Programming
7-day Programming
Four pre-programmed time/temperature
periods per day
Vacation programming
Programmable fan continuous in any
period
Programmable fan on/off delays
Separate set-up menus: installer menu,
service user menu, keypad lockout
(total/partial) menu
Comfort & Convenience
Large Comfort-View
TM
display and lighted
keypad
Permanent program retention - no
batteries required
Daylight Savings Time quick-change
button
Air filter change indicator
Remote sensing
(optional)
Ignition control reset
Heat pump warm air start
Performance
Multi-stage, heat pump, or single-stage up
to 3-stage heat/2-stage cool
Auto-changeover
EMR
(Energy Management Recovery)
Comfort Alert
TM
compatible System and
thermostat diagnostics
Meets Energy star specifications
Meets California Building Code, title 24
Compressor lockout/Auxiliary run time
Adjustable differential
Energy Source Optimizer selects heat
pump or fossil fuel system
Dimensions
6.9
⬙
W [175 mm] x 4.1
⬙
H [104]
x 1.3
⬙
D [33 mm]
Electrical Specifications
Rating
20 to 30 VAC, 50/60 Hz with common 0.05
to 1.5 amps per terminal
2.5 amps maximum total load (all
terminals combined)
Standard Systems
Multi-stage gas, oil, electric
Single-stage or two-stage compressor
heat pump
Humidity Specifications
Sensing Range: 2% to 97% RH
Dehumidification Setpoint Range: 40%
to 95% RH
Humidification Setpoint Range: 5% to
50% RH
Thermal Specifications
Setpoint Temperature Range: 45° to 99°F
(7° to 37°C)
Rated Differential: 0.5° to 1.5°F with
adjustable anticipation
Operating Ambient Temperature: 32° to
110°F (0° to 43°C)
Operating Humidity Range: 90%
non-condensing maximum
Shipping Temperature Range: -4° to 131°F
(-20° to 55°C)
Rheem Heating, Cooling and Water Heating 11
300-Series
We’ve Designed a Better Thermostat.
With Total Humidity Control.
The premium 300-Series uses our most powerful microprocessors, providing
increased home comfort and greater energy savings. It offers more control
and convenience features, plus the ease-of-use 300-Series thermostats are
known for. And it’s all backed up by the Rheem reputation for dependability.
RHC-TST303UNMS
MULTI-STAGE/HEAT PUMP
Programmable • 3 Heat/2 Cool • Gas/Oil/Electric • Heat Pump •
De-Humidification • Dual Fuel Capable • Hardwired
Features & Benefits
• Humidification &
dehumidification control
• Auto-changeover
• Energy management recovery
• Programmable blower
• Intuitive red/blue temperature keys
• Keypad lockout option
• Large, easy-to-see characters
• Large, lighted display
• Built-in diagnostics
B
L
SB
OT
DHM
HM
SA
R
C
Y1 Y2
Terminal Designations
E
/
W1
W2 O
G
Footprint Profile
SC
Warranty
18 months from date of purchase or 12 months from date of installation
(contact the Rheem Parts Distribution Center for more information).
Lighted
Display
Dehumidification
& Humidifier
Control
(64 Seiten)
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