Delta F-25 User Manual download pdf (Page 44)

39

Start-Up Preparation

3. Fill the outer tank to correct system

pressure. Correct pressure will vary

with each application.

Typical residential system fill pressure is

12 psi. System pressure will increase

when system temperature increases.

Operating pressure of the system should

never exceed 25 psi.

4. Allow air to escape from the outer tank by

opening the automatic air vent provided

with the ELITE.

5. Purge air in each zone of the primary sys-

tem through the purge valve. Open air

vents to allow air to be purged in the zones.

6. Once the system is completely filled and

purged of all air, check the system pressure

and check for leaks.

Check Low Water Cut-Off Device

- The ELITE is provided with a factory

installed Low Water Cut-Off device

that measures system pressure of more

than 10 psi.

- Remove the front jacket panel and

check for continuity across the low

water cut-off device wire terminals.

The contacts should be closed when sys-

tem pressure is greater than 10 psi.

Check For Gas Leaks (if applicable)

Prior to start-up and during initial oper-

ation, smell near the floor and around the

unit for gas odorant or any unusual odor.

Do not proceed with the start-up if there

is any indication of a gas leak. Any leaks

found must be repaired immediately.

Propane installations only - The propane

supplier mixes an odorant with the

propane to make its presence detectable.

In some cases the odorant can fade and

the gas may no longer have an odor.

Prior to start-up of the unit and period-

ically after start-up have the propane

supplier check and verify the odorant

level.

Check Thermostat Circuit

- Unplug the Room Thermostat Snap-set

located on the rear of the unit.

- Connect a voltmeter across the end ter-

minals of the male half of the Room

Thermostat Snap-set.

- Close each thermostat, zone valve and

relay in the external circuit one zone at

a time and check the voltage reading

across the plug.

- There should NEVER be voltage mea-

sured at the plug.

- If voltage is measured at the plug under

any condition, check and correct the

external wiring.

In systems using 3-wire zone valves

backfeed of voltage to the unit is a com-

mon problem. Use an isolation relay to

prevent voltage from the external circuit

entering the Room Thermostat Snap-

set.

NOTICE

WARNING

WARNING

NOTICE

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