nvent RAYCHEM HWAT-ECO Installation And Operation Manual

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Download Full EN Manual

HWAT-ECO

INSTALLATION AND OPERATION MANUAL FOR
HOT WATER TEMPERATURE MAINTENANCE
SYSTEM ELECTRONIC CONTROLLER

Raychem-IM-H57340-HWATECOcontroller-EN-1805

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Important Safeguards and Warnings

WARNING: FIRE AND SHOCK HAZARD

nVent RAYCHEM HWAT Systems must be installed correctly to ensure
proper operation and to prevent shock and fire. Read these important
warnings and carefully follow all the installation instructions.

• To minimize the danger of fire from sustained electrical arcing if the
heating cable is damaged or improperly installed, and to comply with
nVent Thermal Management requirements, agency certifications, and
national electrical codes, ground-fault equipment protection must be
used on each heating cable branch circuit. Arcing may not be stopped
by conventional circuit breakers.

• Approvals and performance are based on the use of nVent Thermal
Management parts only. Do not substitute parts or use vinyl electrical
tape.

• Bus wires will short if they contact each other. Keep bus wires
separated.

• Connection kits and heating cable ends must be kept dry before and
during installation.

• The black heating cable core is conductive and can short. They must
be properly insulated and kept dry.

• Damaged bus wires can overheat or short. Do not break bus wire
strands when preparing the cable for connection.

• Damaged heating cable can cause electrical arcing or fire. Do not use
metal attachments such as pipe straps or tie wire. Use only nVent
Thermal Management approved tapes and cable ties to secure the
cable to the pipe.

• Do not attempt to repair or energize damaged cable. Remove
damaged cable at once and replace with a new length using the
nVent RayClic-S splice kit. Replace damaged connection kits.

• Use only fire-resistant insulation which is
compatible with the application and the maximum exposure
temperature of the system to be traced.

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Table of Contents

1

General Information 1

1.1 Use of the Manual 1

1.2 Features 1

1.3 Technical Data 3

1.4 Care and Maintenance 7

1.5 HWAT Heating Cables 7

2

Installation 9

2.1 Installing the Controller 9

2.2 Wiring the Controller 13

3

Programming the Controller 26

3.1 Programming Overview 26

3.2 Initializing the Controller 27

3.3 Advanced Programming 33

4

Error/Alarms and Troubleshooting 45

5

Pre-Defined Programs 50

6

Heat-Up Cycle Graphs 52

7

Cool-Down Graph 54

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A

F

B

C

D

E

Item Qty Description

A 1 HWAT-ECO controller
B 1 Temperature sensor with 13 ft (4 m) cable
C 2 Mounting screws
D 2 Mounting washers
E 1 Aluminum tape
F 1 Manual

INSTALLATION AND OPERATION MANUAL FOR

HOT WATER TEMPERATURE MAINTENANCE

SYSTEM ELECTRONIC CONTROLLER

THERMAL MANAGEMENT SOLUTIONS

WWW.THERMAL.nVent.COM

HWAT-ECO

Figure 1: Kit contents

Raychem-IM-H57340-HWATECOcontroller-EN-1805

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Power supply (green LED)

Power to heating cable (green LED)

Heat-up cycle (green LED) - increased risk of scalding

Pipe Temperature alarm (requires installed sensor) (green LED)

Alarm (red LED)

Escape, backspace; NO; or display maintain temperature setpoint

Arrow keys: to change menu selection or position the cursor

Confirm selection, new value or YES

6.5"

(165 mm)

2 ea - 1/2" conduit

entries

To water heater sensor
To HWAT-ECO network/alarm
entries

3.4"

(85 mm)

A
B
C
D
E

F
G
H

A

B

C

D

E

F

G

H

Figure 2: HWAT-ECO controller

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General Information

1

1.1 Use of the Manual

This manual covers the installation and operation of
the HWAT-ECO controller and must be used with the
following additional documents:

• HWAT System Product and Selection Design Guide
(H57538)

• HWAT System Installation and Operation Manual
(H57548)

Important: For the nVent warranty and agency
approvals to apply, the instructions included in this
manual and product packages must be followed.

1.2 Features

The Raychem HWAT-ECO controller is designed for
operation with HWAT-Y2 and HWAT-R2 self-regulating
heating cables. The HWAT-ECO controller provides
the following features:

• Flexible temperature control of hot water

temperature maintenance systems.

• Integrated function that lowers the maintain

temperature during low use hours to save energy.

• Heat-Up cycle function that increases the water

temperature in a stagnant pipe.

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• Building Management System (BMS) interface
that receives a DC voltage to set the maintain
temperature.

• Alarm relay to signal power, temperature, or
communication problems.

• Pipe temperature monitoring, low temperature
alarm and high temperature cut-out.

• Master/slave function that allows one HWAT-ECO
to control up to eight additional HWAT-ECO
controllers.

• 9 pre-defined programs that can be customized by
the user.

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1.3 Technical Data

Use Only for HWAT-Y2 and

HWAT-R2 heating cables

Maintain temperature
setpoint

105˚F (40˚C) to 140˚F
(60˚C)

Hot water piping
ambient temperature

60˚F (15˚C) to 80˚F (25˚C)

Controller ambient
temperature

40˚F (5˚C) to 105˚F (40˚C)

ambient

Switching capacity 24 A 208/240 Vac max.

