Service manual

3
www.monitorproducts.com
Rear View
INTRODUCTION
Front View
2 - DESIGNATION OF COMPONENTS 1) Control Panel
2) Control Panel Cover
3) Safety Pressure Relief
Valve
4) Condenser
5) Manual Mixing Valve
6) Combustion Product
Pressure Test Point
7) Condenser Inspection Port
8) Condensate Drain
View from above
9) Drain Cock
10)Burner Air Inlet Pipe
11)Oil Burner
12)Safety Light and Reset Button
13)Sight Glass
14)Heating System Shell
15)Pockets for Water Overheating
Safety and Thermostat Bulbs
Thermostat
16)Heating Output Sensor
17)Bleed Connection
18)First Circuit Heating Output
19)Second Circuit heating output
20)Combustion Products Flue
21)First Circuit Heating Return
22)Second Circuit Heating Return
23)Well for Combustion Product
Overheating Thermostat Bulb
24)Protection Plate for Electrical
Connections Box
25)Circulating pump
26)Expansion vessel
3 - HEATING SYSTEM OPERATION
Circuit
heating
return 1or 2
2
nd
circuit
heating
output
Combustion air is drawn into the oil
burner by the burner fan through the
air intake hose connected to the
coaxial flue/combustion air intake/
exhaust separator. Heated air from
combustion of the oil burner cools as it
passes through the heating system heat
exchanger, then the secondary heat exchanger
condenser. Cooled flue products exit the unit through
the center of the flue/combustion air separator tube
assembly. Condensate from the flue products is
drained from the bottom of the condenser into the
condensate drain tube, exiting the unit through the
condensate drain system.
Water is circulated through the heating system heat
exchanger and condenser circuits where it is heated
by the combustion of the oil burner. Two independent
water-heating circuits can be connected to the unit:
• The first circuit passes through a three way
mixing valve incorporated into the heating
system. This valve can either be used manually
as supplied or driven by a motorized controller
(option).
• The second circuit can supply another heating
circuit and/or a domestic hot water indirect
storage tank such as BS DHW tanks.