CONTROL WIRING SOLUTIONS FOR VARIOUS HVAC SYSTEMS
Additional diagram shown on page 7.
FIG. 6 | Heat Only System and |
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| Steam Humidifier with standard |
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| dry contact HumidistatS2000 & S2020 Humidifier |
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Heat only | Low Voltage Terminal Block |
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Thermostat | G1 R G2 H | H | A | A | |
R | W | ||||
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| Factory |
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| Jumper will | |
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| stay in place | |
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| unless a field | |
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| installed Air | |
R | W G |
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| Proving Device | |
Dry Contact | is used. |
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Typi ca l |
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Furnace | Humidistat |
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| 062000 Humidistat |
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FIG. 8 | Bryant/Carrier Evolution/Infinity | NOTE: An APD or similar device |
Wire the APD in series with the HH | ||
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| Variable Speed Heat/Cool System | circuit. |
FIG. 7 | Conventional Heat & Cool System |
and Steam Humidifier with 072000 |
Typical Thermostat | S2000 & S2020 Humidifier |
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Low Voltage Terminal Block | A | |||
R W G Y C | G1 R G2 H | H | A | |
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| REMOVE |
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| FACTORY | |
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| JUMPER |
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R W G Y C |
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| Model APD or | |
Typical Furnace |
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| Equivalent |
TemperatureOutdoor | OD OD C R H H |
Sensor | 072000 Humidistat |
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Refer to the 072000 Technical Bulletin
FIG. 9 | Heat Pump System and Steam Humidifier |
| Bryant |
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| Program Evolution | ||||||
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| Evolution |
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| 1.Heating airflow | ||||||||
| Thermostat | D | To Efficiency mode. | |||||||||
| A | B | C | 2.Humidifer | ||||||||
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| installed=Yes | |||
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| 3.Humidify with | |||
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| Fan=Yes | |||
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| 4. Set FAN to | |||
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| Continuous Mode & | |||
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| select MEDIUM | |||
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| speed. | |||
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| HUM |
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| A | B | C | D |
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| Bryant Evolution |
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| Furnace |
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2 4 v a c Common
S2000 & S2020 Humidifier
Low Voltage Terminal Block
G1 | R G2 | H | H | A | A |
DO NOT USE |
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| Leave Factory | ||
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| Jumper in Place | |||
| SPST Dry Contact |
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| Isolating Relay |
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| with 24vac Coil |
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Model APD or
Equivalent
with 072000 Humidistat |
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| S2000 & S2020 Humidifier |
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Typical Heat Pump | Low Voltage Terminal Block |
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Thermostat |
| G1 R G2 | H H | A | A |
O R W2 G Y C | |||||
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| REMOVE |
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| FACTORY | |
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| JUMPER |
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O R W2 G Y | C |
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| Model APD or | |
Typical Air Handler |
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| Outdoor | OD OD C R | H H | Equivalent | |
Outdoor Heat Pump | Temperature |
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Sensor |
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not shown for clarity |
| 072000 Humidistat |
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FIG. 10 | Heat Pump System and Steam Humidifier with |
| Combo Thermostat/Humidistat |
| and Isolating Relay |
Thermostat with | S2000 & S2020 Humidifier |
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Low Voltage Terminal Block |
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Humidification Control | G1 R G2 H | H | A | A | |
O R W2 G Y C H | |||||
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| REMOVE |
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| FACTORY | |
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| JUMPER |
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O R W2 G | Y C | SPST Dry Contact |
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Isolating Relay |
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with 24vac Coil |
| Model APD or | |||
Typical Air Handler |
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| Equivalent |
Outdoor Heat Pump not shown for clarity
FIG. 11 | S2000 & S2020 Humidifier | Disconnect the wires from the “A” |
| terminals and check the device & circuit | |
| Low Voltage Terminal Block | with a reliable ohm meter. Check continuity |
| G1 R G2 H H A A | when the fan is off and when it is running. |
00.3OHM | Model APD current |
| sensing switch or |
| equivalent air proving |
| device. Dry Contacts Close |
| when fan is running! |
Refer to the 072000 Technical Bulletin |
The latest improvement to the Field Controls humidifiers is the new “Airflow Interlock Feature” provided on the low voltage terminal blower on the HVAC system does not operate when called block. Due to popular demand we have made it easier for you to achieve fail safe lockout in the event the fan or blower on the HVAC system does not operate when called upon. A high humidity or airflow proving device is necessary.
You must still determine the type of proving device you want to use. We recommend our new Model APD switch. But then all you have to do is connect two low voltage wires from your air proving device straight to the Steam Humidifier’s “A” terminals. No additional field relays or components are needed.
operating the blower on the HVAC system. If the Steam Humidifier detects a loss of airflow longer than 1 minute, it will The Steam Humidifier monitors the airflow circuit anytime it is shutdown the heating element and stop producing steam to operating the blower on the HVAC system. If the Steam Humidifier detects a loss of airflow longer than 1 minute, it will shutdown the heating element and stop producing eam to avoid saturating the duct.
You must test the air proving device when you install it to make sure it will function properly. WARNING: DO NOT perform this test with the wires connected to the Steam Humidifier. Temporarily disconnectacross thethemnormally. Referopento Figurecontacts11.with the fan/blower running.
fan/blower is running.
1.After installing the air proving device, test for continuity across the normally open contacts with the fan/blower off. You should read infinity (no continuity) when the fan/blower is off.
2.Turn on the fan/blower at the thermostat and test for continuity across the normally open contacts with the fan/blower running. You should now read continuity (a complete circuit) when the fan/blower is running.
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