Operating voltage 208/240 (±10%), 60 Hz

Internal power
consumption

2.5 W

Circuit protection
(not provided with
HWAT-ECO controller)

Max. 30 A with 30 mA
ground-fault protection

Power terminal block 16–10 AWG (1.5–4 mm

2

)
Use copper conductors
only

Internal temperature
alarm

150˚F (65˚C)

BMS control voltage 0–10 Vdc

BMS cable maximum
length

328 ft (100 m)

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Alarm contacts Max. 24 Vdc or 24 Vac,

1A, SPST, voltage free,
NO/NC

Alarm events • Loss of power

• Controller reinitialized

• Internal controller
temperature too high

• Lost date and time
settings

• Internal failure

• Pipe temperature too
high (optional)

• Pipe heater temperature
too low (optional)

• Network error

Power correction factor To increase or decrease

your actual pipe maintain
temperature or adjust for
plastic pipe.

Pipe temperature sensor Thermistor with 13 ft

(4m) lead provided.

A PT100 RTD may be
optionally used. Max
length is 328 ft (100 m)

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Electromagnetic Complies to EN 5014-1

Compatibility (EMC) for
emission and 60730-1 for
immunity

Real time clock Leap year correction

Clock accuracy ±10 minutes per year

Enclosure rating NEMA 12 (IP54) – indoor

use only

Enclosure material ABS

Mounting Wall mount with two

screws or optional DIN rail

Conduit entries 2 ea – 1/2 in conduit entries

Cable gland 3-hole grommet

Maximum cable size:

• 2-wire: 20 AWG (0.5 mm

2

)

• 4-wire: 24 AWG (0.2 mm2)

Default programs 9 pre-defined programs

that can be customized
by user

Program settings 48 1/2-hour time blocks

of the following program
settings: Off, Economy,
Maintain and Heat-Up
cycle

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Password 4-digit password protection

Master/slave Master is selectable in the

controller, up to 8 slaves
can be connected

Master/slave cable 2-wire, min. 24 AWG

(0.2 mm

2

) twisted pair
and insulation of 300 V,
Max length cable is 100 m

Parameters in memory All parameters are stored

in nonvolatile memory,
except time and date

Clock backup time Rechargable Lithium

battery. Battery will retain
time and date for up to 30
days when power is lost

Approvals

80BJ

Type 12

Energy Management Equipment

(for use with HWAT-R2 and HWAT-Y2 heating cables only.)

Weight 2 lbs (1 kg)

Size 6.5 in x 3.4 in x 2.8 in

(165 mm x 85 mm x
71 mm)

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1.4 Care and Maintenance

To clean the HWAT-ECO use a damp cloth. Do not
use solvents. Do not pour water directly on the
device. Do not use a water hose or high pressure
cleaner.

Important: In case of questions or product failure,
please contact your nVent representative, or call nVent
at 800-545-6258.

1.5 HWAT Heating Cables

Maintain temperature

Depending on the ambient temperature and voltage,
HWAT-Y2 is designed to maintain temperatures up to

125˚F (52˚C), and HWAT-R2 is designed to maintain
temperatures up to 140˚F (60˚C).

Installing the heating cables

Install the HWAT heating cable system as instructed
in the HWAT System Installation and Operation
Manual (H57548). The controller must be installed
by a professional electrical installer familiar with
electrical safety codes and practices.

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Ground-fault protection

WARNING: To minimize the danger of fire from
sustained electrical arcing if the heating cable is
damaged or improperly installed, and to comply with
the requirements of approvals agencies, nVent and
national electrical codes, ground-fault equipment
protection must be used on each heating cable
branch circuit. Arcing may not be stopped by conven­tional circuit protection. The HWAT-ECO does not
include ground-fault protection.

Pre-Installation testing

Prior to installing the HWAT-ECO 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 (H57548).

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2.1 Installing the Controller

Install the controller in an indoor, dry, clean,
accessible 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.

Opening the controller

WARNING: To prevent shock, always switch off
the power supply (circuit breaker) before opening the
controller.

The HWAT-ECO has a removable front cover. Both
the cover and the box have electronic parts and are
connected to each other by a 14-pin connector. First
unscrew the four screws in the cover. Carefully pull
the cover straight out, not sideways!

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Figure 3: Opening the controller

Wall mounting the controller

Mount the controller using either of the options
below:

1. You can mount the controller to the wall using
the two supplied screws and sealing rings in the
two holes located inside the bottom part of the
controller.

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5.9" (148 mm)

1.7"

(43 mm)

TEMP BMS

B A

Figure 4: Hole locations for mounting with screws

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2. Optionally you can mount the controller using DIN
35 Rail mounting.

Optional Din Rail Mount

(Rail not provided)

Mounting

Removing

Press tab to remove box

Figure 5: Mounting with DIN 35 Rail

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2.2 Wiring the Controller

The diagram below shows the arrangement of the
terminal blocks for power, alarm, pipe temperature
sensor, BMS and network.

Ground

HWAT-ECO

General Arrangement

Power

terminal block

Sensor, BMS,

and network

terminal block

Alarm

terminal block

Ø

1Ø2

HWAT Line

Ø

1Ø2

TEMP BMS

B A

Figure 6: General arrangement for terminal blocks

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The diagram below shows the connection of a single
controller (without optional water heater sensor,
BMS, network and alarm connections).

