3
In order to satisfy the increasing need for
higher efficiencies and to complement the
development of efficient heating systems
AmbiRad has upgraded their ‘SmartCom’ range
of controllers.
With a new larger, back lit screen and simpler
to operate with intuitive programming,
SmartCom³ provides cost effective energy for
small single heater installations through to large
Introduction
multi-zone applications requiring centralised
control. This operating manual gives simple
step by step instructions for both the end user
and commissioning engineer alike.
This control must be installed according to
the current Regulations and should include
full disconnection means and fusing appropriate
to the connected loads.
1 Technical Specifications.
1.1 Operating Environment
• Operating temperature range: 0º F to 104º F
• Operating humidity range: 0 to 90% RH.
• Control IP rating: IP30
• Pollution degree: II environment
• Control safety construction: class II
• Mains supply: 24Vac nominal, 20Vac to
28Vac actual.
• On board supply fuse: 1AT
• Rated impulse voltage: 2500V
1.2 Performance Specifications
• Operation is by Class A software and Type
1A action. Version U1
• The mains supply to the electronic circuit is
protected by a time delay fuse.
• Flame failure input: 24Vac nominal, 20Vac
to 28Vac actual. Presence of voltage
indicates flame failure.
• The burner reset relay output is either 24V
Live or Neutral which is selected by a
plug-in jumper.
• Remote volt-free switch outputs will be
24Vdc/5mA
• The built-in room temperature sensor has a
measuring range of 23.6º F to 94.6º F with a
resolution of 0.36º F.
• Temperature sensor readings can be offset
to allow for errors due to sensor tolerances
and location. NB Frost protection readings
are also affected by offsets.
Built-in and remote room temperature sensor.
Unless well ventilated, heat generated in the
controller may cause the built-in sensor to
over-read temperatures.
Remote duct temperature sensor.
1.3 SC3 MZ Electrical Specifications
The power supply is SELV isolated, therefore
low voltage wiring to the control does not need
to be mains level rated.
All relays except Vent
1 rating:
10A/24Vac resistive
2A/24Vac inductive
Vent 1 relay rating
10A/24Vac resistive
3A/24Vac inductive,
Power consumption: 5W
Communications
wiring:
Shielded twisted pair
Daisy-chain
configuration.
Belden 9841 (or
equiv) recommended.
Max length = 1650ft
0 – 10V signals
Output impedance =
500 Ohm.
Max current drive
capacity = 5mA
Measuring range: 23.6 – 94.6º F.
Resolution: 0.36º F.
Untrimmed accuracy over
range:
+/- 2.52º F.
Accuracy over range with
offset:
+/- 1.08º F.
Measuring range: 50 – 140º F.
Resolution: 0.36º F.
Accuracy over range: +/- 5.4º F.
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