7
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 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 30: ...28...
Page 31: ...29...
Page 32: ...30 16 EXPLODED VIEW MicoFlame Grande...
Page 33: ...31 17 EXPLODED VIEW MicoFlame Grande Outdoor and or Condensing...
