Laars NEOTHERM NTH Manuel utilisateur

Installation and

Operation Instructions for

Modulating Boilers and

Volume Water Heaters

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,

qualied in hot water boiler and heater installation and maintenance. Improper installation and/or operation

could create carbon monoxide gas in ue gases which could cause serious injury, property damage, or

death. Improper installation and/or operation will void the warranty.

WARNING

If the information in this manual is not

followed exactly, a re or explosion may result

causing property damage, personal injury or

loss of life.

Do not store or use gasoline or other

ammable vapors and liquids in the vicinity of

this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not

use any phone in your building.

• Immediately call your gas supplier from a

nearby phone. Follow the gas supplier's

instructions.

• If you cannot reach your gas supplier, call

the re department.

Installation and service must be performed by

a qualied installer, service agency, or gas supplier.

AVERTISSEMENT

Assurez-vous de bien suivres les instructions

données dans cette notice pour réduire au

minimum le risque d’incendie ou d’explosion

ou pour éviter tout dommage matériel, toute

blessure ou la mort.

Ne pas entreposer ni utiliser d’essence ni d’autres

vapeurs ou liquides inammables dans le voisinage

de cet appareil ou de tout autre appareil.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:

• Ne pas tenter d’allumer d’appareils.

• Ne touchez à aucun interrupteur. Ne pas vous servir des

téléphones dansle bâtiment où vous êtes.

• Appelez immédiatement votre fournisseur de

gaz depuis un voisin. Suivez les instructions du

fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de gaz,

appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par un

installateur ou un service d’entretien qualié ou par le

fournisseur de gaz.

