Camus Hydronics DMC103 Service Manual download pdf (Page 10)

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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.

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