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Gas‐fired, balanced flue or
power‐vented unit heater
VRC‐3
20‐3, 30‐3, 45‐3, 60‐3
75‐3, 100‐3
INSTALLATION – COMMISSIONING – SERVICING ‐ USER
WARNING
Improper installation, adjustment, alteration, service, or maintenance can cause property
damage, injury, or death. All work must be carried out by appropriately qualified persons. The
manufacturer does not take any responsibility in the event of non-observance of the regulations
concerning the connection of the apparatus causing a dangerous operation of the apparatus, possibly
resulting in damage to the apparatus and/or environment in which the unit is installed.
Please read this document carefully before commencing installation commissioning and/or servicing.
Leave it with the user or attached to the appliance or gas service meter after installation.
This appliance meets the following EC Directives
DIR 2009/142/EC : GAD
DIR 2014/30/EC : EMC
DIR 2014/35/EC : LVD
DIR 2006/42/EC : MD
INSTRUCTIONS
1704VRC-3AMEN
Subject to modifications
1704VRC3‐AMEN, p. 1/35
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Related Manuals for BENSON VRC-3 20-3
Summary of Contents for BENSON VRC-3 20-3
- Page 1 1704VRC-3AMEN Gas‐fired, balanced flue or power‐vented unit heater VRC‐3 20‐3, 30‐3, 45‐3, 60‐3 75‐3, 100‐3 This appliance meets the following EC Directives DIR 2009/142/EC : GAD DIR 2014/30/EC : EMC DIR 2014/35/EC : LVD DIR 2006/42/EC : MD INSTALLATION – COMMISSIONING – SERVICING ‐ USER INSTRUCTIONS WARNING Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. All work must be carried out by appropriately qualified persons. The manufacturer does not take any responsibility in the event of non-observance of the regulations concerning the connection of the apparatus causing a dangerous operation of the apparatus, possibly resulting in damage to the apparatus and/or environment in which the unit is installed.
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Page 2: Table Of Contents
TABLE OF CONTENTS 1.0 INTRODUCTION 6.0 COMMISSIONING AND TESTING 1.1 Basic Information 6.1 Electrical Check 1.2 Warranty 6.2 Gas Connection 6.3 Suspension and Support 2.0 TECHNICAL DATA 6.4 Lighting the Heater 2.1 Technical data 6.5 Heater pipe work ... -
Page 3: Introduction
INTRODUCTION 1.1 Basic Information The instructions in this manual apply to Model VRC‐3 gas‐fired/fan‐assisted warm air heaters. These models have an axial fan for air delivery. These heaters are designed for overhead suspension and are suitable for indoor installation only installed at an operation ambient temperature between ‐15°C and 45°C. When installed as a type C12/C32 and where the height above floor level is greater than 1,8 metres ... -
Page 4: Burner Pressure
2.2 Burner pressure & injector size Table 2A: Injector size and burner pressure G20 natural gas (Inlet pressure = 20.0 mbar ) 20-3 30-3 45-3 60-3 75-3 100-3 Quantity 2,10 2,10 2,20 2,70 2,70 2,90 Injector size marking Burner pressure (mbar) (1) 8,00 7,25 6,90 8,50 8,30 7,50 Table 2B: Injector size and burner pressure G30/G31 butane/propane (Inlet pressures G30 = 28mbar ‐ G31 = 37mbar) 20-3 30-3 45-3... - Page 5 VRC 30-3 VRC 45-3 1704VRC3-AMEN, p 5/35...
- Page 6 VRC 60-3 VRC 75-3 1704VRC3-AMEN, p 6/35...
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Page 7: Blower Options
VRC 100-3 2.4 Blower options Damper position 2.4.1 Mixing cabinet Bottom exit Rear exit closed open open closed half half VRC 20-3 with mix box 1704VRC3-AMEN, p 7/35... - Page 8 VRC 30-3 with mix box VRC 45-3 with mix box 1704VRC3-AMEN, p 8/35...
- Page 9 VRC 60-3 with mix box VRC 75-3 with mix box 1704VRC3-AMEN, p 9/35...
- Page 10 VRC 100-3 with mix box 2.4.2 Mixing cabinet and filters VRC 20-3 with mix box and filters 1704VRC3-AMEN, p 10/35...
- Page 11 VRC 30-3 with mix box and filters VRC 45-3 with mix box and filters 1704VRC3-AMEN, p 11/35...
- Page 12 VRC 60-3 with mix box and filters VRC 75-3 with mix box and filters 1704VRC3-AMEN, p 12/35...
- Page 13 VRC 100-3 with mix box and filters 2.4.3 Free blowing Free blowing Dimensions [mm] LCSC Restriction B C part no ‐ ‐ ‐ ‐ 1002436 70 240 1002437 154 154 320 1002438 130 154 320 1002439 130 154 396 1002440 166 178 396 1704VRC3-AMEN, p 13/35...
