NTI Matrix Installation And Operation Instructions Manual page 37

Matrix
Procedure for Setting up Domestic Hot Water – If the Matrix is being installed in an application that uses
municipal water, often the pressure is high enough to generate flow rates at the faucets that will exceed the
appliances capacity to heat it. See the following tables to determine what flow can be expected at various inlet
and outlet water temperatures.
Table 11-1 Matrix DHW Flow Rates (USgpm)
40
110 3.9
115 3.6
120 3.4
125
3.2
130 3.0
135 2.8
140 2.7
To avoid having too much flow at the faucets use the throttling valve located at the "Cold Supply" in Figure 11-1
to limit the overall flow of domestic hot water. Follow these instructions to achieve the best delivery of DHW:

Open throttle valve fully.

Turn the dial on the mixing valve to the desired setting (do not exceed 120˚F).

Create the maximum amount of DHW flow that is likely to occur on a regular basis. (Usually tub faucet,
or choose two other faucets)

Allow the boiler to reach steady state, and then throttle the shut-off valve until the hot water exiting the
plate heat exchanger is slightly warmer than the mixed water exiting the mixing valve. Ensure the boiler
is firing at the maximum rate, if not increase the "H20" setting and repeat this step. (It is beneficial to
keep the "H20" setting as low as possible to limit short cycling and maintain efficiency).
If the flow rates listed in Table 11-1 are not high enough for the application, install
a storage tank with re-circulating loop as per below and Figure 11-2.
Matrix w/ DHW Storage Tank
To completely avoid the DHW limitations inherent with on demand hot water heating, install a DHW storage tank
as per the DHW plumbing schematic shown in Figure 11-2. When the tank temperature is insufficient, an Aqua-
stat (T-stat) located within the storage tank completes a 120VAC circuit to a potable (bronze or Stainless Steel)
circulating pump. The pump circulates water from the bottom of the storage tank (typical location of a drain
fitting) to the DHW inlet fitting of the Matrix (see Figure 10-1 for identification of plumbing fittings). The DHW
flow meter senses the water flow and triggers a DHW demand; heated water flows from the Matrix and enters the
inlet fitting of the storage tank.
Inlet Water Temperature (deg. F)
45 50 55
4.2 4.5 4.9
3.9 4.2 4.5
3.6 3.9 4.2
3.4 3.6 3.9
3.2 3.4 3.6
3.0 3.2 3.4
2.8 3.0 3.2
Installation and Operation Instructions
60 65 70
5.4 6.0 6.7
4.9 5.4 6.0
4.5 4.9 5.4
4.2 4.5 4.9
3.9 4.2 4.5
3.6 3.9 4.2
3.4 3.6 3.9
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