Delta F-25 - Manual (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