Delta PG PLUS-25 Operations Instructions download pdf (Page 66)

60

Maintenance Procedures

Check Combustion/ Ventilation A i r O p e n i n g s

Verify that all combustion air and ventila-

tion openings to the mechanical room or

building are open and unobstructed. Check

the operation and wiring of any automatic

ventilation dampers.

Check and verify the vent discharge and the

combustion air intake are free of debris and

obstructions.

Inspect Vent System and Combustion Air

Piping

Visually inspect the venting system and

combustion air piping (if installed) for

blockage, deterioration or leakage. Repair

any vent joints that show signs of deterio-

ration as per the vent manufacturer’s

instructions.

When combustion air is ducted to the unit,

verify that the air inlet piping is connected

and sealed. Inspect the air hose connecting

the air inlet adapter to the venturi elbow for

deterioration.

Failure to inspect the vent system and

combustion air inlet piping and have any

conditions repaired can result in severe

personal injury or death.

Check Primary System

Verify all system components are correctly

installed and operating correctly.

Check the cold fill pressure for the system,

typical cold water fill pressure is 12 psig.

Verify the system pressure as the unit oper-

ates at high temperature to ensure the pres-

sure does not exceed 25 psig. Excessive

pressure reading indicates expansion tank

sizing is incorrect or system performance

p r o b l e m s .

Inspect air vent and air separators in the

system. Remove the caps on automatic air

vents and briefly depress the valve stem to

flush vent. Replace the cap when complet-

ed. Ensure vents do not leak, replace any

leaking vents.

Check Domestic System

Verify all system components are correctly

installed and operating correctly.

Check the outlet domestic temperature of

the mixing valve and compare with the

recorded temperature made during start-up.

Check Expansion Tank

Refer to Section V - Primary Piping for

recommended location of the expansion

tank and air eliminators.

Close -Type Tank:

- Ensure tank is partially filled with

water leaving an air gap as a cushion.

Refer to the manufacturer’s instruction

for proper fill level.

- Ensure the tank is fitted with a device

that reduces gravity circulation of air-

saturated tank water back into the sys-

tem. This device prevents air from

bubbling up through the water as it

returns from the system.

- Ensure no automatic air vents are used

in the system. This will allow air to

escape from the system instead of

returning to the tank.

Diaphragm Tank:

- Ensure the system contains a minimum

of one automatic air vent. Preferred

location of the air vent should be atop

an air eliminator.

- Remove the tank from the system and

check the charge pressure. For residen-

tial applications the charge pressure is

typically 12 psig. If tank does not hold

a charge pressure, then the membrane is

damaged and the tank should be

replaced.

WARNING

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