Filling Outdoor Furnace With Water And Purging Air - Central Boiler e-Classic 1450 IR Owner's Manual

FILLING OUTDOOR FURNACE WITH WATER
AND PURGING AIR
NOTE: The items referred to in this procedure
correspond to the items in Fig. 35. Refer to Fig.
35 when performing these steps.
All air must be purged from the water lines when filling
the system. Also, the circulation pump(s) must be
installed in the hot supply line(s).
NOTE: If using the valve on the water heater to
fill the outdoor furnace, flush the water heater
to remove all sediment before filling the outdoor
furnace.
NOTE: If the outdoor furnace is being filled with
water when the temperature is below freezing,
circulate the water immediately after filling to
prevent freezing the water lines.
NOTE: Be sure to fill the outdoor furnace with
water of good quality (softened water, if possible).
See Water Quality and Maintenance section.
Use the procedure in this section to fill the outdoor
furnace with water and purge the air from the system.
All valves in the outdoor furnace system that allow
circulation through each circuit should be open before
starting. Perform this procedure on each pump circuit
from the outdoor furnace.
Fig. 35
Filling Outdoor Furnace and Purging Air
Using Pressurized Domestic Water
NOTE
Outdoor furnace water temp
setpoint should be set at
185˚F (85˚C) minimum.
NOTE
A pump must be installed in the hot
supply line between the outdoor furnace
and thermostatic valve.
Valve #4
Thermostatic
Valve
Valve #3
Valve #5
Hot
Supply
Return Line
30
Valve #1
Bypass
Line
Valve #2
NOTE: For illustration purposes only.
NOTE: Add Corrosion Inhibitor Plus™ (p/n 1650)
through the 2-inch vent pipe on the outdoor
furnace before filling with water to immediately
begin to protect the steel.
1. Connect the male end of garden hose A to valve #1
using the backflow preventer and two 3/4" female
hose x 3/4" male pipe adapters (p/n 4928). Connect
the female end of the garden hose to valve #2.
2. Close the valves on the hot supply and return lines of
the outdoor furnace.
3. Close valve #4 and valve #5.
4. Open valve #1 and valve #2. This step begins filling
the system with domestic water and purging the hot
supply line and thermostatic valve.
5. Remove cap from valve #3 and open valve #3
slightly to purge air from valve body. Close valve #3
when air is purged.
6. Open valve #5.
7. Open the valve on the hot supply line of the outdoor
furnace for 5 minutes; then close the valve. Water
will purge air from the hot supply line. The valve and
attached fittings on the outdoor furnace will become
cold as water starts filling into outdoor furnace.
Backflow
Preventer
M
R
Hot
C
H
Supply
1" Central
Valve #6
(Seasonal Manual
Bypass Valve)
Water
Heater
Hose A
Actual configuration may vary.
Plenum
Forced Air
Furnace
PEX
®
NOTE
Installer must comply with
all applicable codes and
regulations.
© 2015 Central Boiler
Section 1 - Outdoor Furnace Installation