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LAARS HEATING SYSTEMS

Page 10

speed. Do not operate a summer exhaust fan.
Close fireplace dampers.

4.

Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust
thermostat so appliance will operate
continuously.

5.

Test for spillage at the burner opening after five
minutes of main burner operation.

6.

After it has been determined that each appliance
remaining connected to the common venting
system properly vents when tested as outlined
above, return doors, windows, exhaust fans,
fireplace dampers and any other gas burning
appliance to their previous conditions of use.

7.

Any improper operation of the common venting
system should be corrected so the installation
conforms with the National Fuel Gas Code,
ANSI Z223.1. When re-sizing any portion of the
common venting system, the common venting
system should be re-sized to approach the
minimum size as determined using the
appropriate tables in Appendix G in the National
Fuel Gas Code, ANSI Z223.1.

1I. Water Piping of Boiler System

Figure 9 shows ‘typical’ plumbing installations.

It is recommended that unions and valves are used at
the boiler inlet and outlet so it can be isolated for
service. Check local codes for specific plumbing
requirements before beginning the installation.

An ASME pressure relief valve is supplied on all

JV boilers, and is pre-set at 30 PSI (207 kPa). The
relief valve outlet piping must discharge to a drain.
Under no circumstances should the relief valve piping
be a closed circuit.

A pressure reducing valve (automatic feed) must

be used to maintain system at constant proper pressure
(see Figure 9). Supply properly installed purge valves
to eliminate air from each circuit.

A drain valve is supplied with the boiler, and can

be found in the plastic bag shipped with each boiler.
This valve is to be installed on the lower right side of
the boiler (see Figure 2) and is used for draining the
unit. To drain the boiler completely, open the drain
valve and remove the two drain plugs located on the
lower left side of the boiler.

Be sure to include air vent devices located at the

highest point in the system to eliminate trapped air,
and an air elimination device near the outlet side of
the JV boiler. Manual vent valves are recommended.

Hot water piping should be supported by suitable

hangers or floor stands, NOT by the boiler. Due to
expansion and contraction of copper pipe,
consideration should be given to the type of hangers
used. Rigid hangers could transmit noise through the

system caused by the piping sliding in the hangers. It
is recommended that padding be used when rigid
hangers are installed.

A properly sized expansion tank must be

included in the system. Laars offers an air-charged
diaphragm-type expansion tank, with an automatic
feed valve, which includes a pressure regulator set at
12 psig.

1I-1. By-Pass Piping

The following information and suggestions are

made on by-pass piping as it affects the temperature
rise at the boiler. A boiler temperature rise must be
taken on all JVi boiler installations. If the temperature
rise exceeds 30°F (17ºC), it is an indication that the
boiler is not receiving adequate water flow. Check the
pump for any obstruction, replace the pump with a
larger size where necessary, or install a system by-
pass (illustrated in Figure 9).

On JVi sizes 125, 160, and 225 with a multiple

zone system, a by-pass is required to ensure proper
flow in addition to properly sized circulator and piping
system.

NOTE: On JVi sizes 160 and 225 a primary/

secondary piping system is recommended. In this
system, a circulator is dedicated to pumping the boiler
only. This circulator should be sized for the boiler
head loss and flow rate.

The two above piping configurations can also

apply to JVi sizes 50, 75 and 100, but generally, these
units require flow rates which are easily obtained
without a by-pass.

All precautions must be taken by the installer to

insure that a maximum temperature rise through the
boiler does not exceed 30°F (17ºC). The temperature
rise on boilers installed in multi-zone systems using
zone valves must be taken when the zone of the
longest length and/or the zone of the highest head loss
is open.

Please note that a 1" (25mm) diameter by-pass

with balancing ball valve must be installed if a return
water temperature of below 110°F (43ºC) is expected
under operating conditions (see Figure 9).

1J. Chilled Water Systems

If the boiler is installed in conjunction with

refrigeration systems, it shall be installed so that the
chilled medium is piped in parallel with the heating
boiler with appropriate valves to prevent the chilled
medium from entering the heating boiler.

When boiler piping is connected to heating coils,

which are in close proximity to refrigerated air
circulation, there must be flow control valves or other
automatic methods to prevent gravity circulation of
the boiler water during the cooling cycle.

Содержание Mini-Therm JVi JVH

Страница 1: ...l is not followed exactly a fire or explosion may result causing property damage personal injury or loss of life Do not store or use gasoline or other flammable vapors and liquids in the vicinity of t...

Страница 2: ...bustion Air Supply 5 1H Venting 6 1H 1 Vertical Venting Category I 7 1H 2 Horizontal Venting Category III 8 1H 3 Common Venting System 9 1I Water Piping of Boiler System 10 1I 1 By Pass Piping 10 1J C...

Страница 3: ...elected to provide for correct system design water temperature rise Table 2 details temperature rise and water flow for the Mini Therm boilers SECTION 1 General Information WARNING The JVi induced dra...

