Laars NeoTherm NTH (Sizes 285–850 MBTU/h) - Installation User Manual download pdf

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H2368400

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 1405 Document 7031

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

• Remove front panels from boiler.

• Mount the VARI-PRIME control box in desired location. The side of the boiler is an

acceptable mounting location.

Important: Ensure there is nothing on the back side of the jacket before mounting.

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 7031Installation Kit

VARI-PRIME

Installation Kit for

VARI-PRIME

Modulating Boilers with EMEA Display

Model NTH. Sizes 285–850 MBTU/h

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.

• Run the wires from the VARI-PRIME control box, through the chosen ‘knock-out’ hole

and into the boiler. See Figure 1. Power wires must be run through conduit from the

VARI-PRIME box to the boiler. The Black and White wires are for the 120V pump contact.

Figure 1

NEOTHERM

1 2 3 4

Summary of Contents

Page 1 - NEOTHERM

pg 1 of 4H2368400Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335

Page 2 - Terminal

pg 2 of 4H2368400Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335

Page 3 - H2368400

pg 3 of 4H2368400Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335

Page 4 - NEOTHERM NT 285-850

pg 4 of 4Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 •

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