1-11.1. DIFFERENCE BETWEEN MODELS. Two different models of the reverse osmosis water purification unit are covered by the
information contained in this manual. This paragraph defines the differences between each of these models. These two models are as
MANUFACTURED BY AQUA-CHEM, INC.
MANUFACTURED BY KECO INDUSTRIES
The following list defines the major differences between Model WTA-060 and Model ROWPU-1.
Cyclone Separators. (Refer to Figure 1-7.1.) The cyclone separation system used on the WTA-060 model consists of two
separators (1) mounted on a separate frame (2) which is placed on the ground near the ROWPU (3). The cyclone separation system
for the ROWPU-1 model consists of only one cyclone separator (4) which has been fabricated to be mounted in one of the stake
pockets on the M871 trailer (5) used to transport the ROWPU system. As a result of this difference, the piping system on the raw water
pump (6) and the raw water hose (7) routing have been modified as shown in the illustration.
Raw Water Strainer System. (Refer to Figure 1-7.2.) The strainer system used on the WTA-060 model uses a single strainer
(1) in the piping system to strain raw water entering the ROWPU. The ROWPU-1 model, however, is equipped with a dual strainer
system (2) which allows the ROWPU system to remain in operation while either of the two strainers is being cleaned. One strainer is
kept in operation at all times through the use of two manual valves (3).
Automatic Valves. (Refer to Figure 1-7.3.) Throughout the ROWPU system a series of automatic valves are used to direct
the water as it passes through the ROWPU piping. The type of automatic valves (1) used by the WTA-060 model looks slightly different
than the automatic valves (2) used on the ROWPU-1 model. Although the appearance of the valves is different, the function of the
valve is identical. The repair procedures differ slightly and are indicated in the related paragraphs for the maintenance of these valves.
Control Panel Gauges Drain Valves. (Refer to Figure 1-7.4) To prevent freezing of the gauges (1) used on the top of the
control panel, the ROWPU-1 model of the ROWPU has been equipped with valves (2) which are used to drain fluids form the gauges
and gauges tubing prior to shutdown or storage of the unit in cold or freezing conditions. The WTA-060 model of the ROWPU does not
have these valves.
Pressure Switches. (Refer to Figure 1-7.5.) Various pressure switches are used in the piping system of the ROWPU to
indicate how various parts of the piping system are functioning. The pressure switches (1) used on the ROWPU-1 model of the
ROWPU have a different appearance than the pressure switches (2) used on the WTA-060 mode. Although the appearance of these
switches is different, the function of each switch is identical. The repair procedures differ slightly and are indicated in the related
paragraphs for the maintenance of these switches.
High Pressure Pump Jog Switch. (Refer to Figure 1-7.6.) To prevent the cracking of the high pressure pump housing during
freezing, the ROWPU-1 model of the ROWPU has been equipped with a jog switch (1) used to momentarily jog the high pressure pump
to remove any water that may have been left in the pump housing during the shutdown process. The WTA-060 model does not have
Roof Design. (Refer to Figure 1-7.7.) The roofing material used on the ROWPU-1 model has been redesigned to incorporate
a one piece roofing skin (1). The WTA-060 model is equipped with a roof design that uses many roof sections to form the roof (2).
Change 12 1-12.1