condition, which will require a manual reset.
Figure 29 - Sealing the Water Heater for Sanitary Applications
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