Technical data

© MHG Heating Ltd
59
MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
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Web www.mhgheating.co.uk
010109
[#]
Description Range Defaults
147 Central Standby Switching
0. Deactivated
1. Activated
0-1 0
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
149 Auto Time Adjustment Spring
Date and Month of Last Sunday in March
Date/Month 25.03
150 Auto Time Adjustment Autumn
Date and Month of Last Sunday in October
Date/Month 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
171 Minimum Temperature Set Point Via H1 (170 = 2) 8-95 80
172 Maximum Temperature Set Point Via H1 (170 = 4) 5-130 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