16
|
3
. INSTALLATION NOTES
3
.
1
. Use of the Manual
This manual covers the installation and operation of the nVent RAYCHEM
HWAT-ECO-GF controller and must be used with the following additional
documents: HWAT System Product and Selection Design Guide (H
57538
)
HWAT System Installation and
Operation Manual (H
57548
).
IMPORTANT:
For the nVent warranty and agency approvals to apply,
the instruc tions included in this manual and product packages must
be followed.
WARNINGS:
For over voltage protection (e.g. in case of thunderstorm)
we recommend the use of an external over voltage protection device.
Per ASHRAE Guideline
12
-
2020
, maintaining hot water temperatures
consistently above
120
°F (
49
°C) between the water heater and fixtures
has been used successfully as a Legionella control method.
Care and maintenance
Clean the HWAT-ECO-GF with a soft damp cloth only, do not use any
solvents. Do not pour water directly on the device. Do not use a water
hose or a high pressure cleaner.
Pre-Installation testing
Prior to installing the HWAT-ECO-GF controller, perform the insulation
resistance (Megger) test and circuit length verification (Capacitance)
test on the heating cable as detailed in the HWAT System Installation and
Operation Manual (H
57548
).
Installing the controller
Install the controller in an indoor, dry, clean, acces sible location. If using
the optional pipe temperature sensor, make sure you install the controller
within
328
ft (
100
m) of where you want to monitor the pipe temperature.
The control unit can operate also without installed Boiler or Pipe sensor.
Opening the controller
WARNING:
To prevent shock, always switch off the power supply
(circuit breaker) before opening the controller.
The HWAT-ECO-GF has a removable front cover. Both the cover and the
box have electronic parts and are connected to each other by an Ethernet
cable. First unscrew the four screws in the cover.
3
.
2
. Description
The HWAT-ECO-GF control unit has been developed for operation with the
self-regulating heating cables: nVent RAYCHEM HWAT-R
2
or HWAT-P
1
.
The nVent RAYCHEM Hot Water Temperature Maintenance (HWAT)
system is a comfort system providing instant hot water at the tap. A self-
regulating heating cable is positioned on the pipe and compensates for
any temperature loss of the warm water.
The HWAT-ECO-GF control unit combines the following features:
• The operating temperature of the heating cable can be limited to a
desired temperature. Combined with the integrated “power off” timer
function, this offers important energy savings.
• Energy can be saved upon activation of the “trace boiler” function
and installation of the boiler sensor. The maintain temperature of
the heating cable will automatically be lowered in case the boiler
temperature is reduced, preventing the heating cable from using too
much energy for heating the water in the pipes.
• On larger and more complex domestic hot water systems, the HWAT-
ECO-GF controller can be delivered in different prefabricated panels,
depending on the quantity of heating circuits (
3
,
6
or
9
).
• An alarm terminal makes remote reading of errors possible.
