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TRX Series II - Installation - Startup - Maintenance Instructions
F. By-Pass Valve
TRX085 - TRX120
TRX110C
-
TRX150C
This boiler has a by-pass valve which requires no adjustment.
The by-pass valve protects the heat exchanger from overheating by
guaranteeing a minimum flow rate of 2 gpm within the primary heat
exchanger. This protects the primary heat exchanger from overheating
when water circulation is insufficient or heating system load is reduced
(ex: due to the response of thermostatic valves or zone valves).
The by-pass valve is located:
- in the left hydraulic block for TRX085 and TRX120.
- in the right hydraulic block , behind the three-way valve, for
TRX110C
and
TRX150C.
G. CH and DHW Pressure Relief Valves
This boiler has a high-temperature shut-off switch built in as a standard
safety feature. Therefore, a “pressure only” relief valve is required.
DO NOT operate this appliance before the supplied pressure relief
valve is installed with sufficient relieving capacity in accordance with
the ASME rating plate on the appliance.
E. Internal Circulation Pump
To calculate the size of the heating installation refer to the graph below.
0
4
8
12
16
20
24
0 1 2 3 4 5 6 7
gal/min
feet
Graph Representing the Available Circulation Pump Head
The pressure relief valve must be installed with the provided adaptor
pipe in the top of the boiler as detailed in Figure 20. No other valves
should be placed between the pressure relief valve and the appliance.
Failure to comply with these guidelines can result in substantial
property damage, personal injury, or death.
Figure 15 - Internal Circulation Pump NOTE: Ensure the Air
Vent on the Internal Circulation Pump Remains
Open after Installation
Figure 16 - By-Pass Valve Location
Figure 17 - By-Pass Valve Assembly
WARNING
Part 4 - Water Piping
Table 11 - Internal Circulation Head Curve
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