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6.6 

CONDENSER HEAT 
RECOVERY MODULE (CHRM) 

The MicoFlame Grande All Stainless Steel 
CHRM is mounted in a stainless steel inner 
jacket chamber at the back of the appliance. The 
CHRM is constructed from all stainless steel 
headers and special multiple horizontal stainless 
tubes. This CHRM is designed to maximize heat 
transfer efficiency by fully condensing flue 
products and is suitable to resist the low PH of 
condensate. 
The CHRM must be supplied with adequate 
water flow at all times during operation. Do not 
operate the appliance with the CHRM piped out 
or isolated. 

The CHRM is mounted in the discharge of the 
flue products from the primary heat exchanger. 
This allows additional heat to be absorbed from 
the flue products exhausted from the 
combustion process. If isolation valves are 
provided on the CHRM, the provision of a relief 
valve at the outlet of the CHRM is 
recommended. This valve is to be sized at 
minimum for 10% of the input of the appliance 
and is to be piped to drain.  

When cold water supply with temperatures less 
than 110ºF (44ºC) passes through the CHRM it 
will cool the flue products below dew points 
resulting in the formation of condensation. 
Furthermore, the volumetric flow rate of the flue 
gases will be reduced. 

The appliance CHRM loop may be used in 
condensing mode for a variety of application 
including domestic hot water and hydronic space 
heating. Recommended piping arrangement is 
shown in Figure 3. Maximum capacity through 
the CHRM is summarized in Table 5; flows in 
excess of 60 GPM must be bypassed. 

Figure 3 – Typical Condensing System 

 

 
Condensate from the MicoFlame Grande must 
be treated before being discharged to drain. pH 
level of the condensate is to be checked 
regularly and the neutralizing medium is to be 
replaced as required. A neutralizing cartridge is 
available from the factory. The condensing 
MicoFlame Grande must be vented using only 
special venting type AL29-4C stainless steel or 
equivalent, please follow instructions detailed 
below. 

When supplied with the CHRM, the MicoFlame 
Grande is 95% efficient (category II or IV 
appliance) which requires the use of a special 
venting system fabricated from AL29-4C or 
equivalent material. Only venting components 
listed by a nationally recognized testing agency 
may be used. 

This appliance may be installed with 
conventional, sidewall or vertical venting. 
Conventional vented appliances operate with 
negative pressure in the vent pipe and require a 
special vent adapter to increase the flue outlet 
diameter. Sidewall and vertically vented 
appliances operate with positive pressure in the 
vent pipe and may be directly connected to the 
flue outlet without the use of an increaser. 
Consult the vent pipe manufacturer’s 
instructions for minimum clearances to 
combustible material for vent components. In the 
absence of instructions, the minimum clearance 
to combustible material is six inches. 

 

 

Summary of Contents for MicoFlame Grande MFH2000

Page 1: ...e WHAT TO DO IF YOU SMELL GAS o Do not try to light any appliance o Do not touch any electrical switch do not use any phone in your building o Immediately call your gas supplier from a neighbour s pho...

Page 2: ...TEMPERATURE SYSTEMS 11 7 6 INSTANTANEOUS WATER HEATER 11 7 7 HOT WATER SYSTEM PIPING 11 8 INSTRUMENTATION AND CONTROLS 15 8 1 SAFETY CONTROLS 15 8 2 CONTROL PANEL 15 8 3 CONTROL DEVICES 18 9 OPERATIO...

Page 3: ...in the copper coils or tubes is not a fault of the boiler and is not covered by warranty Consult the factory for recommendations for use in hard water areas Excessive pitting and erosion on the inside...

Page 4: ...and Applicable provisions of the local building codes The operation of exhaust fans compressors air handling units etc can rob air from the room creating a negative pressure condition leading to reve...

Page 5: ...PLY This appliance is intended to operate at inlet gas pressures not exceeding PSI 14 W C The appliance and its individual gas shut off valve must be disconnected from the supply piping when pressure...

Page 6: ...xhaust fans such as range hoods and bathroom exhausts so they will operate at maximum speed do not operate a summer exhaust fan Close fireplace dampers d Place in operation the appliance being inspect...

Page 7: ...in operation using lighting instructions provided 8 While the appliance is operating check for flue gas leaks and proper vent operation Seal any flue gas leaks using appropriate gasket or sealing mate...

Page 8: ...vent manufacturer Aluminium tape must meet the provisions of SMACNA AFTS 100 73 Standard When venting through unheated spaces with single wall vent insulation must be properly wrapped around the vent...

Page 9: ...tic hot water and hydronic space heating Recommended piping arrangement is shown in Figure 3 Maximum capacity through the CHRM is summarized in Table 5 flows in excess of 60 GPM must be bypassed Figur...

