Safety Precautions; Installing The Ftc Unit - Mitsubishi Electric PAC-IF081B-E Installation Manual

1. Safety precautions

1.4 Before starting the test run
CAUTION:
• Turn on the main power switch of the outdoor unit more than 12 hours
before starting operation. Starting operation immediately after turning on
the power switch can severely damage the internal parts. Keep the main
power switch turned on during the operation period.
• In heating mode, to avoid the heat emitters being damaged by
excessively hot water, set the target flow temperature to a minimum of
2ºC below the maximum allowable temperature of all the heat emitters.
For Zone 2, set the target flow temperature to a minimum of 5ºC below
the maximum allowable flow temperature of all the heat emitters.
1.5 Electric booster and immersion heaters
• FTC has signal outputs for heaters however it can not isolate power to
them in the event of overheating. All electrical heaters used on the water
circuit must have:
Abbreviations and glossary
Abbreviations/Word Description
Ambient temperature The outdoor temperature
Freeze stat. function Heating control routine to prevent water pipes freezing
Cylinder unit Indoor unvented DHW tank and component plumbing parts
Hydrobox Indoor unit housing the component plumbing parts (NO DHW tank)
DeltaT Difference in temperature between two system locations.
DHW mode Domestic Hot Water heating mode for showers, sinks, etc.
Flow temperature Temperature at which water is delivered to the primary circuit
FTC (Main) Flow temperature controller, the circuit board in charge of controlling the system, main board for multiple outdoor units control
FTC (Sub) Sub board for multiple outdoor units control
Compensation curve mode Space heating incorporating outdoor ambient temperature compensation
Heating mode Space heating through radiators or underfloor heating
Cooling mode Space cooling through radiators or underfloor cooling
Legionella Bacteria potentially found in plumbing, showers and water tanks that may cause Legionnaires disease
LP mode Legionella prevention mode – available function for systems with water tanks to prevent the growth of legionella bacteria
Packaged model Plate heat exchanger (Refrigerant - Water) in the outdoor heat pump unit
Split model Plate heat exchanger (Refrigerant - Water) in the indoor unit
TRV Thermostatic Radiator Valve – a valve on the entrance or exit of the radiator panel to control the heat output

2. Installing the FTC unit

, ,
<Fig. 2.1.1>
Main
• Before starting operation, check that all protective parts are correctly
installed. Make sure not to get injured by touching high voltage parts.
• Do not touch any switch with wet hands. There may be a risk of
electrocution.
• After stopping operation, make sure to wait at least 5 minutes before
turning off the main power. Otherwise, it may cause breakdown.
a) A thermostat to prevent overheating.
b) A non-self resetting thermal mechanism to prevent overheating.
2.1. Check the parts (Fig. 2.1.1)
The FTC unit should be supplied with the following parts.
Part name
FTC (Main) unit/FTC (Sub) unit
Thermistor (Ref. liquid temp.)
(Lead wire: 5 m/Red, Connector: 3p)
Thermistors (Flow water temp. and Return water
temp.)
(Lead wire: Gray (Flow water temp.),
Black(Return water temp.),
Connector: 4p)
Thermistors (DHW tank upper water temp. and DHW
tank lower water temp.)
(Lead wire: Blue (DHW tank upper water temp.),
Gray (DHW tank lower water temp.),
Connector: 4p)
Main remote controller cable (10 m)
Main remote controller
*1
microSD memory card
*1 A microSD memory card is installed in the unit at the factory.
Q'ty
Wiring
diagram
PAC- PAC- PAC-
symbol
IF081 IF082 IF083
1 1 1
TH2 1 ─ ─
1
1 1
THW1/2 (1.1 m/
(5 m/5 m) (5 m/5 m)
1.2 m)
THW5A/5B ─ ─ 1
1 1 1
1 1 1
1 1 1
2
en