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Lx – WH Series
10.0 WATER HEATER PIPING
The heat exchanger of the Trinity water heater is designed to attain the highest level of heat transfer in a compact
design. To accomplish this, the heating water flows through a series of fin shaped tubes, designed to maximize
the heat transfer area. To maintain the efficient and reliable operation of the heat exchanger, and to avoid heat
exchanger failure, it is critical to ensure the rules and guidelines in this section are followed.
Failure to follow the instructions provided in this section will void the NTI warranty and
may result in property damage, fire, serious injury or death.
Water Heater System Preparation
Prior to connecting plumbing to the water heater, flush the entire system to ensure it is free of sediment, flux,
solder, scale, debris or other impurities that may be harmful to the system and water heater. During the
assembly of the piping system, it is important to keep the inside of the piping free of any debris including
construction and copper dust, sand and dirt. Toxic chemicals, such as used for boiler treatment, shall not be
introduced into the potable water system.
Water Chemistry – The installer of the Trinity Lx water heater must consider the condition of the potable
water. Ensure the water condition falls within the following recommended parameters to avoid scale build-
up and aggressive PH levels that can result in corrosive reactions and damage to the heat exchanger and
system components:
Conductivity – 170 to 400 µS/cm (at 25ºC); [TDS 80 to 200 ppm or Total Hardness 5 to 12 grains/USgal.]
Water heater water that falls outside of the parameters listed above must only be
conditioned or treated with products approved for potable hot water systems. Toxic
chemicals, such as used for boiler treatment must not be introduced into the potable
water system.
Potable Water Systems
This water heater is suitable for water (potable) heating and space heating. The water heater can be configured
for "water (potable) heating only" or "combination space heating" and is subject to the following requirements:
1) Piping and components connected to the water heater for use with water (potable) heating or combination
space heating applications shall be suitable for use with potable water.
2) Toxic chemicals, such as used for boiler treatment, shall not be introduced into the potable water system.
3) This water heater which will be used to supply potable water shall not be connected to any heating system or
component(s) previously used with a non-potable water heating appliance.
4) When the system requires water for space heating at temperatures higher than required for other uses, a
means such as a mixing valve shall be installed to temper the water for those uses in order to reduce scald
hazard potential.
Definitions of Potable Water Systems
Each potable water system described below is meant to be used with a storage tank (refer to Table 10-1):
Water (Potable) Heating Only - refers to an open potable water system dedicated to providing domestic
hot water and is not intended for space heating.
Combination Space Heating - refers to an open potable water system where the domestic hot water and
heating system water are drawn from the same storage tank. Heat exchange typically takes place in the water
heater and there is no separation or differentiation between water used for domestic hot water and water used
for space heating.
Storage Tank (Vessel) - refers to a tank used to store hot water that is heated indirectly by a water heater
external to the tank or a container provided for storage of hot water under pressure.
Combination Space Heating - A boiler with indirect fired water heater is the preferred
method for combination space heating; therefore, the building owner assumes all risk and
responsibility with respect to installation, maintenance, and operation of this water heater
in a combination space heating application. Failure to follow instructions may result in
possible illness or death.
Installation and Operation Manual
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Trinity Lx-WH
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