Replacing The Thermostat On The Subbase - Robertshaw 300 Installation & Programming Manual

You may also lock the cover down to prevent unauthorized access to the thermostat by adding the
clear plastic lock (included in the installation bag). To install, remove the thermostat from the
subbase and place the clear plastic lock in the subbase as shown below. Replace the thermostat
and close the cover. The cover is now locked. To open, simply use a screwdriver to push the lock
back, allowing the cover to open. To remove the lock, open the cover, remove the thermostat from
the subbase, then remove the lock.

REPLACING THE THERMOSTAT ON THE SUBBASE

1. Position the thermostat on the hinged tabs located at the top of the subbase.
2. Gently swing the thermostat down and press on the bottom center edge until it snaps in place.
TERMINAL FUNCTIONS - 300-224
OUTPUT
Rsz
cl
RSl
R&V
r
0
m&224
B
OFF ON
min. (on/off) 2 min. (on/off)
4
Locked
Unlocked
Electric Gas
12
R H . . . . . . . . . . . . . 24VAC supply from heating
W . . . . . . . . . . . . . . . Energizes the heating equipment
with a call for heating
RC . . . . . . . . . . . . . 24VAC supply from cooling
Y . . . . . . . . . . . . . . . . Energizes the cooling equipment
with a call for cooling
G . . . . . . . . . . . . . . . Fan is energized with a call for Heating
or Cooling or selected by pressing the
Fan button Heating mode.
RS2 . . . . . . . . . . . Use to connect Outdoor
RSl Temperature Sensor and/or
RS+V Indoor Remote Sensor Options.
Refer to the instructions included
with the sensors.
Equipment load resistors(proivided) may be required
on the W, Y and G switching circuits if the equipment
loads do not draw ,080 amps.
Connect load resistors at the equipment.
'See important installer's note on page 38 and 39.
74
WIRING DIAGRAM - 300-224
I
RH
Rs2
r-l
W
RSl
RS+V RC
Y
G
300-224
WIRING DIAGRAM - 300-225
Wi
Yl
G
RS2
R
RSl
RS+V 24V
24vo
I
Note 2
Line
Voltage
13
Note 1: If jumper removed, a
separate transformer must be used to
power the loads.
Note 2: This thermostat may be used
with 24 Volt DC. The negative side of
the DC supply must be wired to the
24V (C) terminal.
Note 1
24 VAC
Transformer
15