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ULTRAMAX PB 65 - 120
27 L290 ©MHS Boilers 13/12/2010
Boiler Wiring Terminals
Terminal Designation
Terminal #s
Voltage
Screened
Cable
(Earthed
Screening)
Description/Operation/Function
50 & 51
(Not Polarity
Sensitive)
< 25V
Yes
QAA73 Opentherm Room Unit or Link to enable second heating zone time
switch.
(AGU2.500 Communication Clip required to control second heating zone
pump/valve.)
52 & 53
(Not Polarity
Sensitive)
< 25V
Yes
Heating Volt Free Enable. (Via Time Switch/Room Thermostat/BMS)
(Link to be removed if QAA73 fitted)
54 & 55
(Not Polarity
Sensitive)
< 25V
Yes
Safety Interlock Volt Free Enable
(Must be wired in series with the low pressure gas switch)
(For use with ventilation interlocks/gas pressure switch etc.)
56 & 57
(Not Polarity
Sensitive)
< 25V
Yes
Do Not Use.
Boiler Operation Override Volt Free Enable.
58 & 59
(Not Polarity
Sensitive)
< 25V
Yes
Hot Water Sensor (QAZ36) or Volt Free Enable.
(Via Time Switch/Calorifier Thermostat/BMS)
(Parameter alteration required if Volt free enable used)
60 & 61
(Not Polarity
Sensitive)
< 25V
Yes
Outside Air Sensor. (QAC34)
(Mounted on North Facing Wall)
(Parameter alteration required if outside air sensor not connected)
L1
230V
-
Permanent Live (Max 5 Amp)
N
230V
-
Permanent Neutral
E
230V
-
Permanent Earth
1 & 2
230V
-
External Temperature Limiting Device Interlock, Optional
Low Primary System Pressure Switch Used in Conjunction with an Internal Plate
Heat
Exchanger.
3 & 4 (5)
230V
-
Hot Water Charging Pump or 3 way Valve Output.
(Max 1 Amp)
(Terminal 5 is a permanent Live 230V output)
6 & 7
230V
-
Internal Boiler Pump. (Max 1 Amp) (When operated without RVA47 Cascade
Manager)
External Heating Pump. (Max 1 Amp) (When operated with RVA47
Cascade Manager) (Parameter alteration required)
8 & 9
230V
-
External Heating Pump.
(Max 1 Amp) (When operated without RVA47 Cascade Manager)
Internal Boiler Pump.
(Max 1 Amp) (When operated with RVA47 Cascade Manager)
(Parameter alteration required)
20
230V
-
Optional External Boiler/Transfer Pump Live Output.
To be used when an internal plate heat exchanger or low loss header option has
been applied.
21
230V
-
Optional External Boiler/Transfer Pump Neutral Output.
To be used when an internal plate heat exchanger or low loss header option has
been applied.
E
230V
-
Optional External Boiler Pump Earth.
For cascade control via a RVA47 cascade manager each boiler must be fitted with an
OCI420 Clip.
ADDITIONAL INFORMATION REGARDING ELECTRICAL SUPPLIES IS GIVEN IN BS EN60335, PART 1.
9.0 Electrical Installation cont.
9.4 Boiler Wiring Terminals
27


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  • What is the fault code 153 on ultramax pb 120 boiler Submitted on 10-12-2021 at 10:53

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