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Page 14: Dimensions
2.5 Dimensions STANDARD UNIT 1704VRC3-AMEN, p 14/35... - Page 15 UNIT WITH MIXING CABINET (option 526) 1704VRC3-AMEN, p 15/35...
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Page 16: General Requirements
GENERAL REQUIREMENTS 3.1 Related documents It is important that all gas appliances are installed Air heaters should not be installed in in accordance with the rules in force and by corrosive atmospheres, i.e. near plating or appropriately qualified persons. Failure to install degreasing plants or in areas where there appliances correctly could lead to prosecution. It is ... - Page 17 IMPORTANT: The flue must be installed in accordance with national and local regulations. Failure to provide proper flueing could result in death, serious injury and/or property damage. The air heater must be installed with a flue to the outside of the building. Safe operation of any power vented gas apparatus ...
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Page 18: Air Supply
Figure 2b : Table 6 Combustion air and flue pipe sockets, Type C Combustion air inlet & flue pipe requirements 20 & 30 other sizes VRC-3 Flue pipe Heater socket & pipe dia Inlet pipe Flue pipe Max. straight length Inlet pipe Flue pipe 0,75 Equivalent length of 45° elbow Inlet pipe 0,75 Flue pipe Equivalent length of 90°... -
Page 19: Gas Supply
When a number of heaters are to be connected as part of a single installation each heater must be provided with a separate isolator. The electrical connection to the air heater is at the back of the appliance. The final connection must be made in the terminals provided in the control compartment. Follow the wiring diagram provided with the air heater. ... -
Page 20: Gas Connection
4.3.1 Fitting the flue pipe Table 7 Flue pipe socket size (dia mm) The flue pipe socket is located on the back of the air heater. Flue pipes must VRC-3 20 & 30 Other sizes be sealed. Use seamless, aluminium pipe or equivalent. Follow pipe manufacturer's instructions (see figures 4 & 5). Socket 4.3.2 Installing a guard on the combustion air inlet pipe for power vent (Type B installations) The combustion air inlet socket is located at the back of the heater. When installed as a type B appliance, protect the inlet by fitting an access guard on the socket. Do not block this socket as it supplies combustion air for the burner (see figure 4). Table 8 Air inlet socket size (dia mm)) 4.3.3 Fitting the combustion air inlet pipe for balanced flue (Type C ... -
Page 21: Electrical Connections
4.5 Electrical connections THIS APPLIANCE MUST BE IMPORTANT: If the reset button requires activating for any reason the cause should be identified before resetting. After EARTHED! resetting stay with the appliance for long enough to ensure that danger lock‐out does not reoccur (suggest 5 minutes).Fix all electric cables and installer’s wiring to the control panel and ensure they ... -
Page 22: Gas Connection
* Carry out a polarity test. Connect one lead of a suitable AC voltmeter to earth and connect the other lead to the live supply terminal (L) at the air heater. Switch ON the power to the air heater and check for correct voltage. The same result should be obtained by connecting the test leads between live and neutral. Connect the voltmeter test leads to N and E. A reading of 0V should be obtained. If these tests do not conform to the above, there is a fault which must be rectified before proceeding further with the commissioning; * Check that a suitable thermostat or control panel has been fitted; * Ensure that an electrical isolator with two pole separation with a minimum air break between poles of 3,0 mm has been fitted adjacent to the air heater. 6.2 Gas connection Never use a flame for checking Only persons formally qualified to work gas soundness. ... -
Page 23: Adjustments
6.5 Air heater gas pipe work The soundness of the air heater pipe work has been Never use a flame for checking gas checked prior to leaving the factory. However during soundness. installation, connections may have been loosened. Check the soundness of the appliance pipe work using a soapy solution. If any leaks are found they must be rectified immediately. 6.6 Adjustments 6.6.1 Burner gas pressure adjustment ... -
Page 24: Handing Over
6.8 Air heater controls and operation Check air heater operation after all adjustments have Table 9 Combustion air pressure control settings been carried out. Set the temperature control above Normal Set point ambient temperature. equilibrium 'off' VRC‐3 air heaters are fitted with a pressure sensitive, warm (Pascal) (Pascal) combustion air safety control that monitors the combustion ... -
Page 25: Removal And Replacement Of Parts
Service procedure The following procedures should be carried out at least annually: 1. Remove the burner assembly as in section 8.1. Clean thoroughly, (cleaning the burners requires an emery cloth, wire brush and a cleaning cloth ‐stubborn deposits on burners are best cleaned using "acetone" as a solvent). * Check the condition of the ignitor and clean to remove all deposits. Check the spark gap (3,0 mm). * Check the sensor ‐ clean as necessary. * Remove ... -
