Float Switch; Wiring Instructions - Aprilaire 1730A Installation Instructions Manual

FLOAT SWITCH

If the dehumidifier is installed in an attic or an area requiring leak
protection, the unit must be placed in a drain pan with a normally
closed condensate overflow safety switch (float switch). The float
switch should be wired to the FLOAT SWITCH terminals on the circuit
board on the outlet panel (See Figure 12). The compressor is disabled
when the float switch is open.

WIRING INSTRUCTIONS

1. Remove wiring access panel on the outlet panel.
2. Unplug the FLOAT SWITCH terminals and remove the jumper.
3. Run a 2-wire cable from the dehumidifier to the float switch.
4. Wire float switch to FLOAT SWITCH terminals and plug the
terminals back into circuit board (Figure 12).
5. Replace the wiring access panel.
START UP/SySTEM CHECKOUT
1. Check the wiring and restore power to the HVAC equipment (if
applicable).
2. Plug in the dehumidifier and turn on/off switch ON.
3. Check LED indicators located below the wiring access panel. Verify
the green LED is on. The green LED is on when power is applied to
the system.
4. Rotate the dehumidistat knob fully clockwise to ON position.
5. If setup is correct, the dehumidifier blower, and HVAC fan
(if applicable) will turn on. The compressor will turn on after
the dehumidifier blower has run for 3 minutes. Refer to the
TROUBLESHOOTING GUIDE if the dehumidifier blower and/or
compressor do not activate.
6. Check LED indicators. Green should remain on. If Red LED is on,
refer to the TROUBLESHOOTING GUIDE. The red LED turns on
when a fault condition is active. Possible fault conditions include
open float switch or open high temperature switch.
7. After verifying operation, rotate the dehumidistat knob counter-
clockwise to set the dehumidifier to the desired dryness level.
Start at 3 for most installations. Moving the knob towards "MORE
DRY" will increase the amount of time the dehumidifier runs,
making conditions dryer. Moving the knob towards "LESS DRY"
reduces the amount of time the dehumidifier runs, allowing for
higher humidity levels. See Figure 13 for knob setpoints and
corresponding %RH levels (+/- 6% RH).
6
FIGURE 12 – Wiring to Float Switch
LOW VOLTAGE
NORMALLY CLOSED
FLOAT SWITCH
FIGURE 13 – Dehumidistat Setpoints
30%
42%
FLOAT
SWITCH
90-1429
80%
67%
55%
90-1430