Important: Tighten the terminal screws to 6 inch-

lbs. (0.68 N-m)

Ø

Ø

G

1/2"

Conduits

HWAT

heating

cable

RayClic-PC

Max. 30 A

ground fault

circuit breaker

208-240 Vac

Ground

Incoming power
208/240 Vac Max

Wiring diagram

for HWAT-ECO

To

HWAT

heating

cable

TEMP BMS

B A

Figure 7: Connecting a single controller
(w/o sensor, BMS, network and alarm connections)

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For controlling multiple HWAT circuits with the same
programming parameters (i.e. voltage, maintain
temperature, ambient temperature, economy
temperature), connect the heating cable output
relay to an external contactor coil(s).

N

ø

1

HWAT-ECO internal switch

ø3ø

2

HWAT heating cable

HWAT heating cable

Braid/pipe

Two-pole with 30-mA ground-fault trip (208/240 Vac)

Two-pole with 30-mA ground-fault trip (208/240 Vac)

Three-pole
main CB

HWAT-ECO
internal
relay

Power connection

Panel energized light

*Contactor coil

(208 or 240 V)

Heating cable

End seal

Three-pole
main contactor

Ground
Line voltage
208 V or 240 V

Install contactor
manufacturer’s recommended
snubber circuit across the coil

*

Figure 8: Multiple HWAT circuits connection

Pipe temperature sensor (optional usage)

Installation of the pipe temperature sensor is optional.
If installed, the HWAT-ECO provides low temperature
alarm and high temperature cut-out.

The temperature sensor should be connected to a
single or master controller only. Connect both wires

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of the temperature sensor to the TEMP terminal in
the controller (PL4). The sensor wires do not have a
special polarity. To connect a wire, use a screwdriver
to push down the orange tab on the side of the
terminal. Put the wire into the hole and release the
orange tab.

PL4PL3

PL5

Standard temperature sensor

PT100 sensor (2 wire)

short

for

PT100

TEMP BMS

B A

PL4PL3

PL5

TEMP BMS

B A

Alarm,

Sensor,
and BMS
terminals

PL6

Alarm contact

TEMP BMS

B A

Figure 9: TEMP terminal location and sensor wiring

Optionally, PT100 RTDs from the water heater can
be used. To install a PT100 sensor first connect a
jumper between the terminals indicated in Figure 9,
then connect the two wires from the RTD. If you are
using a three wire sensor, remove the compensation
lead and only connect the two measurement wires.

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The pipe temperature sensor must be placed on
1-inch diameter pipes or larger, installed opposite
from the HWAT heating cable to accurately measure
the pipe temperature.

The temperature sensor cable is 13 ft 3 in (4 m) in
length, however the user can extend the cable up to
328 ft (100 m) by splicing a length of 300 volt, 18 AWG

(0.75mm

2

) cable.

Cold water in

mixing

valve

Tempered water out

Hot water out

Hot water in

HWAT-Y2
HWAT-R2

Water
heater

A

B

Temperature
sensor

Insulation

180°

Heating
cable

Figure 10: Positioning temperature sensor (optional)

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Alarm wiring (optional)

The alarm contact (24 Vac, 24 Vdc, 1A) inside the
controller can be used to switch an external device.
The contact is closed during operation and open during
an alarm or during loss of power. In a network, all alarm
contacts should be connected in series.

Alarm,

Sensor,

and BMS

terminals

PL6

Alarm contact

TEMP BMS

B A

NC O NO

Figure 11: Connecting the alarm contact

The alarm terminal (PL6) is located in the upper
right corner of the controller and has the text
“alarm contact” next to it. To connect a wire, use a
screwdriver to push down the orange tab on the side
of the terminal. Put the wire into the hole and release
the orange tab. The wires used for the alarm contact
should be rated for 300 V. See “Chapter 4, Error/

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Alarms and Troubleshooting” for more information
about alarm conditions.

The alarm contact is designed as a fail safe
mode and can be wired for normally open (NO) or
normally closed (NC) operation. The following table
summarizes the relay positions in the different
controller states:

Position NC NO

Power Off Open Closed

Power On Closed Open

Alarm Mode Open Closed

Network

The Master/slave function allows one HWAT-ECO to
control up to eight additional HWAT-ECO controllers.
Connect all HWAT-ECO controllers to each other in
parallel using the A and B inputs on terminal (PL3).
This means that several controllers will have two
wires in one hole. The wire should be a twisted pair
and be rated for 300 V. The total maximum length of

this cable between all controllers is 328 ft (100m).

Be careful not to mix A and B connections. To
connect a wire, use a screwdriver to push down the
orange tab on the side of the terminal. Put the wire
into the hole and release the orange tab.

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MASTER

TEMP BMS

B A

TEMP BMS

B A

SLAVE 1

OPTIONAL BMS

WATER HEATER SENSOR

NETWORK WIRE

TO SLAVE 2

Figure 12: Networking controllers together

The diagram below shows the connection of multiple
controllers (with optional RS-485 connections).