Page 10: ...st be protected from down drafts rain and debris by using a listed chimney cap Approval of the installation will be at the discretion of authorities having jurisdiction Sidewall and Vertical Venting T...

Page 11: ...isolation of the heat exchanger for servicing If the appliance is installed above radiation level it must be provided with a low water cutoff device at the time of appliance installation This applianc...

Page 12: ...e GPM flow by 15 and the head loss by 20 The following example demonstrates the procedure to follow for calculating the revised head for the heat exchanger when using a water glycol mixture Given that...

Page 13: ...tlet valve until the inlet temperature climbs to 115 F d If the inlet temperature is greater than 115 F but not greater than 140 F no further adjustment is required e Check the inlet temperature after...

Page 14: ...12 Figure 7 Typical Heating System Figure 8 Typical Low Water Temperature System...

Page 15: ...13 Figure 9 Typical Instantaneous Water System Figure 10 Typical Water Heating System...

Page 16: ...14 Figure 11 Typical Water Heating System...

Page 17: ...ell as T temperature rise 2 Six pre set modes of operation mode 1 2 4 and 5 for heating mode 3 for DHW and mode 6 for operation by a remote controller 3 Operation as an auto reset limit 4 Operation as...

Page 18: ...pliance pump based on the purge feature The control turns on the appliance pump and stages the appliance to the set point target temperature at the system temperature whenever an external heat demand...

Page 19: ...this case it is imperative that the system pump operates continuously in order to provide constant circulation past the system sensor The appliance pump then turns back on with the first stage of the...

Page 20: ...The ignition module is mounted on a rail just behind the outer jacket front access door The ignition module provide ignition sequence flame monitoring and safety shutoff for the pilot Fan Manager Ther...

Page 21: ...t one of the meter s terminals to the burner ground terminal on the S8600 and the other terminal to the burner ground wire Pilot running without main burner will generate 1 5 A average for best operat...

Page 22: ...iation for at least 1 hour Check water level in expansion tank If level exceeds of tank volume air is still trapped in system Shut down appliance and continue to run pumps Within 3 days of start up re...

Page 23: ...Fire Low Fire Three Stages Stage 3 High Fire High Fire High Fire Stage 1 Low Fire Low Fire Low Fire Stage 2 High Fire Low Fire Low Fire Stage 3 High Fire High Fire Low Fire Four Stages Stage 4 High F...

Page 24: ...ion circuit is completed between the sensor and the burner ground The flame sensing circuit in the ignition module detects the flame current shuts off the spark generator and energizes the combination...

Page 25: ...1 9 4000 1 9 2 2 1 9 2 2 1 9 2 2 1 9 2 2 FLUE SWITCH RECYCLE POINT W C MODEL Burner 1 Burner 2 Burner 3 Burner 4 2000 1 5 1 9 1 5 1 9 2500 1 1 1 5 1 1 1 5 1 1 1 5 3000 1 5 1 9 1 5 1 9 1 5 1 9 3500 1 2...

Page 26: ...he electrode does not appear overheated or fouled with carbon It may be necessary to clean the ignition electrode using steel wool Once the pilot appears to be properly set reinstall it into the appli...

Page 27: ...of sufficient water flow Under these conditions the appliance must be shut down immediately and the heat exchanger checked for damage If the exchanger is damaged from improper installation or operati...

Page 28: ...re that igniter and ground electrodes are positioned properly Clean with steel wool if necessary Verify that back of burner box is fully engaged into the retaining slot in the combustion chamber base...

Page 29: ...CTRICAL DIAGRAMS Each MicoFlame Grande appliance will be provided with its own wiring diagram to guarantee that any options ordered with the unit are properly detailed The following diagrams 99 5082 1...

Page 30: ...28...

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Page 32: ...30 16 EXPLODED VIEW MicoFlame Grande...

Page 33: ...31 17 EXPLODED VIEW MicoFlame Grande Outdoor and or Condensing...

Page 34: ...4232 14 4232 14 4232 14 4232 14 4232 23 Fan Mounting Support Right 14 4233 14 4233 14 4233 14 4233 14 4233 24 Burner Door Stop 14 4234 14 4234 14 4234 14 4234 14 4234 25 Heat Exchanger Header Stop Bar...

Page 35: ...standard warranty 2 Years six through ten replacement purchase price pro rated at the following schedule Year six 60 Year seven 65 Year eight 70 Year nine 75 Year ten 80 of the current list price of t...

Page 36: ...uilt water heaters and heating boilers as well as a into every single unit For more information supplier of specialty HVAC products Our service line is open 24 hours 7 days a week on our innovative pr...

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