Carrier 33CSSN2-MH Installation Instructions Manual page 2

Fig. 3 — Mount Relay Assembly on the
Right Side of the Control Box
Wire in Second Fan Speed Control Relay
1. Remove the Gray fan speed selector wire by disconnect-
ing it from the J2 terminal next to relay K3 on the PCB
(printed circuit board) and the fan speed selector switch.
See Fig. 4.
NOTE: The gray wire will either be connected to a rotary fan
speed selector switch on top of the control box OR a rocker fan
speed selector switch (as shown in Fig. 4) on the front of the
control box cover.
2. Attach gray wire from relay assembly to terminal J2 next
to relay K3 on the PCB. See Fig. 4.
3. Remove the black fan wire from Fan Speed Selector
Switch (Rotary or Rocker) and re-attach to terminal 4 on
the relay assembly. See Fig. 4 and 5.
4. Remove the red fan wire from Fan Speed Selector Switch
(Rotary or Rocker) and re-attach to terminal 6 on the re-
lay assembly. See Fig. 4 and 5.
5. Remove Fan Speed Selector Switch.
For Wall Thermostat Units that have fan speed control
from a rotary fan speed selector switch on top of the con-
trol box cover:
• Remove the knob and rotary fan speed selector
switch from the control box cover by removing the
2 screws located under the knob shown in Fig. 2
and discard.
For Wall Thermostat Units that have fan speed control
from a rocker fan speed selector switch on the front of the
control box cover:
• Remove the Rocker fan speed selector switch from
the control cover and replace with the plastic rect-
angular plug provided in the relay kit. See Fig. 2
and 6.
6. Remove the black wire from L1 on relay K1.
7. Attach black wire from terminal 2 of relay assembly
(with goal post terminal) to L1 on relay K1.
8. Re-attach black wire (removed in step 6 above) to open
goal post terminal of L1 on relay K1. see Fig. 4 and 5.
9. Attach green ground wire from terminal 1 of the relay as-
sembly (with piggy back male terminal) to green ground
wire attached to the PE terminal on corner of PCB.
Attach both wires back on to the PE terminal on corner of
PCB. See Fig 7.
10. The blue wire connected to terminal 3 on the relay assem-
bly is the second fan speed signal wire, for connection to
the thermostat. The blue wire has a quick connect/discon-
nect terminal for easy disconnect and removal of the unit.
Route the blue wire out of the control box opening where
the terminal access cover was removed. See Fig. 8.
11. Dress wires using wire ties provided.
12. Close the control box door and secure by re-attaching
screws saved earlier (take care not to pinch any of the
wires when the control box cover is closed).
J2
TERMINAL
BLACK FAN
WIRE
GRAY FAN SPEED
SELECTOR WIRE
Fig. 4 — Fan Speed Selector Wire
2
5
1
Fig. 5 — Relay Assembly Connections
Fig. 6 — Remove Fan Speed Selector Switch
2
RED FAN
WIRE
FAN SPEED
SELECTOR
SWITCH
(ROCKER STYLE)
4
2 4
6
5 6
1 3
3
ROCKER STYLE FAN SPEED
SELECTOR SWITCH
BLACK
WIRE AT
L1 ON K1