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HWAT

heating

cable

L

L

208/240V

HWAT

heating

cable

Master Slave 1 Slave 2

RS-485 RS-485

Sensor

BMS

Alarm

L

L

208/240V

L

L

208/240V

HWAT

heating

cable

Figure 13: Connecting multiple controllers (with
RS-485)

When multiple controllers
are networked and you are
using BMS and Alarm
functions, you must use a
4-wire conductor.

max. 20 AWG

(0.5 mm

2

)

max. 24 AWG

(0.2 mm2)

Figure 14: Combine alarm and BMS wire in 4-wire
cable

Important: For master/slave combination with
alarm function, the alarms are connected in series by a
RS485 wire. Since the cable gland grommet has only

3holes, you must combine the alarm wire and the BMS

wire in a 4-wire cable.

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Building Management System (BMS) (optional)

See Table 5 on page 39.

The BMS input of the HWAT-ECO is a 0 to 10-Vdc
input. If the controller is programmed to have a
BMS connection, the BMS controls the temperature
setpoint. Using 300-V rated cable, connect the BMS
signal wire to terminal (PL5). Connect the ground
wire to the “–” and the 0-10 V output to the “+”
terminal.

Alarm,

Sensor,

and BMS

terminals

0-10v

ground

BMS

PL3 PL5PL4

PL6

Alarm contact

TEMP BMS

B A

Figure 15: Connecting the BMS

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Figure 16 shows the connection of a single controller
(with optional sensor, BMS and alarm connections).

Master

H WAT

heating

cable

Sensor

BMS

Alarm

L

L

208/240V

RayClic-PC

Figure 16: Single controller connection
(with sensor, BMS, and alarm connections)

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Closing the controller

Position the cover in front of the wall-mounted box.
The separation sheet inside the controller will help
guide the cover and the connector. Push the cover
onto the box. Note that the connector pins will offer
some resistance. Put the screws in place and tighten
to 10 inch-lbs (1.13 N-m).

Figure 17: Closing the controller

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Power supply (green LED)

Power to heating cable (green LED)

Heat-up cycle (green LED) - increased risk of scalding

Pipe temperature alarm (requires installed sensor) (green LED)

Alarm (red LED)

Escape, backspace; NO; or display maintain temperature setpoint

Arrow keys: to change menu selection or position the cursor

Confirm selection, new value or YES

02-11-2012 09:30
Maintain *

A
B
C
D
E

F
G
H

A

B

C

D

E

F

G

H

Figure 18: Controller display

Programming the Controller

3

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3.1 Programming Overview

Display functions

Quickstart
Any key to start

The display has two lines with 16 characters each.
The display shows the following text on start up:

The HWAT-ECO has six buttons:

Up/Down/Left/Right arrows

Escape (ESC) button

Enter button

You can program the HWAT-ECO by simply executing
the Quickstart program which is suitable for normal
operations. In addition, advanced programming can
be used to modify initial settings, set additional
features such as BMS and Network Master, reinitialize
the entire controller, or customize the pre-defined
programs.

Programming the Controller

3

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

3.2 Initializing the Controller

The first time you power up the controller, you
must execute the Quickstart program to set the
initial settings. Once initialized continue to power
the controller for at least 6 hours to charge the
internal battery.

TABLE 1:

QUICKSTART MENU

Time and date Year

Month
Day
Hour
Minutes

Select Year
Select Month
Select Day
Select Hour
Select Minutes

Cable type HWAT-R2

“Press Enter for this cable type.”

HWAT-Y2

“Press Enter for this cable type.”

Voltage select 208 Vac

“Press Enter for this voltage
type.”

240 Vac

“Press Enter for this voltage
type.”

Units English

“Press Enter for this unit type.”

Metric

“Press Enter for this unit type.”

Ambient temp.
Maintain temp.
Economy temp.

“Enter ambient temp.”
“Enter maintain temp. setpoint”
“Enter economy temp. setpoint”

Programming the Controller

3

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TABLE 1:

QUICKSTART MENU

Default program Constant

Apartments
Family home
Prison
Hospital
Nursing home
Hotel
Sports center
Convales. home

“Scroll to program and press
Enter.”

During the Quickstart you can press the ESC button
to go back to a previous menu. On startup the
display will show the following text:

Quickstart
Any key to start

Press a key to start, and the following menus
appear:

Time and Date

Use the up/down arrows to select the year and press
Enter. Then, select and enter the month, day, hour, and
minutes. The time and date is contained in volatile
memory, and is maintained during power outages by
an internal rechargeable battery. Power the HWAT-ECO
for at least 6 hours to charge the battery.

Programming the Controller

3

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

Cable type

Use the up/down arrows to select HWAT-Y2 or
HWAT-R2 cable used in your installation. Press Enter.

Voltage

Use the up/down arrows to select 208 V or 240 V
(applied voltage to the cable). Press Enter.

Units

Use the up/down arrows to select English or Metric
units. Press Enter.

Ambient temperature

The ambient temperature is the air temperature
surrounding the hot water piping where the heating
cable is installed. Use the up/down arrow keys to

select from 60˚F (15˚C) to 80˚F (25˚C). Press Enter.

If your design requires that the ambient temperature
is significantly different from one location to another,
you will need an HWAT-ECO controller for each
ambient condition.

Maintain temperature

The maintain temperature setpoint is the water
temperature that you set for normal use. Use the up/
down arrow keys to select the temperature.

Programming the Controller

3

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The minimum temperature is 105˚F (40˚C) or the

economy temperature, whichever is higher. The
maximum temperature depends on cable type,
voltage and ambient temperature. The programmed
maintain temperature will display if you press the
ESC button once the system is in operation.

