Laars Mini-Therm II JV Installation and operation instructions manual - page 14
LAARS HEATING SYSTEMS
Page 14
VR8304
VR8300
Table 6. Gas Valve Selection.
pressure regulator is also installed in the line,
adjust it to the same pressure.
3.
Close all gate valves. Purge one circuit at a time
as follows:
a.
Open one circuit drain valve and let water
drain out for at least 5 minutes. Be certain
there are no air bubbles visible in the water
stream before closing the drain valve.
b.
Repeat this procedure for each circuit.
4.
Open all gate valves after all circuits have been
purged.
5.
Run the system circulating pump for a minimum
of 30 minutes with the boiler shut off.
6.
Open all strainers in the system, and check for
debris.
7.
Recheck all air vents as described in Step 3 above.
8.
Some expansion tanks require visual inspection
of liquid level. If necessary, inspect the liquid
level in the expansion tank. With the system
full of water, and under normal operating
pressure, to ensure proper water level in the
expansion tank.
9.
Start up boiler according to the procedures
described in Section 2 and operate the system,
including the pump, boiler, and radiation units,
for one hour.
10.
Recheck the water level in the expansion tank,
if necessary. If it exceeds ½ of the volume of
the tank, open the tank drain and reduce the
water level.
11.
Shut down the entire system, and vent all
radiation units and high points in the system.
12.
Close the water makeup valve and check the strainer
in the pressure reducing valve for sediment or
debris. Reopen the water makeup valve.
13.
Verify system pressure with the boiler pressure
gauge before beginning regular operation.
SECTION 2
Operation and Maintenance
2A-1. System Start-Up
WARNING
Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
which has been under water.
1.
Verify that the pump system is operating
properly:
a.
Shut off the manual gas valve located
outside the boiler.
b.
Raise the wall thermostat high enough to
call for heat.
c.
The pump should come on immediately. If
it doesn't, test the electrical circuits.
2.
Pilot Lighting:
WARNING
If you do not follow these instructions exactly, a
fire or explosion may result causing property
damage, personal injury or loss of life.
a.
The JVS boilers do not require manual
lighting. The pilot is controlled by the
automatic ignition system.
b.
The JVT boilers do require manual pilot
lighting. For access to the pilot burner,
remove the louvered airbox cover by
loosening the two thumb screws.
c.
Different models of the JV boiler utilize
various gas valves. Although the gas valves
may have different control knobs, they are
all similar in operation. The JVS gas valve
has a two-position knob, ON and OFF. The
JVT valve has a three-position knob, ON,
OFF and PILOT, some models come with
extra push-button (see Figure 11).
Sizes
Firing
System
Type of
Gas
Valve
Number
Manufacturer
JVS
50-225
Spark
Ignition
Natural or
Propane
VR8304H
Honeywell
JVT
50-225
Standing
Pilot
Natural or
Propane
VR8300H
Honeywell
14.
Within 3 days of start-up, recheck and bleed all
air vents and the expansion tank using these
instructions.
Figure 11. Gas Valves.