10
Furnace Options
FURNACE OPTIONS
WATER HEATING COIL
ARDENT Energy furnaces are designed to heat your
domestic hot water during the heating season. The F75R and
F101 can accept 1 or two coils (1 per side). When you install
the water coil (part FCSHW4) it replaces all but one of the
firebricks on the side it is located. Please read all of the
instructions before you begin.
To install the water coil:
1. Remove the back shroud on the furnace by removing
the screws. Using a good punch and hammer, punch out
the two knockouts on the side where you would like to
install the water coil.
2. Remove all of the firebrick from that side.
3. Punch out the two knockouts at the rear of the firebox.
4. Remove the baffle plate inside the rear of the firebox.
5. Position the water coil in the firebox, in the place where
the firebrick was removed. The pipe must face the fire.
6. Install the ceramic gaskets and plates on the outside of
the firebox (not on the outside of the shroud) using the
provided drill and tap screws.
7. Replace the shroud.
CONNECTING THE COIL TO THE TANK
We recommend that you use the "two tank" system. The
first tank or "range boiler" must remain uninsulated to dissi-
pate any excess heat generated by the hot water coil.
When you connect the piping to the range boiler you must
strictly follow the diagram in figure 11. The two shut-off
valves must be no smaller than 3/4" GATE valves. Make
certain that the PRV (Watts 3L) and the P&TRV (Watts 100
XL) are installed in their respective locations and not vice
versa.
The maximum pressure setting is 38 kPa (150 psi). Do not
use less than 3/4" diameter standard pipe between the range
boiler and the furnace. The orientation of the pipe must be
slightly uphill from the coil outlet to the upper connection at
the tank. If you do no do this, vapour lock will occur, and the
water will not circulate. The minimum capacity of the range
boiler should be 100 litres (26 U.S. gallons).
DRAINING AND CLEANING
Cleaning should not normally be necessary unless the
water tends to cause deposits. If the heating efficiency
decreases noticeably, the heating coil should be inspected,
and if necessary, cleaned.
1. Let the furnace cool down.
2. Close the valves between the range boiler and the coil.
3. Open the drain valves and drain the water from the coil.
4. Disconnect the coil at the unions.
5. Clean the coil using a drain cleaning "snake."
6. Connect the piping, close the drain and open the valves
to the boiler.
WHEN YOU HAVE NO WATER
Do not operate your furnace with a dry water coil. The
excess heat will damage the water coil. If you have no water
electric,
oil or gas
thermostat
blower
limit
blower (not used)
limit
aux. limit
140° F
blower & wood
limit 250° F
damper
motor
wood
thermostat
white
black
C
W
GR
wire supplied with
harness
wire supplied by
customer
24 V
source
to blower
relay
common
from 24V
transformer
to electric
furnace relay
low voltage terminal block
16 / 2
16 / 3
16 / 4 LVT
Figure 10: Wiring diagram for typical wood - electric combination (control kit # FEFC3)
P & TRV (Watts 100XL)
PRV (Watts 3L)
1/4" gate valve
cold water in
insulate this
connecting pipe
hot
water
out
range boiler
(uninsulated)
to drain
to
drain
existing water
heater
dip
tube
1/4" union
furnace
Figure 11: Connection to hot water heater
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