Laars NeoTherm LC NTH (Sizes 1000-1700 MBTU/h) - Install User Manual download pdf

pg 1 of 6

H2352500B

Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583

Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355

1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130

www.Laars.com Litho in U.S.A. © Laars Heating Systems 1404 Document 7025B

VARI-PRIME

: A variable pump control that, when used with a variable speed pump, maintains a user-chosen temperature rise

between the inlet and outlet of the boiler.

GENERAL PCB OPERATION:

1. The desired Delta T can be set to any of the following values by moving or adding jumpers to the (JP2) terminal on the control:

See Figure 2.

15 deg F/8 deg C 20 deg F/10 deg C 25 deg F/13 deg C 30 deg F/ 16 deg C

By adding a second jumper, one on “15 deg F” and one on “20 deg F”, it is possible to achieve 35 deg F /19 deg C.

By adding a second jumper, one on “15 deg F” and one on “25 deg F”, it is possible to achieve 40 deg F/22 deg C.

2. As shipped, the VARI-PRIME has a jumper on the (JP4) terminal, to operate a 0-10 VDC output. If a 4-20 mA output is needed,

move the jumper to the (JP5) terminal.

3. VARI-PRIME can operate in °F or °C. A jumper on the (JP1) terminal has set the default to °F. Remove that jumper for °C.

4 If Main Gas valve is “OFF” AND a call for heat is “TRUE” then the PCB overrides the PID control and runs the pump

output at 100% (10 VDC, or 20 mA).

5. Once the Main Gas valve is energized the PCB will maintain pump output at 100% for 60 seconds to allow the system to stabilize.

Once the 60 second timer has expired, the PCB will then run the pump output speed based on the jumper setpoint.

6. When“T-T”issatised,thePCBwillrunpumpat100%outputforthedurationofthepumpoverruntime.

7. The VARI-PRIMEPCBhasalowendcaptopreventnuisancelowowtrips.Thecapisfactoryprogrammedto2VDC.

8. Factory settings are: Degrees - Fahrenheit Output Signal - 0 -10VDC

800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors)

20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (Applications Engineering)

1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130

www.Laars.com

FOR YOUR SAFETY: This procedure must be performed by a professional service technician, qualied in

hot water boiler installation. Improper connections could create an electrical hazard, which could cause

serious injury, property damage, or death.

Document 7025BInstallation Kit

VARI-PRIME

Installation Kit for

VARI-PRIME

Modulating Boilers

Model NTH.

Sizes 1000-1700 MBTU/h

NEOTHERM

INSTALLATION INSTRUCTIONS

P.I.D. CONTROL ADJUSTMENT:

With Variable Speed Pumping, the boiler control P.I.D. needs to be

adjusted.

• These settings are found in your NeoTherm controls under:

    AdvancedSetup>CHCong>CHCong

It is recommended to start with:

P = 20 I =15 D = Factory set-point

Depending on pump sizing and application requirements; these P.I.D.

settings may

 needtobeusedtone-tuneboilerperformance.

• Once you have adjusted the P.I.D. contols, then disconnect power source

from boiler.

• Remove front panels from boiler.

• Pull the sliding panel control straight outward, as shown.

Photo 1

1 2 3 4 5 6

Summary of Contents

Page 1 - NEOTHERM

pg 1 of 6H2352500BCustomer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.33

Page 2 - 1700 MBTU/h

pg 2 of 6H2352500BCustomer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.33

Page 3 - 8 7 6 5 4 3 2 1

pg 3 of 6H2352500BCustomer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.33

Page 4 - Terminal

pg 4 of 6H2352500BCustomer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.33

Page 5

pg 5 of 6H2352500BCustomer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.33

Page 6 - NEOTHERM NT 285-850

pg 6 of 6Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 •

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Laars NeoTherm LC NTH (Sizes 1000-1700 MBTU/h) - Install User Manual

Browse online or download User Manual for Water boiler Laars NeoTherm LC NTH (Sizes 1000-1700 MBTU/h) - Install. LAARS NeoTherm LC NTH (Sizes 1000-1700 MBTU/h) - Installation Manual User Manual

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