Digital Thermostat Model 2H2C Two Stage; Specifications; Wiring Requirements For Atwood (Only) Two Stage Thermostat - Atwood AFS Series Training Manual

DIGITAL THERMOSTAT MODEL 2H2C Two Stage

This thermostat has been designed to operate standard air conditioning units in conjunction with an Atwood (only) Two
Stage RV furnace.

Specifications

Operating Voltage
Current Consumption at 12 VDC
Operating Temperature
Room Temperature Range
Room Temperature Display Range
Thermostat Accuracy
Switching Capability A/C
Thermostat Installation
1. Thermostat is very sensitive. HANDLE WITH CARE AT ALL TIMES.
2. Locate thermostat 48" to 54" above main floor level on an INTERIOR wall. Pick a dry area where air circulation is good.
EXTERIOR wall location must have a ¾" spacer between thermostat and exterior wall.
3. Be sure all electrical power has been disconnected from the air conditioner, furnace and the power supply.
4. Do not install the thermostat where there are unusual heating conditions: such as direct sunlight, heat producing
appliances (television, radio, wall lamp, etc.) or a furnace or air conditioner supply register.
ATTACHING THE WALL THERMOSTAT
1. Separate the thermostat body from the sub-base by gently squeezing the top and bottom, connecting wiring per
requirements. Attach thermostat sub-base to the wall at desired mounting location.
SYSTEM SLIDE SWITCH
LEFT RIGHT
COOL OFF HEAT FAN
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COOL OFF HEAT FAN
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COOL OFF HEAT FAN
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COOL OFF HEAT FAN
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WIRING REQUIREMENTS FOR ATWOOD (ONLY) TWO STAGE THERMOSTAT

12 VDC ANALOG A/C SYSTEMS (RVP®)
THERMOSTAT WIRE FROM
terminal # (L-R) FURNACE
FUNCTION
1 -12 Vdc
ground
2 Not Used
3 use jumper +12 Vdc
between 3 & 4
4
5
6
7
8 Furnace
Thermostat
9 VDC to 18 VDC
100mA
-40°F to +185°F
+55°F to +90°F
+35°F to +99°F
+/- 1°F
Up to 24 VAC (max. 2 amps)
Scroll Order Of Displayed
Modes
AU
HI
LO
HF
LF
Scroll Order Of Displayed
Modes
AU
HI
LO
HF
LF
Scroll Order Of Displayed
Modes
HI
LO
Scroll Order Of Displayed
Modes
OF
WIRE FROM THERMOSTAT
A/C TERMINAL #
FUNCTION
Not Used
A/C
Compressor
High Fan
Low Fan
OPERATIONS
Furnace Operations
Furnace automatically switches between high and low BTU valve and high
and low speed fan when cycling to satisfy set point.
Furnace high BTU valve and low speed furnace fan cycle to satisfy set point.
Furnace low BTU valve and low speed furnace fan cycle to satisfy set point.
Furnace fan runs at high speed to circulate air. Air conditioner fan does not
run.
Furnace fan runs at low speed to circulate air. Air conditioner fan does not
run.
Air Conditioner Operation
Air conditioner automatically switches compressor and high and low speed
fan when cycling to satisfy set point.
Air conditioner compressor and high speed fan operate to satisfy set point.
Air conditioner compressor and low speed fan operate to satisfy set point.
Air conditioner fan runs at high speed to circulate air. Furnace fan does not
run.
Air conditioner fan runs at low speed to circulate air. Furnace fan does not
run.
Fan Operation
Air conditioner fan and furnace fan run at high speed to circulate air.
Air conditioner fan and furnace fan run at low speed to circulate air.
OFF
7.5 VDC ANALOG A/C SYSTEMS (DOMETIC®)
WIRE FROM
FURNACE FUNCTION
(L-R)
1 -12 Vdc ground
2 Not Used
3 +12 Vdc
4
5
6
7
8 Furnace Thermostat
29
WIRE FROM A/C
FUNCTION
7.5 Vdc
A/C Compressor
High Fan
Low Fan