2
INSTALLATION
PROCEDURE 1 — MOUNT THERMOSTAT
Make sure all power to unit is turned off
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position and
install a lockout tag. There may be more than 1 disconnect
switch. Lock out and tag switch with a suitable warning label.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
Exercise extreme caution when drilling holes. Do not puncture
coil and/or tubing.
CAUTION
!
1. Remove knockout in bottom of electrical box.
2. Drill two 3/16- inch diameter clearance holes in right- hand
side of electrical box, 1- inch apart. Position holes in side of
box to ensure clearances for mounting of thermostat. (See
Fig. 1.)
3. From within box, pass Evaporator Freeze Thermostat bulb
through knockout hole.
Do not mount thermostat to box
at this time.
4. Attach Evaporator Freeze Thermostat bulb to vapor line,
using two wire ties, as close to evaporator coil as possible.
(See Fig. 1.)
5. Position electrical box on side of plenum or coil casing. Be
sure location is NOT near coil surface. Drill two 9/64 or no.
27 holes through holes provided in electrical box into plen-
um or casing.
6. Mount electrical box to plenum or casing using two No.10,
24x1/2- inch sheet metal screws. (See Fig. 1.)
7. Mount Evaporator Freeze Thermostat to side of electrical
box using two No. 8, 32x1/2- inch sheet metal screws.
8. Route wires for bulb through knockout hole in electrical
box and connect to Evaporator Freeze Thermostat.
9. Wire Evaporator Freeze Thermostat in series with Y
(single- stage) or Y1 (two- stage) low- voltage wire from in-
door thermostat at indoor unit, to outdoor unit. (See Fig. 2
through 5.)
10. Secure cover to electrical box.
11. Insulate Evaporator Freeze Thermostat bulb.
3
⁄
16
-IN.
HOLES
TO CONTROL
WIRING
A97510
Fig. 1- Mounting Thermostat on Coil Casing