Страница 4: ...to be installed in a garage all burners and burner ignition devices must have a minimum 18 457mm clearance above the floor 4 The Model JVi 50 through JVi 225 boilers can be installed in a closet as lo...

Страница 5: ...the surrounding area as outlined in the latest edition of C B 2 4 6 1 A DRAIN 11 8 298 6 152 7 178 24 610 REF INDUCED DRAFT BLOWER MOTOR PULL OUT GAS MANIFOLD BURNER TRAY TEMP PRESSURE GAUGE TEMPERATU...

Страница 6: ...an is used to supply air to the boiler room the installer should make sure it does not create drafts which could cause nuisance shutdowns If a blower is necessary to provide adequate combustion air to...

Страница 7: ...ached to it Do not weld the vent pipe to the boiler collar The weight of the stack must not rest on the boiler The boiler top must be easily removable for normal boiler service and inspection Avoid te...

Страница 8: ...ing of 400 F 204 C see Table 9 for a list of approved sealing materials Use at least three corrosion resistant screws at each slip joint when required Description Manufacturer Product High Temperature...

Страница 9: ...onnected to the common venting system are located and other spaces of the building Turn on clothes dryers and any gas burning appliance not connected to the common venting system Turn bathroom exhaust...

Страница 10: ...to expansion and contraction of copper pipe consideration should be given to the type of hangers used Rigid hangers could transmit noise through the system caused by the piping sliding in the hangers...

Страница 11: ...Mini Therm JVi Page 11...

Страница 12: ...w switch it should be wired in series with the high limit switch The boiler will not fire unless the pump is running and the flow switch is closed Field installed safety devices and operating controll...

Страница 13: ...Mini Therm JVi Page 13 Figure 11 Wiring Diagram JVP Figure 10 Wiring Diagram JVH...

Страница 14: ...primary secondary pumping Connect to W in lieu of A Boiler relay is used for boiler pump and connection to W will energize boiler pump when any zone is calling for heat Wiring with Taco Zone Valves W...

Страница 15: ...ing these instructions Figure 15 Main Burner Pilot Flame Pattern SECTION 2 Operating Procedures Before placing the boiler in operation check and reset the safety shutoff devices Once the boiler is con...

Страница 16: ...f water temperature is below the limit setting the inducer motor relay will turn on the draft inducer 4 Pressure switch will sense the fan inducer operation and send 24 volts to the flame rollout swit...

Страница 17: ...ll next to the floor because some gas is heavier than air and will settle on the floor WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electric switch do not use any pho...

Страница 18: ...ft side of the heater which must be removed to drain that side Both sides must be drained 10 The gas and electric controls on the boiler are engineered for long life and dependable operation but the s...

Страница 19: ...on the terminal board and from the orange wire terminal on the pump relay to the W connection on the terminal board If no output is found the connections or the pump relay could be defective 6 Place...

Страница 20: ...gh boiler Check temperature rise between inlet and outlet boiler piping 15 F 8 C to 25 F 14 C temperature rise is recommended If temperature rise is over 25 F 14 C increase pipe size or pump capacity...

Страница 21: ...ER UNPLUG IGNITER MEASURE VOLTAGE AT TWO BOTTOM TERMINAL OF SV9501 SV9601 24 VAC NOMINAL YES YES YES YES YES NO NO NO YES NO NO NO Troubleshooting Honeywell SV9501 SV9601 Hot Surface Pilot System REPL...

Страница 22: ...ked Check electrical connections between module and pilot operator on gas control Check for 24 Vac across PV MV PV terminals on module If voltage is okay replace gas valve if not replace module Check...

Страница 23: ...Also known as radiation Isolation Valve Used to isolate the boiler from the circuit It minimizes the amount of water drained from the system Primary Secondary Piping Two or more interconnecting circu...

Страница 24: ...032900 L0032900 L0032900 L0032900 L0032900 L0032900 L0032800 L0032800 L0032800 L0032800 L0032800 L0032800 L0032700 L0032700 L0032700 L0032700 L0032700 L0032700 L0052601 L0052601 L0052602 L0052602 L005...

Страница 25: ...0032900 L0032900 L0032800 L0032800 L0032800 L0032800 L0032800 L0032800 L0032700 L0032700 L0032800 L0032800 L0032800 L0032800 L0052604 L0052604 LD052605 LD052605 LD052605 LD052605 E0088400 E0088400 E00...

Страница 26: ...4 Tee 1 2 Coupling Model 50 100 1 2 Close Nipple Front Panel Insulation Items 13 14 15 and 30 are not shown 18 19 17 24 29 39 42 16 22 21 26 34 2 6 1 11 5 37 4 3 41 40 Rear Panel Insulation 12 36 7 7...

Страница 27: ...Mini Therm JVi Page 27...

Страница 28: ...CA 93021 805 529 2000 FAX 805 529 5934 20 Industrial Way Rochester NH 03867 603 335 6300 FAX 603 335 3355 480 S Service Road West Oakville Ontario Canada L6K 2H4 905 844 8233 FAX 905 844 2635 www laar...

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