Hydronic Piping - ECR International AT Serie Manuel D'installation, D'utilisation Et D'entretien

!
WARNING
Fire, explosion, asphyxiation, burn, scald
and electrical shock hazard. System design
must incorporate primary/secondary piping
to allow boiler pump to prepurge and post
purge the unit before and after energizing the
heating element. Shortened element life and/
or opening of safety relief valve could occur.
Failure to follow these instructions could result
in death or serious injury.
Circulating System
• Design system as primary/secondary piping
to ensure proper water flow through boiler.
See Figure 2. Operate boiler with maximum
output temperature of 180ºF (82°C) or less and
temperature rise across the unit of 20ºF (11°C)
or lower. Refer to tables below and Figures 2 & 3.
Note: Refer to Figure 18, pg. 27 for typical pump
curve.
• Return water temperature must be higher than
room temperature in which boiler is installed to
prevent condensation.
"AT" Series - 2 Element Boiler
kW Capacity
6
8
10
12
"AT" Series - 4 Element Boiler
kW Capacity
12
16
20
24
* Flow rate based on 20°ΔT
Note: See Figure 18, pg. 27 for typical pump curve
Connecting Supply And Return Piping
1. Hot water boilers installed above radiation level
must be provided with low water cutoff device
either as part of boiler or at time of boiler
installation.
2. When boiler is connected to heating system
utilizing multiple zone circulators, each circulator
must be supplied with flow control valve to
prevent gravity circulation.
3. Reduced pressure back flow preventer must
be present under provisions required by
Environmental Protection Agency, (EPA).

HYDRONIC PIPING

Minimum Flow Rate (gpm)*
2.0
2.7
3.4
4.1
Minimum Flow Rate (gpm)*
4.1
5.5
6.8
8.2
4. Manufacturer requires plumbing arrangements as
illustrated in Figures 2 & 3. Inlet or return pipe is
located at bottom of unit. Reverse flow will result
in noisy operation and cause very early element
failure. Drain cock is to be located at lowest point
of piping.
5.
Outlet or supply pipe line to radiation is located
at top of unit. Combination temperature pressure
(altitude) gauge is provided with each unit and
should be installed close to boiler outlet. It
is important the gauge sensor be completely
immersed in flowing water to assure correct
temperature readings.
6. Install gate valves at locations shown in Figures
2 & 3, so any boiler servicing requiring removal
of water can be done quickly and easily. Not
illustrated but recommended is installation of air
vents at high points of hydronic system to reduce
initial start up time and help avoid element
burnout during entire life of heating system.
7.
Safety relief valve is supplied with each Electric
Hydronic Block and must be installed vertically.
Install at location and discharge direction shown
using pipe nipple and elbow supplied. See Figure
1. Add piping so any water discharged will not
damage boiler or other system components and
to protect from scalding.
8. For further piping information refer to Hydronics
Institute (AHRI) manual (Installation Guide
for Residential Hydronics).
9.
Pipe the discharge outlet of the safety relief valve
within 6 inch of the floor.
Figure 1A - Safety Relief Valve
Pressure
Gauge
8
Safety Relief
Valve
Discharge to drain
within 6 inches of floor
or per local codes
PN 240013676 REV. A [07/01/2022]