Page 26: Ignition System
Instructions for re‐assembly: 1. Reverse the procedure for removal making sure that all parts are installed correctly. Check that all components are secure. 2 When lighting, always follow the lighting instructions on the air heater. 8.2 Burner injectors 1. Carry out steps 1 to 6 of section 8.1. 2. Unscrew the main burner injectors. 3. Re‐fit new injectors. 4. Re‐assemble in reverse order. 8.3 Ignition system To access the ignition system, follow steps 1 to 3 in § 8.1. Due to high voltage on the spark wire Ignitor‐ ... -
Page 27: Combustion Air Fan
8.6 Combustion air control/switch If it is determined that the air differential pressure switch needs replacing, use only authorized replacements that are designed for the air heater being serviced. These switches are calibrated to operate at the designed combustion air flow duty for each appliance size in the product range. 8.7 Combustion air fan (venter) ( ... -
Page 28: Fault Finding
FAULT FINDING Fault finding may only be carried out by appropriately qualified persons 9.1 Main fault finding chart ‐ Lock‐out indicator light is "OFF", but air heater will not operate Is the thermostat above room temperature and if used is the time Set thermostat above room clock"ON" temperature & if used make certain the time clock is ON Is power venting operating? Is there continuity between terminals 9 &10 Reset limit control... - Page 29 9.2 Ignition Controller Lockout indicator Light Repeatedly Comes "ON" Is polarity of mains correct? Correct polarity Does the inlet gas pressure agree with the correct the gas supply data badge pressure Wait 15" and press reset button Check spark gap and ceramic & check During 5" trial for ignition is spark wire &...
- Page 30 9.3 Limit Control Fault Finding Chart (limit control trips) Note VRC‐3 air heaters are equipped with 2 limits (a recycling limit and a manual reset limit). During normal operation, neither limit should trip even if the main electric supply is interrupted during operation. In the event of motor failure, the recycling limit will trip opening the gas valve. Adjust thermostat Replace temp. setting above the motor ambient to energize fan & gas solenoid valve Is there 220-240V at terminals N and 4? Does the fan motor operate? Has any non-factory authorized air distribution device been placed on the heater? Is there excessive Consult fan static pressure in the ductwork? Did the motor overload...
- Page 31 PARTS LISTING Description Part number Settings 175Pa out 203Pa in Delta P switch S3: VRC 20‐3/30‐3 30 60617 175 Delta P switch S3: VRC 45‐3 30 60621 155 1627Pa out 1767Pa in Delta P switch S3: VRC 60‐3/75‐3/100‐3 30 60617 175 175Pa out 203Pa in Overheat control device LC1 03 24959 04 90°C out 85° C in Venter motor 11 43426 04 Gas valve one stage 45‐3/60‐3/75‐3/100‐3 03 25136 ...
- Page 32 USER INSTRUCTIONS Operating Gas is burned by an atmospheric burner which fires into a heat exchanger. The gas burner is controlled by a double gas valve via an electronic burner control, which is actuated automatically via external controls i.e. a room thermostat and/or a time switch. The burner is ignited by a spark igniter. When the burner fires and warms the heat exchanger, the heat is sensed by a thermally actuated fan control which switches on the fan when the air temperature has reached its preset operating level. At the end of a heating cycle the burner is switched off, the air ...
- Page 33 HEALTH & SAFETY STATEMENT General Under the Consumer Protection Act 1987 and Section 6 of the Health and Safety at Work Act 1974 we hereby provide the following information on substances hazardous to health. Product range reference VRC‐3 air heaters. Cautionary note During first firing some smoking may occur, this is due to the burning off of protective/lubricating oils used ...
- Page 34 CERTIFICATE EC DECLARATION OF CONFORMITY OF MACHINERY (Annex II 1 A of EC Machinery Directive 2006/42/EC) The manufacturer Nortek Global HVAC Belgium nv J&M Sabbestraat 130/A000 B‐8930 Menen, Belgium Hereby declares that the following gas‐fired unit heaters: VRC‐3 Types 20‐3, 30‐3, 45‐3, 60‐3, 75‐3, 100‐3 Complies with the requirements of the above mentioned machinery directive Complies with the requirements of further directives, namely GAD 2009/142/EC ‐ EMC 2004/108/EC – LVD 2006/95/EC the following harmonized standards have been applied: EN 1020: Non‐domestic gas‐fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, incorporating a fan to assist transportation of combustion air and/or combustion products. ...
- Page 35 NORTEK GLOBAL HVAC (UK) LTD Fens Pool Avenue Brierley Hill West Midlands DY5 1QA United Kingdom Tel. 01384 489 250 www.ambirad.co.uk Registered in England N°...
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