MULTIPLE INSTALLATIONS
30
To set and commission the pressure reducing valves:
1. Commissioning: Commission each of the water heaters prior to setting the pressure reducing valve on
the cold (or solar preheat) branch to the water heater (refer to “Commissioning” on page 31).
2. Turn on services: Turn on the water, gas and electricity to the water heaters.
3. Locking screw: Loosen the locking screw on each SYR valve with a flat bladed screw driver.
To adjust the SYR valve during this commissioning procedure, turn the knob:
Anti-clockwise = delay unit ignition
Clockwise = bring forward unit ignition
4. Open a hot tap: Open 1 x hot shower or tap to between 7-8 litres / min. The first water heater (without
SYR valve) should ignite and provide hot water.
Notes:
The flow rate from each shower or tap throughout this commissioning procedure should be between
7-8 litres / min.
When turned on, each shower or tap must be at an equal flow rate.
5. Temperature limiting device: Set the temperature of any temperature limiting device installed
downstream of the manifold.
6. First water heater: Open the maximum number of showers suitable for 1 x water heater in accordance
with the climate chart. Only the first water heater should be operating.
If other water heaters are operating, adjust their SYR valves by turning the knob anti-clockwise until the
water heater turns off.
7. Second water heater: Open the next shower. The second water heater should ignite.
If it fails to ignite, adjust the SYR valve by turning the knob clockwise until the water heater turns on.
If other water heaters ignite, adjust their SYR valves by turning the knob anti-clockwise until the water
heater turns off.
8. Turn off the previous shower. The second water heater should turn off.
If it does not turn off, adjust the SYR valve by turning the knob anti-clockwise until the water heater turns
off.
9. Open the maximum number of showers suitable for 2 x water heaters, in accordance with the climate
chart. Only the first two water heaters should be operating.
If other water heaters downstream are operating, adjust their SYR valves by turning the knob anti-
clockwise until the water heater turns off.
10. Subsequent water heaters: Repeat steps 7 to 9 for each subsequent water heater in the bank.
11. Locking screw: Turn off all showers and lock adjusting screw on the SYR valves. Commissioning is
now complete.
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