with Touchscreen

Indoor and Outdoor

NTH Sizes 399 – 850 MBTU/h

NTV Sizes 150 – 850 MBTU/h

H2374100J

Installation and Operation Instructions Document 1330J

Table of Contents

LAARS Heating Systems

SECTION 1

GENERAL INFORMATION

1.A Introduction ....................................................... 5

1.B Warranty ........................................................... 5

1.C Model Identication ........................................... 5

1.D Safety Notes ..................................................... 6

1.E Model Overview ............................................... 8

1.F Dimensions, Indoor Models ............................ 14

1.G Dimensions, Outdoor Models ......................... 16

1.H The Installation Kit (installation parts box). .... 18

SECTION 2

LOCATING THE UNIT

2.A General Information ........................................ 20

2.B Locating Appliance for Correct Vent Distance

from Outside Wall or Roof Termination ........... 20

SECTION 3

VENTING AND COMBUSTION AIR

3.A General Venting .............................................. 21

3.B Combustion Air ............................................... 21

3.C Venting ............................................................ 24

3.D Common Venting ............................................ 26

3.E Locating Vent and Combustion Air Terminals . 26

3.F Common Vent Test ......................................... 30

SECTION 4

GAS SUPPLY AND PIPING

............................. 31

SECTION 5

PUMP REQUIREMENTS

5.A Boiler Flow and Head Requirements - Boiler . 32

5.B Water Heater Flow and

Head Requirements - Heater .......................... 32

SECTION 6

WATER CONNECTIONS

6.A Boiler.....................................................34

6.A.1 Boiler Water Piping ........................................ 34

6.A.2 Boiler Cold Water Make-Up ............................ 34

6.A.3 Condensate Drain ........................................... 35

6.A.4 Freeze Protection ........................................... 35

6.A.5 Boiler Suggested Piping Schematics .............. 35

6.A.6 Recognized Chemicals ................................... 36

6.B Water Heater.........................................42

6.B.1 Heater Water Quality ...................................... 42

6.B.2 Piping Requirements ...................................... 42

6.B.3 Cold Water Make-Up ...................................... 42

6.B.4 Condensate Drain ........................................... 42

6.B.5 Freeze Protection ........................................... 42

6.B.6 Heater Suggested Piping Schematics ............ 42

6.B.7 Heater Suggested Pumps .............................. 43

SECTION 7

INSTALLATION AND WIRING

7.A Installation Warnings ...................................... 45

7.B Main Power Connections ................................ 45

7.B.1 Pump Connections and Operation ................. 45

7.B.2 Vari-Prime (optional variable speed pump control) ..... 46

7.C Hydronic Heating Using

External Modulation Control .......................... 46

7.D Optional Field Connections ............................ 46

7.E Lead Lag Connections .................................... 48

7.F Building Automation System Connections ...... 49

7.G System Wiring Diagram .................................. 51

7.H Ladder Diagram .............................................. 52

NEOTHERM Commercial Boilers and Water Heaters

SECTION 11

TROUBLESHOOTING

11.A About Lockouts, Holds, and Alerts ................... 84

11.A.1 Responding to a Lockout, Hold, or Alert ...... 84

11.A.2 Viewing the Lockout and Alert Histories ....... 84

11.B Troubleshooting Table ...............................86 - 94

11.C Diagnostic Tests and Input/Output Indicators .. 94

11.D Lead Lag Follower Diagnostics ........................ 95

11.E Statistics ........................................................... 95

11.F Analysis ............................................................ 95

11.G Control Snapshot ............................................. 95

11.H Operating Sequence ........................................ 96

SECTION 12

REPLACEMENT PARTS

12.A General Information ....................................... 96

12.B Parts List ...................................................96-99

12.C Parts Illustrations ....................................99-106

SECTION 8

USING THE TOUCH SCREEN

8.A The Touch Screen .......................................... 53

8.B Using the Touch Screen ................................. 53

8.C Login (required for some parameters) ............ 54

8.D Verication Process for

Safety-Related Parameters ............................ 55

8.E Checking Individual Parameters ..................... 56

8.F Setting the Date and Time .............................. 57

8.G The Conguration Menu......................58

8.G.1 System Identication & Access ....................... 59

8.G.2 Heat Conguration .......................................... 59

8.G.2.a CH - Central Heat Conguration ................... 59

8.G.2.b Setting Up 4-20 mA Setpoint ........................ 59

8.G.3 Outdoor Reset Conguration .......................... 60

8.G.4 DHW - Domestic Hot Water Cong ................ 60

8.G.5 Warm Weather Shutdown Cong ................... 60

8.G.6 Demand Priority Conguration ....................... 61

8.G.7 Modulation Conguration ................................ 61

8.G.8 Pump Connections ......................................... 61

8.G.9 Statistics Conguration ................................... 62

8.G.10 High Limits ...................................................... 62

8.G.11 Stack Limits .................................................... 62

8.G.12 Anti-Condensation Conguration ................... 62

8.G.13 Frost Protection .............................................. 62

8.G.14 System Conguration ..................................... 62

8.G.15 Fan Conguration ........................................... 63

8.G.16 Sensor Conguration ...................................... 63

8.G.17 Lead Lag Follower Conguration .................... 64

8.G.18 Lead Lag Leader Conguration ...................... 66

8.G.18.a About Lead Lag Operation ........................ 69

8.H Congure for a

Building Automation System ........................... 71

8.I Combustion Setup .......................................... 72

8.J Adjusting CO2 ................................................ 74

SECTION 9

FIRST START UP AND ADJUSTMENT

9.A Filling the Boiler System ................................. 77

9.B First Operation ................................................ 78

9.C Shutting Down the Unit ................................... 78

9.D Restarting the Unit .......................................... 78

SECTION 10

MAINTENANCE

10.A System Maintenance ..................................... 79

10.B Appliance Maintenance

and Component Description ........................... 79

10.C Battery Backup for Date & Time ..................... 82

10.D Gas Conversion .............................................. 83

LAARS Heating Systems

Page 5

Model Nomenclature

SECTION 1

GENERAL INFORMATION

1.A Introduction

1.B Warranty

1.C Model Identication

NEOTHERM Commercial Boilers and Water Heaters

NOTE: Throughout the content of this manual,

the NeoTherm will be referred to as a ‘unit’.

unit = NeoTherm

LAARS Heating Systems NeoTherms are covered by a

limited warranty. The owner should complete the warranty

registration at www.Laars.com.

