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Installation Instructions
NTI Boilers Inc.
Tel: (506) 657-6000
Toll Free: 1-800-688-2575
Fax: 1-506-432-1135
Web: www.ntiboilers.com
Email: info@ntiboilers.com
Applicable Appliance Models
Tx200, Tx200C
Kit Contents
85002 – Gas Valve
83134 – Regulator Adapter
Tools Required
Pipe Wrench (for gas line)
Adjustable Wrench (for gas line union)
5/16" Nut Driver
Phillips #2 and #1 Screwdriver
Flat Screwdriver
Torx T25 Screwdriver
Torx T40 Screwdriver
Combustion Analyzer
The installation of this gas valve must be performed by a qualified gas technician in accordance
with these instructions. Installing this valve without the proper background and training is
hazardous and may result in property damage serious injury or death.
Replacement Instructions
1) Shut off the power and gas supply to the boiler.
2) Remove the gas supply line from the gas valve.
3) Remove the gas valve harness and feedback tube from the gas valve.
4) Remove the screws securing the gas valve to the Venturi (T25) and remove the gas valve from the boiler.
5) Transfer gas line inlet adapter to the new valve. Use care to ensure that the O-ring gasket does not fall out.
6) Transfer gas valve outlet gasket to the replacement gas valve. Propane (LP): if equipped with an LP orifice, reinstall
it in the outlet of the new gas valve (see Figure 2).
7) Reinstall the new valve in the reverse order and perform the Combustion Calibration Procedure detailed on the
following pages.
S:\NTI2001_N_Drive (1-20-09)\R&D\PARTS - ENGINEERING\Parts Department Stickers and Instructions\Current Parts Instructions (doc)\Parts
instructions word docs\85002 instructions - Gas Valve 120Vrac VK4115.doc
85002
Gas Valve 120Vrac VK4115
O-ring – Failure to properly re-intstall the gas line adapter O-ring will result in gas leakage
which may cause property damage, serious injury, or death.
Feedback Tube – Reconnect the tubing from the air-inlet to the gas valve feedback port.
Failure to properly reconnect the feedback tube will negate the boiler's blocked vent safety
shutoff mechanizm, and could lead to incorrect combustion resulting in property damage,
serious injury or death.
85002 │ Gas Valve 120Vrac VK4115
Figure 1 Gas Valve
83134 Regulator
Adapter installed
Revision Date: 2019-06-19
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Summary of Contents for NTI 85002
- Page 1 Failure to properly reconnect the feedback tube will negate the boiler’s blocked vent safety shutoff mechanizm, and could lead to incorrect combustion resulting in property damage, serious injury or death. S:\NTI2001_N_Drive (1-20-09)\R&D\PARTS - ENGINEERING\Parts Department Stickers and Instructions\Current Parts Instructions (doc)\Parts instructions word docs\85002 instructions - Gas Valve 120Vrac VK4115.doc...
- Page 2 85002 │ Gas Valve 120Vrac VK4115 Installation Instructions Figure 2 - Gas Valve Outlet Gasket (LP-orifice) Propane – install LP-orifice in the outlet gasket of the gas valve LP-orifice Outlet Gasket Combustion Calibration Procedure To calibrate burner combustion, perform the following procedure using a calibrated combustion analyzer capable of...
- Page 3 85002 │ Gas Valve 120Vrac VK4115 Installation Instructions Throttle Screw Adjustment The gas valve Throttle Screw (see Figure 3) is used to calibrate the CO concentration with the burner operating at or near the maximum modulation rate (see Table 2). Turning the Throttle Screw in (clockwise) decreases the CO concentration.
- Page 4 85002 │ Gas Valve 120Vrac VK4115 Installation Instructions Failure to close the bleed screw of the Line Pressure Test Port will cause a severe leakage of gas, resulting in a fire or explosion causing property damage, serious injury or death.
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