TABLE 2:

MAXIMUM MAINTAIN TEMPERATURE (208-VOLT)

Ambient temperature

Heating cable







HWAT-Y2 120˚F (49˚C) 125˚F (52˚C) 125˚F (52˚C)

HWAT-R2 140˚F (60˚C) 140˚F (60˚C) 140˚F (60˚C)

TABLE 3:

MAXIMUM MAINTAIN TEMPERATURE (240-VOLT)

Ambient temperature

Heating cable







HWAT-Y2 120˚F (49˚C) 125˚F (52˚C) 125˚F (52˚C)

HWAT-R2 140˚F (60˚C) 140˚F (60˚C) 140˚F (60˚C)

Economy temperature

The economy temperature setpoint is the water
temperature for periods during which hot water is not
usually used (at night) or when a lot of hot water is
used (peak period). Use the up/down arrows to select

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

the temperature. The minimum temperature is 105˚F
(40˚C) and the maximum temperature is the selected

maintain temperature.

Default programs

The HWAT-ECO has 9 pre-defined programs.

(See “Chapter 5, Pre-Defined Programs” for more

information.) Use the up/down arrows to select a
pre-defined program. Press Enter. HWAT-ECO takes a
few seconds to copy the pre-defined program to the
internal memory. During this time a row of dots will
show in the display.

Pipe temperature

This function also ensures that the delivered water
temperature is not lower than the desired maintain
temperature.

Completing initialization

The controller will start automatically when you
finish selecting your Quickstart options. Additional
settings are available in the Setup menu for advanced
installations. See section 3.3 on page 33 for more
information.

Press Enter to start the controller. If you press the
ESC button, you can retrace all menu items to check
the settings. After starting the controller the display
shows date, time, temperature setting and a “*” to

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

indicate that the controller is unlocked. If you wish
to lock (password protect) the controller, see section

3.3.2.6 for instructions.

Displaying Maintain Temperature Setpoint

After finishing the Quickstart, the display will show
the date, time, temperature mode and a star to
indicate that the controller is unlocked.

02-11-2013
Maintain

09:13

While in operating mode, press ESC to view a bar
graph that shows the maintain temperature setpoint.
To enter the programming menu, press any other
key. The controller will exit the menu automatically
after five seconds of key inactivity.

Figure 19: Bar graph

Displaying Pipe Temperature

When the optional pipe temperature sensor is
connected, the controller will display date and time
as above and alternate between temperature mode
and pipe temperature.

Programming the Controller

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

02-11-2013

Pipe T: 110°F

09:13

*

3.3 Advanced Programming

Advanced programming options are also available.
Table 4 and the remainder of this section outline the
advanced programming options that include modifying
initial settings, setting additional features such as BMS
and Network Master, reinitializing the entire controller,
or customizing the pre-defined programs.

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

TABLE 4:

ADVANCED PROGRAMMING MENU

1 Time and
Date

1 Year
2 Month
3 Day
4 Hour



Select Year
Select Month
Select Day
Select Hour
Select Minutes

2 Setup

(enter pass­word if Lock
is ON)

1 Main Temp “Enter maintain temp. setpoint”

2 Economy Temp “Enter economy temp. setpoint”

3 Ambient Temp “Enter ambient temp.”

4 Power Correction Selectable

 Lock/unlock Setup and Timer

menus

6 BMS Select Yes/No

7 Network Master Select Yes/No

8 Reinitialize Select Yes/No

9 Short heater Select Yes/No

10 LTA
(Low Temp Alarm)

1. Set Status

2. Set Temperature

3. Set Alarm Filter Time

4. Set Deadband

Select Yes/No
Enabled or Disabled

95°F (35°C) min
5-30 Minutes
4-18°F (2-10°C)

11 HTC
(High Tem. Cut Out)

1. Set Status

2. Set Temperature

3. Set Alarm Filter Time

4. Set Deadband

Enabled or Disabled

Maximum 205°F

10-30 Minutes

4-18°F (2-10°C)

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

TABLE 4:

ADVANCED PROGRAMMING MENU

3 Timer

(enter pass­word if Lock
is ON)

1 Default program Constant

Apartments

Family home

Prison
Hospital
Nursing home
Hotel
Sports Center
Convalesc. home

2. Edit program
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

Edit timer for Monday
Edit timer for Tuesday
Edit timer for Wednesday
Edit timer for Thursday

Edit timer for Friday

Edit timer for Saturday
Edit timer for Sunday

4 Holiday On

Off
xxDays off

 Show firmware version number + Cable type + Sensor temp.

Time and Date

Use the up/down arrows to select the year and press
Enter. Then select and set the month, day, hour and
minutes.

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

Setup

When Lock is on (no star in the lower right corner)
enter a password to access the setup menu. The
controller locks again after 60 seconds of inactivity.

When Lock is off the following menus are directly
accessible.

1. Maintain temperature

The maintain temperature setpoint is the water
temperature that you set for normal use. Use the
up/down arrows to select the temperature. The

minimum temperature is 105˚F (40˚C) or the economy

temperature, whichever is higher. The maximum
temperature depends on cable type, pipe diameter,
insulation thickness and ambient temperature.