All warranty claims must be made to an authorized

LAARS Heating Systems representative. Claims must

include the serial number and model (this information

can be found on the rating plate), installation date, and

name of the installer. Shipping costs are not included in

the warranty coverage.

This manual provides information necessary for the

installation, operation, and maintenance of LAARS

Heating Systems NeoTherm boilers and water heaters.

Read it carefully before starting the installation.

All application and installation procedures should

be reviewed completely before proceeding with the

installation. Consult the LAARS Heating Systems

factory, or local factory representative, with any

problems or questions regarding this equipment.

Experience has shown that most operating problems

are caused by improper installation.

NeoTherm is protected against over pressurization. A

pressure relief valve is included with each NeoTherm.

Some NeoTherms may require that the PRV be

installed prior to lling the system. Refer to Figures 2-9

for PRV locations.

Consult the Rating Plate on the side of the unit. The

following information describes the Model Identication

(Model Nomenclature).

(1-2) Model Series Designation

N T = NeoTherm

(3) Usage

H = Hydronic

V = Volume Water

(4-6) Size

1 5 0 = 150,000 BTU/hr input, NTV only

1 9 9 = 199,000 BTU/hr input, NTV only

2 8 5 = 285,000 BTU/hr input, NTV only

3 9 9 = 399,000 BTU/hr input

5 0 0 = 500,000 BTU/hr input

6 0 0 = 600,000 BTU/hr input

7 5 0 = 750,000 BTU/hr input

8 5 0 = 850,000 BTU/hr input

(7) Fuel

N = Natural Gas

P = LP Gas

(8) Options Code

X = Standard US

J = CSD-1, FM, GAP, (U.S. size 500-850 only)

C = Standard Canada

D = CSD-1 (Canada 500-800 only)

E = OUTDOOR (U.S.)

F = OUTDOOR (Canada NTH 399-850 only)

G = CSD-1, OUTDOOR (U.S. 500-850 only)

H = CSD-1, OUTDOOR (Canada 500-850 only)

(9) Pump Options

N = Pump included (N/A for outdoor NTV 750 & 850)

X = No pump

W= HLW w/ Pump (NTV only)

L = HLW w/out Pump (NTV only)

(10) Revision

3 = Third version

12 3 456 7 8 9 10

NT 3

N T N - Natural Indoor Units X - No pump 3 - Third

1 5 0 P - Propane X - Standard U.S. N - Pump included

1 9 9 C - Standard Canada (N/A for outdoor

H - Hydronic 2 8 5 J - CSD-1 (U.S. 500-850 only) NTV 750 & 850)

Boiler 3 9 9 D - CSD-1 (Can 500-850 only) L - Opt. HLW no pump

V - Volume 5 0 0 Outdoor Units (NTV only)

Water 6 0 0 E - Standard U.S. W - Opt. HLW w/ pump

7 5 0 F - Standard Canada (NTV only)

8 5 0 G - CSD-1 (U.S. 500-850 only) (N/A for outdoor

H - CSD-1 (Can 500-850 only) NTV 750 & 850)

OPTIONS REVISIONPUMP OPTIONSSERIES

USAGE

SIZE

MBTU/h FUEL

Page 6

1.D Safety Notes

WARNING

Carbon Monoxide Hazard

Improper adjustment of the burners may lead to poor

combustion quality, increasing the amount of carbon

monoxide produced. Excessive carbon monoxide

levels may lead to personal injury or death.

WARNING

This unit must be installed in accordance with the

procedures detailed in this manual, or the manufacturers

warranty will be voided. The installation must conform

to the requirements of the local jurisdiction having

authority, and, in the United States, to the latest edition

of the National Fuel Gas Code, ANSI Z223.1/NFPA54.

