Technical data

© MHS Boilers Ltd
221106 Draft Copy E&OE
28
[#] Description Range 150 & 225
Standalone
150 & 225
Master
Cascade
148 Clock Mode
0. Autonomous All Clocks Can Have Different Times
1. System Time Without Adjustment
2. System Time With Adjustment
3. System Clock Master. There Can Only be One Master
0-3 2 2
149 Auto Time Adjustment Spring
Date and Month of Last Sunday in March
Date/Month 25.03 25.03
150 Auto Time Adjustment Autumn
Date and Month of Last Sunday in October
Date/Month 25.10 25.10
170 Operation of H1 Terminal
0. Changeover of Operation When Volt Free Switch is
Made. (HWS Stopped)
1. Changeover of Operation When Volt Free Switch is
Made. (HWS Unaffected)
2. Minimum Flow Temperature Maintained When Volt
Free Switch is Made. (Set at 171.)
3. Heat Generation Stopped When Volt Free Switch is
Made.(Frost Active)
4. 0-10 Volt Control to Vary System Flow Temperature.
(Curve set at 172)
(Terminal #1. 0-10 volt. Terminal #2. Ground.)
{If a 0-10 volt signal is the required heat generation
control method for the RVA47 / boiler installation this
setting must be adjusted to 4. Alterations must also be
made to parameter #17. The setting must be adjusted
from 32 to – on all RVA47s present in the boiler
cascade installation. This will result in the Auto,
On/Off and Frost lights becoming inactive. Possible
alterations to parameter #172 may also be required.}
0-4 0 0
171 Minimum Temperature Set Point Via H1 (170 = 2) 8-95 80 80
172 Maximum Temperature Set Point Via H1 (170 = 4) 5-130 82 82
173 Operating Action of H1 control contacts.
0. The contact is Normally Closed.
1. The contact is Normally Open.
{The RVA47 will operate according to its internal
time switches and presets.
If a remote BMS is controlling the RVA47 via a
Volt Free switch across H1 ‘0’ should be
inserted.
This will allow the boilers operate when the Volt
Free switch is made and stopped (Blocked.) when
the switch is opened.
If you are controlling the lead (master) RVA/Boiler
via a volt free switch across H1, all slave modules
should be left with ‘1’ as the input.
This will allow the AUTO light and the OFF light to
indicate their operational mode dictated by the lead
(master) RVA/Boiler.}
0-1 1 1
OEM Level
2 Maximum Module Temperature
When Operating In Manual Mode
8-120 82 82