RT-SVX056D-GB
36
Burner module
PCH : premix burner with a condensing heat exchanger
Figure 35 - Modulating (PCH) gas valves and variable
speed combustion blower
Flue gas
outlet
Condensate water
Drain pipe on PCH not on PRH
Natural Gas (G20 / G25)
Or LPG (G31)
Air
HX + combustion chamber
100% stainless steel
Modulating (PCH) or staged (PRH) gas valves
& variable speed combustion blower
Energy Recovery Circuit (ERC)
The ERC consists of an additional refrigeration circuit
which recovers the energy in the exhaust air to pre-
heat or pre-cooled the fresh air. The ERC includes a
compressor, heat exchanger coils and exhaust fan.
Figure 36 - Heating mode
RETURN AIR
EXHAUST
AIR
FRESH
AIR
HEATING MODE
SUPPLY AIR
« Recovery » coil (Condenser)
« Exhaust » coil (Evaporator)
Hot air coming from the building causes refrigerant
evaporation in the “exhaust” coil. Then refrigerant is
compressed and conveyed to “Recovery “ coil and mix
air is preheated through refrigerant condensation in
“Recovery” coil.
Figure 37 - Cooling mode
RETURN AIR
EXHAUST
AIR
FRESH
AIR
COOLING MODE
SUPPLY AIR
« Exhaust » coil (Condenser)
« Recovery » coil (Evaporator)
Cold air coming form the building causes refrigerant
condensation in the “Exhaust” coil, then refrigerant
is expanded and conveyed to “Recovery” coil. Mix
air is precooled through refrigerant evaporation in
“Recovery” coil.
Figure 38 - Thermodynamic heat recovery
Compressor
«Recovery» Coil
«Exhaust» Coil
TXV (Thermostatic
eXpansion Valve)
4 Way Valve
Filter/Drier
HP switch
HP/LP sensor
Exhaust Fans
Barometric
Dampers
Assembly procedure of fan block
All ERC specific electrical components are located in the
electrical box. Electrical connections of exhaust fan must
be performed on site.
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