In Canada, the installation must conform to the latest

edition of CSA B149.1 Natural Gas and Propane Gas

Installation Code, and/or local codes. Where required

by the authority having jurisdiction, the installation of

these units must conform to the Standard for Controls

and Safety Devices forAutomatically Fired Boilers,

ANSI/ASME CSD-1. Any modi cations to the boiler, its

gas controls, or wiring may void the warranty. If  eld

conditions require modi cations, consult the factory

representative before initiating such modi cations.

WARNING

• Water temperature over 125°F (52°C) can cause

severe burns instantly or death from scalds.

• Children, disabled and

elderly are at highest

risk of being scalded.

• See instruction manual

before setting temperature

at the unit.

• Feel water before bathing

or showering.

• If this unit is used

to produce water that could scald if too hot, such

as domestic hot water use, adjust the outlet control

(limit) or use temperature limiting valves to obtain a

maximum water temperature of 125°F (52°C).

WARNING

Fire or Explosion Hazard

Improper con guration can cause fuel buildup and

explosion. Improper user operation may result in

property loss, severe physical injury, or death.

Any changes to safety-related con guration

parameters must only be done by experienced and/or

licensed burner/boiler operators and mechanics.

If any odor of gas is detected, or if the gas burner does

not appear to be functioning in a normal manner, close

the main gas shuto󰀨 valve. Do not shut o󰀨 the power

switch. Contact your heating contractor, gas company,

or factory representative.

NOTE: This unit is protected against hydronic

over-pressurization. A pressure relief valve is included

with each unit.

WARNING Indicates an imminently hazardous situation which, if not

avoided, can or will result in death or serious injury and can

or will result in catastrophic property damage.

CAUTION Indicates a potentially hazardous situation which, if not avoided,

may result in moderate injury and/or property damage.

NOTE: Indicates instructions that are important to that topic but not

related to personal injury or property damage.

Safety Notes are used throughout this manual to bring attention to the presence of hazards with various risk

levels and to o󰀨 er important information concerning the life of this product. There are 3 basic types.

WARNING

CANCER AND REPRODUCTIVE HARM.

WWW.P65WARNINGS.CA.GOV.

AS REQUIRED BY THE STATE OF

CALIFORNIA PROPOSITION 65.

LAARS Heating Systems

Page 7

WARNING

Electrical Shock Hazard

Electrical shock can cause severe injury, death or

property damage. Disconnect the power supply before

beginning installation or changing the wiring to prevent

electrical shock or damage to the equipment. It may be

necessary to turn o󰀨 more than one power supply

to disconnect.

All electrical wiring is to be done in accordance with

local codes, or in the absence of local codes, with: 1)

The National Electrical Code ANSI/NFPA No. 70 - latest

Edition, or 2) CSA STD. C22.1 “Canadian Electrical Code

- Part 1.” This appliance must be electrically grounded in

accordance with these codes.

WARNING

The Repair Parts list designates parts that contain

refractory ceramic  bers (RCF). RCF has been classi ed

as a possible human carcinogen. When exposed to

temperatures above 180ºF, such as during direct  ame

contact, RCF changes into crystalline silica, a known

carcinogen. When disturbed as a result of servicing or

repair, these substances become airborne and, if inhaled,

may be hazardous to your health.

Do not remove or replace RCF parts or attempt any

service or repair work involving RCF without wearing

the following protective gear:

1. A National Institute for Occupational Safety and

Health (NIOSH) approved respirator.

2. Long sleeved, loose  tting clothing.

3. Gloves.

4. Eye Protection.

NOTE: All installations must be made in accordance with

1) American National Standard Z223.1/NFPA54-Latest

Edition “National Fuel Gas Code” or

2) CSA B149.1 “Natural Gas and Propane Installation

Code” or in Canada reference the B149.1 latest

edition and with the requirement of the local utility or

other authorities having jurisdiction. Such applicable

requirements take precedence over the general

instructions contained herein. All electrical wiring is to

be done in accordance with the local codes, or in the

absence of local codes, with: 1) The National Electrical

Code ANSI/NFPA No. 70-latest Edition, or

2) CSA STD. C22.1 “Canadian Electrical Code - Part

1”. This appliance must be electrically grounded in

accordance with these codes.

