Trinity
│
Installation and Operation Instructions
Ti Series
34
Inlet Water Temperature (deg. F)
40
45
50
55
60
65
70
O
u
tlet W
ater
(
F
)
110
3.9
4.2
4.5
4.9
5.4
6.0
6.7
115
3.6
3.9
4.2
4.5
4.9
5.4
6.0
120
3.4
3.6
3.9
4.2
4.5
4.9
5.4
125
3.2
3.4
3.6
3.9
4.2
4.5
4.9
130
3.0
3.2
3.4
3.6
3.9
4.2
4.5
135
2.8
3.0
3.2
3.4
3.6
3.9
4.2
140
2.7
2.8
3.0
3.2
3.4
3.6
3.9
Inlet Water Temperature (deg. F)
40
45
50
55
60
65
70
O
u
tlet W
ater
(
F
)
110
5.1
5.5
6.0
6.5
7.2
8.0
9.0
115
4.8
5.1
5.5
6.0
6.5
7.2
8.0
120
4.5
4.8
5.1
5.5
6.0
6.5
7.2
125
4.2
4.5
4.8
5.1
5.5
6.0
6.5
130
4.0
4.2
4.5
4.8
5.1
5.5
6.0
135
3.8
4.0
4.2
4.5
4.8
5.1
5.5
140
3.6
3.8
4.0
4.2
4.5
4.8
5.1
To avoid having too much flow at the faucets use the throttling valve located at the “Cold Supply” in Figure 10-1 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 Sentry “LO” setting and repeat this step. (It is beneficial to keep the “LO” setting as low as
possible to limit short cycling and maintain efficiency)
If the flow rates listed in Tables 10-1 and 10-2 are not high enough for the application, install a storage
tank with re-circulating loop as per below and Figure 10-2.
Trinity Combi 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 10-2. 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 Trinity Combi (see Figures
10-1(c) and (d) for identification of plumbing fittings). The DHW flow switch senses the water flow and triggers a DHW demand;
heated water flows from the Combi and enters the inlet fitting of the storage tank.
In lieu of the DHW flow switch, NTI recommends using an isolation relay activated with the potable re-
circulating pump. The isolated end-switch of the relay would be wired to the boiler’s A-C terminals in
place of the flow switch wires.
Table 10-1 Ti150 Combi DHW Flow Rates (USgpm)
Table 10-2 Ti200 Combi DHW Flow Rates (USgpm)