2. Economy temperature

The economy temperature setpoint is the water
temperature for periods during which hot water is
not usually used (at night) or when a lot of hot water
is used (peak period). Use the up/down arrows to
select the temperature. The minimum temperature

is 105˚F (40˚C) and the maximum temperature is the

selected maintain temperature. Press Enter.

3. Ambient temperature

The ambient temperature is the air temperature
surrounding the pipes where the heating cable is

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

installed. Use the up/down arrows to select from

60˚F (15˚C) to 80˚F (25˚C). Press Enter to confirm.

If your design requires that the ambient temperature is
significantly different from one location to another, you
will need an HWAT-ECO controller for each ambient
condition.

4. Power correction

The power correction factor can be selected to
increase or decrease your actual pipe maintain
temperature or to adjust for using HWAT heating
cables on rigid plastic pipes.

The power correction factor can be adjusted from

0.6 to 1.40, increasing or decreasing the percent
time the heating cable is powered during the duty
cycle.

For installation on rigid plastic pipe set the power

factor at:

HWAT-Y2: 1.20

HWAT-R2: 1.25

 Lock (password)

Use the up/down arrows to select Lock On/Off and
press Enter. If you select ‘On’, you must enter a
password using the left/right and up/down arrow
buttons to select a 4-digit password. Press Enter.

You will need to remember your 4-digit password
whenever you wish to unlock the controller for

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

reprogramming. Once you unlock and reprogram,
you will need to relock by entering your password.

If Lock is On, the Setup and Timer menus are protected
by the password. After you enter the password, the
controller remains unlocked until five minutes of key
inactivity or until you select Lock ‘On’ again.

6. Building Management System (BMS)

You can activate the Building Management System
option using this menu. When set to “Yes” the
controller responds only to the voltage applied to the

BMS terminal. For voltages ≤ 4 Vdc: heating cable
is OFF. For voltages between 4.1 Vdc and 6.4 Vdc:

maintain temperatures are set as indicated in Table

5. For voltages > 6.4 Vdc: 100% power is applied

to the heating cable. See "Building Management
System (BMS) (optional)" on page 22 for
installation information. If Water heater is ON, it
overrules the BMS temperature setting if necessary.

Programming the Controller

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

BMS VOLTAGE INPUT

Temp °F (°C)

HWAT-Y2

HWAT-R2

U-BMS/U-GLT
(VOLT)

>147 (>64) X >6.4
147 (64) X 6.4
140 (60) X 6

131 (55) X X 5.5
122 (50) X X 5
113 (45) X X

4.5

106 (41) X X

4.1

Off X X

0

7. Network Master

In large installations where more than one
HWAT-ECO controllers are connected to each other,
you must select one controller as the Master. This
controller should be fully programmed and all slave
controllers will use the Master settings.

The master controller sends commands to all slave

controllers to switch them ON or OFF. The master

program is used for all controllers as follows:
Slave controllers on the same phase (max. three

controllers) will have a delayed ON and OFF. This

way the start-up current of the cable will never occur
at the same moment for these controllers (A, B and
C). Slave controllers connected to a different phase
will switch at the same time (1, 2 and 3).

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

After selecting “Master: Yes”, the slave controllers
will initialize and show:

:Slave: “x y” x= phase number (1 to 3)
y= slave identification (A, B and C)

The master controller is always 1 A, the slave
controllers will get their number and identification
automatically. Always check afterwards if all
controllers have unique id-numbers, if not, check

the RS485 cables and repeat this procedure.

8. Reinitialize

To Reinitialize all settings back to the factory
settings (except time and date), set the “Reinitialize”
menu to “Yes.”

9. Short Heater

This feature allows you to activate a low current
alarm:

Yes: Allows low current such as when used as a
demonstration, or to control a contactor. In this
mode there is no low current alarm.

No: Generates low current alarm when measured
current is less that 300 mA.

10. LTA (Low Pipe Temperature Alarm)

When the optional pipe temperature sensor option
is installed, the HWAT-ECO controller monitors the
temperature of the hot water distribution pipes

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

where the sensor is installed and can generate a low
pipe temperature alarm.

1. Set Status: Enabled or Disabled

2. Set temperature:
– Minimum: 95°F (35°C)
– Maximum: < Maintain (or Economy)

3. Set Alarm filter time: 5–30 minutes

4. Set deadband: 4–18°F (2–10°C), 9°F

(5°C default)

11. HTC (High Temperature Cut-Out)

When the optional pipe temperature sensor option
is installed, the HWAT-ECO controller monitors the
temperature of the hot water distribution pipes
where the sensor is installed and a high temperature
cut-out can be set.

High Temperature Cut-out:

Minimum: > set point
Maximum: 205°F (96°C)
Alarm filter: 5–30 minutes (default 10)
Dead band: > 5°F (3°C) default 0°F(6°C)

Timer

The Timer feature lets you re-program any of the
pre-defined programs to suit your personnel
requirements. Reprogramming is done graphically in
½ hour time blocks. A block can be set to Heat-Up

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

cycle, Maintain temperature, Economy temperature,
or Off. See “Chapter 6, Heat-Up Cycle Graphs” for
more information.

