Aprilaire 720 Series - Page 7

MAINTENANCE INSTRUCTIONS CONT.
I
J
K
L
H
G
E
C
F
A
B
D
VALVE
ASSEMBLY
1. Remove cover (A) by depressing latch (B) and pulling
away from base (C). Remove HydroCore (D) then
brush away any mineral deposits from the base.
2. Plug the drain port (E) or raise the end of the flexible drain
line (F) above the valve and secure to create a trap.
3. Pour white vinegar into the valve cup (G) up to the
clean line (H). Soak for up to 30 minutes.
4. Use a small plastic bristle brush to remove buildup in the
valve cup then drain vinegar solution. Flush with water.
5. Replace the rubber seal cap (I) and orifice (J) assembly
(PN: 70000037). See Orifice Replacement Instructions.
6. If applicable, remove the drain line and flex it to loosen
any mineral deposits or blockages then flush with water.
If it does not clear, replace it. Reattach drain line,
ensuring it has a constant downward slope and is not
flattened or blocked.
7. Install fresh HydroCore and test to confirm proper
function.
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
NOTE: Inlet strainer is designed to last for the life of the solenoid valve assembly and should not be removed from the water inlet (L).
Hard Water
Installation
*
Soft or Softened
Water Installation
*
Replace the orifice and clean the valve
every 3 years or as needed based on usage.
Annual replacement of the orifice and cleaning of the
valve is required to maintain optimal performance.
*To determine water connection, trace the water inlet (L) back to the water source to see if it is connected to a softener or contact your
service technician. Itchy skin, poor soap lather, and mineral residue or buildup on faucets or appliances are signs of hard water.
Contact AprilAire
Technical Support
for details:
800.334.6011
Orifice Replacement Instructions
1. Remove rubber seal cap (I) from the orifice (J).
2. Using an 11/16" socket or adjustable wrench, turn the orifice counterclockwise
to carefully loosen and remove it from the valve assembly. Ensure no debris
enters the orifice cavity (K).
3. Insert the new orifice, turn clockwise to tighten (finger-tight plus 1/8 to 1/4
turn-do not over-tighten), and press the rubber seal cap onto the orifice.
REQUIRED ANNUALLY FOR HARD WATER
(Included with Hard
Water Kit)
WARNING: Take note of humidier control set point and turn dial to off position before starting.
COVER
LATCH
BASE
HYDROCORE L
DRAIN PORT
DRAIN LINE
VALVE CUP
CLEAN LINE
RUBBER SEAL CAP
ORIFICE
ORIFICE CAVITY
WATER INLET
English 7