LP-454 Rev. 004 Rel. 002 Date 12.1.17
34
Combustion Settings on All Models
Fan Speed
Natural Gas (NG) Propane (LP)
Low Ignition High Low Ignition High
Carbon
Monoxide
(CO) PPM
1-10 2-15 2-20 1-10 2-15 2-20
Carbon Dioxide
(CO
2
) %
8-10 8 1/2- 10 1/2 9-11
Table 13 - NOTE: Low Fire CO2 Shall be Equal to or Less Than .5% of the
High Fire Measurement
Fan Speeds
BTU Ignition Min Max
199,000*
3000
2200 9800
199,000 D Model
2000
5850
260,000 7600
320,000
2200
7800
399,000 9800
Table 14 - *Model has a Single Combustion System
E. Maintenance
The control system requires no periodic maintenance under normal
conditions. However, in unusually dirty or dusty conditions, periodic
vacuuming of the cover to maintain visibility of the display and
indicators is recommended. In dirty environments, such as construction
sites, care must be taken to keep the water heater burner cover in place
and drywall or saw dust away from water heater.
Ignition issues may result if Low Fire CO2 measures greater than .5%
of the High Fire Measurement.
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 10 - 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
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.
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
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.
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.
To Next Page
Need help?
General