Edit pre-defined programs

To edit a program, switch Lock to Off. If password
protected, you will need to enter the password to
unlock the controller. After you enter the password,
the controller remains unlocked until five minutes of
key inactivity or the Lock ‘On’ is selected again

Select temperature

Use the up/down arrows to select the temperature:

= Maintain temperature= Heat-up cycle

= Economy temperature = Off

Figure 20: Timer block options

Select time block

Use the left/right arrows to select the time block.
Timer programming example from 00:00 to 08:00:

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

.......... 04:00 – 04:30: Off

00:00 – 00:30: Heat-up cycle 04:30 – 05:00: Economy
00:30 – 01:00: Heat-up cycle 05:00 – 05:30: Economy
01:00 – 01:30: Heat-up cycle 05:30 – 06:00: Economy
01:30 – 02:00: Heat-up cycle 06:00 – 06:30: Economy
02:00 – 02:30: Off 06:30 – 07:00: Maintain
02:30 – 03:00: Off 07:00 – 07:30: Maintain
03:00 – 03:30: Off 07:30 – 08:00: Maintain

03:30 – 04:00: Off ...........

Figure 21: Timer programming example

Heat-Up cycle

The HWAT-ECO can be programmed to power
HWAT-Y2 or HWAT-R2 at full power for any selected
number of hours. When hot water is not being used
and the pipes are stagnant, the HWAT-ECO can
raise the temperature of the water in the stagnant
pipes. To determine the amount of time that is
required to reach a desired temperature, refer to
“Chapter 6, Heat-Up Cycle Graphs.” You must know
the programmed maintain temperature, pipe sizes,
system voltage and the type of heating cable to
determine the amount of time that is required
to reach a desired temperature. If the desired
temperature can be reached in a timeframe that is
less than when the pipes will be flowing again, the
Heat-Up cycle can be programmed for the number of
hours that are required and the desired temperature
will be reached. To determine the amount of time

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

that is required to return back to the maintain
temperature after the Heat-Up cycle is complete
and the heating cable is off, refer to “Chapter 7,
Cool-Down Graph.”

Holiday

This menu is used to set the controller to Off,
timed-off, or to resume your timer program.

On: The controller uses the normal operation the
timer program.

Off: The controller will not power the system until
you select “Use timer”.

xx Days off: You can select a number of days. The
controller automatically returns to timer mode when
the selected number of days have passed.

Info

The display shows the firmware version number,
selected cable type and the current sensor
temperature. Press Enter twice to update the
sensor temperature on the display.

Error/Alarms and

Troubleshooting

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

Please ensure that the unit is correctly connected to
the power supply and the heating cable is connected
to the HWAT-ECO unit.

Error code
Definitions

Cause/reasons

Remedy

Error 1: Internal temperature

alarm;

Temperature is too
high. (> 65°C)

Turn off power and allow the
controller to cool and then
re-energize. The controller
will lock out after three
occurrences. If this does not
restore the controller, replace
the HWAT-ECO.

Error 2: Pipe Sensor failure

(Only when
temperature alarm
“enabled” selected)

• Sensor or sensor
cable defect

• Low temp alarm or
High temperature
cut-out selected
and sensor is not
installed.

Connect sensor to HWAT-ECO or
turn off temperature alarm.

Check sensor connections;
replace sensor, check
temperature sensor mounting

Error 3: Network failure

Two or more
HWAT-ECO’s are set as
Master

Reinitialize MASTER
(see "Setup" on page 36)

Error/Alarms and

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Error code
Definitions

Cause/reasons

Remedy

Error 4: Internal Error Controller needs to be replaced.

Contact nVent representative

Error 5: No/Low current alarm Ensure that the heating circuit

is connected to power output of
the HWAT-ECO.

If controlling a contactor, ensure
that the Short Heater Alarm is
enabled.

Error 6: Configuration Error Refer to "Short Heater" menu.

• If heating cable is longer
that 15 ft. (4.5 m) then, Short
heater = No

• If heating cable is shorter
than 15 ft. (4.5 m) then, Short
heater = Yes

Error 7: Pipe temperature too

high

(Only when HTC is
enabled)

• Boiler temperature is
too high.

• Pipe temperature
too hot

• Verify High Temperature
Cut-out (HTC) is set correctly.

• Correct boiler or mixing valve
setting.

• Verify HWAT-ECO
programming.

• Verify that pipe insulation
schedule is correct.

Error/Alarms and

Troubleshooting

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

Error code
Definitions

Cause/reasons

Remedy

Error 8: Time is lost

Battery is drained due
to not being powered
for a long time.

Input time again (will be asked
by the unit when a button is
pressed)

Error 9: Pipe temperature is

too low

(Only when temperature
alarm “yes” selected)

Pipe temperature too
low

• Correct boiler/mixing valve
temperature setting

• Ensure that the sensor is tight
to pipe and insulated.

• Verify power is connected to
heating cable.

• Confirm Low Temperature
Alarm (LTA) setting

Confirm HWAT-ECO settings
Confirm insulation schedule

Error/Alarms and

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

Indications/Trouble
shooting

Cause/reasons

Remedy

Water temperature
too low

Too low water
temperature

• Boiler temperature is
too low

• Cold water entering
system

• Heater used is
different type than
entered in program.

• Entered value of
ambient temperature
is too high.

• Insulation thickness
is different than stan­dard thickness.

• Check boiler
temperature and
timer program

• Mixing valves and
janitor sinks may be
allowing cold water to
cross over to the hot
water side.

• Change heater type
in HWAT-ECO (can
only be done in
quick install "Setup"
on page 36

- Reinitialize)

• Change value of
ambient temperature

• Adjust power
correction factor if
possible (see "Timer"
on page 41)

• Change insulation
to match required
schedule in HWAT
installation manual.