NEOTHERM Commercial Boilers and Water Heaters

Page 8

Figure 1. All models open from the front

DOOR

HANDLE

(PULL TO OPEN)

INDOOR OUTDOOR

(RELEASE BOTH

LATCHES TO

OPEN)

DOOR LATCHES

2 SCREWS

FASTEN FRONT

PANEL INTO

PLACE

ON / OFF

SWITCH

THE TOUCH SCREEN ON

OUTDOOR UNIT IS LOCATED

BEHIND FRONT PANEL

1.E Model Overview

These units are o󰀨ered in both Indoor and Outdoor

models for all sizes.

NOTE: Outdoor Installation of volume water heaters

not permitted in Canada.

The physical appearance of the indoor and outdoor units

is drastically di󰀨erent because the outdoor model o󰀨ers

a fully weathertight enclosure that hides the touchscreen.

Whereas the indoor model is not fully weathertight and

the touchscreen can be accessed without having to open

the unit. See Figure 1 through Figure 9.

Both the indoor and the outdoor models have the

On/O󰀨 switch on the outside of the unit.

Both also have the Rating Plate on the outside panel

to the right. See Figure 8 on page 12

The only component (interior) di󰀨erence between the

indoor and outdoor models is that all of the piping for the

outdoor model, with the exception of the exhaust vent, is

at the BACK of the unit. Figure 9 on page 13

The gas connection, the air inlet, and the water inlet and

outlet are all at the back of the unit. This is consistent for

all sizes.

LAARS Heating Systems

Page 9

Figure 3. Location of Components, Size 285

EXHAUST VENT CONNECTION

AIR INLET CONNECTION

GAS CONNECTION

TOUCHSCREEN

HEAT EXCHANGER

GAS VALVE VENTURI

AIR/ GAS

BLOWER

WATER INLET

WATER OUTLET

PRESSURE RELIEF VALVE

AIR PRESSURE SWITCH

DRAIN VALVE

CONDENSATE TRAP

AIR TRANSITION

ON / OFF SWITCH

Figure 2. Location of Components, Sizes 150-199

EXHAUST VENT CONNECTION

GAS CONNECTION

AIR PRESSURE SWITCH

TOUCHSCREEN

HEAT EXCHANGER GAS VALVE

VENTURI

AIR/ GAS

BLOWER

PRESSURE RELIEF VALVE

WATER INLET

WATER OUTLET

AIR INLET CONNECTION

DRAIN VALVE

CONDENSATE TRAP

AIR TRANSITION

ON / OFF SWITCH

NEOTHERM Commercial Boilers and Water Heaters

Page 10

EXHAUST VENT CONNECTION

GAS CONNECTION

TOUCHSCREEN

HEAT EXCHANGER

MANUAL SHUTOFF

GAS VALVE

VENTURI

AIR/ GAS

BLOWER

PRESSURE RELIEF VALVE

WATER INLET

WATER OUTLET

AIR INLET CONNECTION

DRAIN VALVE

CONDENSATE TRAP

GAS VALVE

ON / OFF SWITCH

Figure 4. Location of Components, Indoor Size 399

Figure 5. Location of Components, Indoor Size 500

EXHAUST VENT CONNECTION

PRESSURE RELIEF VALVE

TOUCHSCREEN

HEAT EXCHANGER

MANUAL SHUTOFF

GAS VALVE

VENTURI

GAS VALVE

WATER INLET

WATER OUTLET

AIR INLET CONNECTION

DRAIN VALVE

CONDENSATE TRAP

GAS CONNECTION

AIR/ GAS BLOWER

GAS PRESSURE

SWITCH

AIR PRESSURE SWITCH

ON / OFF SWITCH

LAARS Heating Systems

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