Operating instructions

2
3c
3b
3a
12
7a
7b
10a
4
32
TS@ control thermistor will call for heat. Bringing the pump and
burners to operate, this is quite normal.
The 3 way valve (15 fig. 7) will move to the domestic hot water
position. The hot water from the primary circuit is then diverted
to heat the mini cylinder via the coil and the secondary heat
exchanger.
The safety solenoid (3a fig. 7) and the first stage solenoid (3b
fig. 7) open together to allow a low rate of gas to the burner.
The ignition sequence begins and a continuous high speed
spark ignites the gas. As soon as a flame is detected the orange
indicator bulb ID (39 fig. 6) will light and the burner will remain
on low rate until the TSS@ control thermistor (28 fig. 7) is
satisfied. If a flame is not detected, after 8 seconds, the security
and first stage solenoids close and shut off the gas.
The red lockout indicator bulb 9; (40 fig. 6) will light.
The hot water flow temperature is controlled by the primary
circuit control thermistor (14 fig. 7).
When the cylinder thermistor is satisfied, the burner is
extinguished and the pump remains running for 10 seconds at
low speed.
The boiler will now stay in the hot water mode for 30 sec. (this
can be set to 3 minutes if required. See Maintenance and
Service Guide).
Priority is given to a demand for hot water or reheating the mini
cylinder.