Camus Hydronics Avenger Series - 4.10 LOW WATER CUTOFF

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4.7 INSTANTANEOUS WATER HEATER
An instantaneous water heater is designed to deliver hot water without the use of a storage tank. It is suitable for applications with variable
load such as restaurants, condominiums, apartments and motels and typically used in conjunction with tempering valves to achieve
temperature control. In some applications it may be appropriate to provide a flow through tank to act as a buffer. Consult factory for
recommendations. (See Figure 17)
Figure 17: Typical Instantaneous Water Heating System
Table 8: Flow and Pressure Drop (Ft.) at a Given Temperature Rise
Heat Exchanger Head Loss and Flow
Model
20°F
40°F
60°F
US GPM
ΔP-FT
US GPM
ΔP-FT
US GPM
ΔP-FT
AR(N,P)-1000
94.4
22
47.2
5.8
31.5
3.1
AR(N,P)-1500
141.6
11.5
70.8
3.7
47.2
2.4
AR(N,P)-2000
188.6
4.37
94.3
1.46
62.87
0.94
AR(N,P)-2500
235.5
6.63
117.75
1.93
78.5
1.18
AR(N,P)-3000
284.1
4.9
142.05
2.17
94.7
1.15
AR(N,P)-3500
332.2
6.9
166.1
1.8
110.7
1.1
AR(N,P)-4000
374.5
9.0
187.2
2.1
124.8
1.2
4.8 WATER HEATER THERMOSTAT SETTING
1. This appliance is provided with an electronic temperature controller as detailed in Section 6.
2. The maximum setting for this water heater is 140°F.
3. There is a hot water scald potential if the temperature controller is set too high.
4.9 WATER FLOW SWITCH
A water Flow Switch (ships loose) is to be installed in the outlet piping on all heating boilers and hot water supply boilers. The Flow Switch
is wired in series with the 24VAC safety control circuit.
4.10 LOW WATER CUTOFF
If this boiler is installed above radiation level, a Low Water Cut-Off (LWCO) device must be installed at the time of boiler installation.
Some local codes require the installation of a Low Water Cut-Off on all systems. Electronic Low Water Cut-Offs are available as a factory
supplied option on all models. Low Water Cut-Offs should be tested every six months, including flushing of float types. The normally open
switch contact of the Low Water Cut-Off is to be wired in series with the flow switch. A Hold condition message will be indicated on the
control display on a low flow condition.