LAARS Rheos+ RHHV - Install and Operating Manual - Manual (Page 38)

Rheos+ Boiler and Water Heater Page 37
Figure 25 - Gas/Air Test Panel
Figure 26 - Test Panel Valves
5. Remove the two plugs from the + and – ports of
the air orifice taps, thread hose barbs into the
1/8" NPT connections, and attach the manometer
pressure lines to the barbs. Be sure all
connections are gas tight.
6. Switch on the appliance power switch located on
the front of the unit.
7. The Rheos+ will enter the start sequence. The
blower and pump come on for pre-purge, then
the ignitor warm-up sequence starts and after all
safety devices are verified, the gas valve opens. If
ignition doesn’t occur, check that there is proper
gas supply. Wait 5 minutes and start the unit
again.
8. Open air orifice test port valves. Check air
orifice differential at full fire, and make note of
the differential.
9. Switch the Rheos+ off.
10. Close air orifice valves, remove the barbs and
replace the plugs. Make sure the connections are
gas tight.
11. Remove the two plugs from the + and – ports of
the gas orifice taps, thread hose barbs into the
1/8" NPT connections, and attach the manometer
pressure lines to the barbs. Be sure all
connections are gas tight.
12. Switch on the appliance power switch located on
the front of the unit.
13. The Rheos+ will enter the start sequence. The
blower and pump come on for pre-purge, then
the ignitor warm-up sequence starts and after all
safety devices are verified, the gas valve opens.
14. Open gas orifice test port valves. Check gas
orifice differential at full fire, and make note of
the differential.
15. Close gas orifice valves, remove the barbs and
replace the plugs. Make sure the connections are
gas tight.
16. If gas and air orifice differentials match what is
shown in Table 7, and do not differ from each
other by more than 0.1" w.c., the unit is properly
set up. If not, consult, the factory.
17. After placing the appliance in operation, the
Burner Safety Shutoff Device must be tested.
To test:
(a) Close gas shutoff valve with burner
operating.
(b) The flame will go out and blower will
continue to run for the post purge cycle.
One additional attempt to light will follow
including pre-purge, ignitor on, valve/flame
on and post purge. Ignition will not occur
as the gas is off. The ignition control will
lockout, and will have to be reset before the
unit will operate.
Valve
Shown
Closed
Valve
Shown
Open