PeerlessBoilers MI-03, Installation & Maintenance Manual

A. GENERAL

1.  Disconnect this boiler from the gas supply piping

during any pressure testing of the gas system.

2. Check pipes adjacent to cold walls or in unheated

spaces. Insulate and tape them if necessary to be
sure they can’t freeze up. Keeping the water moving
at all times will reduce the likelihood of freezing. See
Section 3 for glycol instructions.

3. If there is considerable foreign matter in the boiler

water, the boiler should be shut down and allowed to
cool, then drained and thoroughly flushed out. Use
the drain valve at the bottom of the return
connection to drain the boiler. Pipe the drain cock to
a suitable drain or containment device if a glycol
solution is used. Flush the system to remove
remaining matter. If there is evidence that hard scale
has formed on the internal surfaces, the boiler
should be cleaned by chemical means as prescribed
by a qualified water treatment specialist.

4. There must not be signs of continuous wetness at the

chimney. If signs of continuous wetness are
observed, a qualified service agency must be
consulted to modify the vent configuration to prevent
the formation of condensate.

B. DAILY (WITH BOILER IN USE)

Daily boiler observation can be performed by the owner.
If any potential problems are found, a qualified installer
or service technician/agency must be notified.

1. Remove any combustible materials, gasoline and

other flammable liquids and substances that generate
flammable vapors from the area where the boiler is
contained. Make certain that the boiler area has
ample air for combustion and ventilation and that
there are no obstructions to the free flow of air to
and from the boiler.

2. Observe general boiler conditions (unusual noises,

vibrations, etc.)

3. Observe operating temperature and pressure on the

combination gauge located on the left side of the
boiler. Boiler pressure should never be higher than
5 psi 

(

35 kPa) below the rating shown on the safety

relief valve; 25 psig 

(

172 kPa) maximum for a 30

psig 

(

207 kPa) rating, 45 psig 

(

310 kPa) maximum

for a 50 psig 

(

345 kPa) rating). The valve rating can

be found on the top of the safety relief valve (see
Figure 5 for location of the safety relief valve). 
Boiler temperature should never be higher than
250°F (121°C).

4. Check for water leaks in boiler and system piping.

5. Smell around the appliance area for gas. If you smell

gas, follow the procedure listed in the
Lighting/Operating Instructions in Section 7.

C. WEEKLY (WITH BOILER IN USE)

1. Flush float-type low-water cut-off (if used) to remove

sediment from the float bowl as stated in the
manufacturer’s instructions.

D. MONTHLY (WITH BOILER IN USE)

1. Check boiler room floor drains for proper

functioning.

2. Check function of the safety relief valve (monthly

unless specified otherwise by manufacturer) by
performing the following test:

a. Check valve piping to determine that it is

properly installed and supported.

b. Check boiler operating temperature and pressure.

c. Lift the try lever on the safety relief valve to the

full open position and hold it for at least five
seconds or until clean water is discharged.

d. Release the try lever and allow the valve to close.

If the valve leaks, operate the lever two or three
times to clear the valve seat of foreign matter. It
may take some time to determine if the valve has
shut completely.

e. If the valve continues to leak, it must be replaced

before the boiler is returned to operation.

f.

Check that operating pressure and temperature
have returned to normal.

g. Check again to confirm that valve has closed

completely and is not leaking.

3. Test low-water cut-off (if used) as described by the

manufacturer.

4. Test limit as described in Section 7F, “Check-Out

Procedure.”

5. Test function of gas safety shut-off features as

described by gas valve and ignition control
manufacturer.

6. Cycle the boiler at least once and check operation of

the vent damper.

MAINTENANCE

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