Error/Alarms and

Troubleshooting

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

Indications/Trouble
shooting

Cause/reasons

Remedy

Water temperature
too high

Too high water
temperature

• Heater used is
different type than
entered in program.

• Insulation thickness
is different than stan­dard thickness.

• Entered value of
ambient temperature
is too low

• Change heater type
in HWAT-ECO (can
only be done in
quick install "Setup"
on page 36

- Reinitialize)

• Adjust power
correction factor if
possible (see "Timer"

on page41)

• Change value of
ambient temperature

No display

Loss of power Restore power

Can’t access
programming
mode

Controller is
password-protected

Enter your 4-digit
password. If you
forgot your password,
enter the backup
password: 6922 to
unlock the controller

50 | nVent.com

5

Pre-Defined Programs

Constant

I-0

Monday-Sunday

Apartments

I-1

Monday-Friday

Saturday-Sunday

Family home

I-2

Monday-Sunday

Prison

I-3

Monday-Sunday

I-4

Monday-Sunday

I-5

Monday-Sunday

I-6

Monday-Sunday

I-7

Monday-Sunday

I-8

Monday-Sunday

00

02 04 16

00

02 04 16

00

02 04 16

00

06

12

18

24

02 04 16

14

1008

20 22

00

06

12

18

24

02 04 16

14

1008

20 22

00

06

12

18

24

02 04 16

14

1008

20 22

Heat-up

Economy

Maintain

Heat-up

Economy

Maintain

Heat-up

Economy

Maintain

00

06

12

18

24

02 04 16

14

1008

20 22

Heat-up

Economy

Maintain

00

06

12

18

24

02 04 16

14

1008

20 22

Heat-up

Off

Economy

Maintain

= Maintain temperature= Heat-up cycle

= Economy temperature = Off

= Economy temperature = Off

Heat-up

Economy

Maintain

Heat-up

Economy

Maintain

Heat-up

Economy

Maintain

00

02 04 16

Heat-up

Economy

Maintain

00

02 04 16

Heat-up

Economy

Maintain

Off

Off

Off

Off

Off

Off

Off

Off

Off

Raychem-IM-H57340-HWATECOcontroller-EN_1805

nVent.com | 51

5

Pre-Defined Programs

Hospital

I-4

Monday-Sunday

Nursing home

I-5

Monday-Sunday

Hotel

I-6

Monday-Sunday

Sports center

I-7

Monday-Sunday

Convalescent home

I-8

Monday-Sunday

00

06

12

18

24

02 04 16

14

1008

20 22

00

06

12

18

24

02 04 16

14

1008

20 22

00

06

12

18

24

02 04 16

14

1008

20 22

= Maintain temperature= Heat-up cycle

= Economy temperature = Off

Heat-up

Economy

Maintain

Heat-up

Economy

Maintain

Heat-up

Economy

Maintain

00

06

12

18

24

02 04 16

14

1008

20 22

Heat-up

Economy

Maintain

00

06

12

18

24

02 04 16

14

1008

20 22

Heat-up

Economy

Maintain

Off

Off

Off

Off

Off

Raychem-IM-H57340-HWATECOcontroller-EN_1805

Heat-Up Cycle Graphs

6

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

To calculate heat-up and cooldown times when heat cycle is
used.

Heat-Up HWAT-Y2

125
(52)

120
(49)

115
(46)

110

(43)

Time (hours)

Pipe Temperature °F (°C)

105
(41)

0 2 4 6 8 10 12 14 16 18 22 2420

70°F (21°C) ambient

1/2-inch pipe

1-inch pipe

2-inch pipe

208V

0 2 4 6 8 10 12 14 16 18 22 2420

Time (hours)

125
(52)

120
(49)

115
(46)

110

(43)

Pipe Temperature °F (°C)

105
(41)

240V

1/2-inch pipe

1-inch pipe

2-inch pipe

70°F (21°C) ambient

Heat-Up Cycle Graphs

6

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Raychem-IM-H57340-HWATECOcontroller-EN-1805

Heat-Up HWAT-R2

0 2 4 6 8 10 12 14 16 18 22 2420

Time (hours)

150

(66)

140

(60)

130

(54)

120

(49)

110

(43)

Pipe Temperature °F (°C)

105

(41)

240V

1/2-inch pipe

1-inch pipe

2-inch pipe

70°F (21°C) ambient

150

(66)

140

(60)

130

(54)

120

(49)

110

(43)

105

(41)

Time (hours)

Pipe Temperature °F (°C)

0 2 4 6 8 10 12 14 16 18 22 2420

70°F (21°C) ambient

1/2-inch pipe

1-inch pipe

2-inch pipe

208V

7

Cool-Down Graph

54 | nVent.com

Raychem-IM-H59181-HWATECO16controller-EN-1805

These cool down curves represent when the heating
cable is turned off.

0 1 2 3 4 5 6 7 8 9 11 1210

Time (hours)

Cool-Down

150
(66)

140
(60)

130
(54)

120
(49)

110
(43)

145
(63)

135
(57)

125
(52)

115
(46)

105
(40)

Pipe Temperature °F (°C)

1/2-inch pipe

1-inch pipe

2-inch pipe

70°F (21°C) ambient

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