EK-Pak Owner and Installation Manual
EK-Pak Owner & Installation Manual First Edition December 2002
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If two meters are used, the equations below can be used to determine the air-free level of
CO in a combustion gas sample.
For natural gas or propane, using as-
measured CO ppm and O2 percentage:
CO AFppm
=
20.9
x
CO ppm
20.9-O2
For propane, using measured CO ppm and
CO2 percentage:
CO AFppm
= 14
x
CO ppm
CO2
For natural gas, using measured CO ppm
and CO2 percentage:
CO Afppm =
12.2
x
CO ppm
CO2
Where:
CO AFppm
= Carbon monoxide, air-free
ppm
CO ppm
= As-measured combustion gas
carbon monoxide ppm
O2
= Percentage of oxygen in combustion
gas, as a percentage
CO2
= Percentage of carbon dioxide in
combustion gas, as a percentage
Annual Maintenance:
WARNING: Turn off the electrical power supply, the manual gas shut off valve and the manual
water control valve before servicing.
The unit should be checked once a year or as necessary by a certified and trained technician.
If repairs are needed, the repairs should be made by a certified and trained technician.
The following systems and parts should be checked. Refer to the heating module manual for
details and specific instructions.
1. Venting systems
2. Burners
3. Manual operation of the pressure relief valve
4. Periodic cleaning of the system strainer
5. Heat exchanger. Remove the thermistor and check it for mineral coating. A coating on
the thermistor requires flushing the heat exchanger with a descaling solution. Scale
build up will void your warranty and shorten the life of your water heater.
Troubleshooting:
Heating Module Water Isn’t Hot Enough
First check that gas supply line is sized properly and that the gas pressure is within the
required range. If the gas supply line checks out good then check the plumbing for mixing
valves, scald protection, single handled valves or crossed connections. If the unit is
performing properly and is not undersized the output temperature can be adjusted with the dip
switches on the unit or by using the Plug In Service Aid/Remote.
It Takes too Long for the Heating Module to Heat Up
The unit only takes six seconds to ignite and six more to reach operating temperature. If the
unit is taking longer then twelve seconds to initiate, check the system strainer and the flow
sensor for debris or damage.
