102
SS-SVX11K-EN
Zone Thermostat Checkout
(Honeywell T7067)
AAvvaaiillaabbllee OOnnllyy FFoorr 2200 -- 6600 TToonn UUnniittss
1. Open the system control switches 5S1 and 5S2 to
disable the Evaporator Fan and Heating system.
2. Close the main power disconnect switch and turn
control circuit switch 1S2, in unit control panel,
“ON”.
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3. At the Zone Thermostat (6U37), use a digital
voltmeter to verify that there is 20 volts DC power
between thermostat Terminals 1 & 2. See
illustration in Installation Electrical chapter,
Thermostat Wiring section for terminal
identification. Refer to Table 29, p. 102 for the
thermostat “voltage output” ramps.
4. To check the “Cooling” output signal, place the
voltmeter leads between thermostat Terminals 1 &
4. Refer to illustration in Installation Electrical
chapter, Thermostat Wiring section and:
a. move the cooling (blue) setpoint lever from
right to left. As the cooling setpoint is lowered,
the voltage signal should increase and the
“Cooling” LED brighten.
b. move the cooling (blue) setpoint lever from left
to right. As the cooling setpoint rises, the
voltage signal should decrease and the
“Cooling” LED dim.
5. To check the “Heating” output signal, place the
voltmeter leads between thermostat Terminals 1 &
5. Refer to illustration in Installation Electrical
chapter, Thermostat Wiring section and:
a. move the heating (red) setpoint lever from left
to right. As the heating setpoint rises, the
voltage signal should increase and the
“Heating” LED brighten.
b. move the heating (red) setpoint lever form right
to left. As the heating setpoint lowers, the
voltage signal should decrease and the
“Heating” LED dim.
Table 29. Zone thermostat (6U37) “voltage output” ramps
1U11 Function
Nominal Operating Points and Throttling Ranges
Measured between
1U11 Terminals
Pull-In Voltage
(a)
(VDC)
Drop-Out Voltage
(a)
(VDC) Throttling Range
HEAT 1
(a)
4.63 4.0
Terminal 5 (heating) &
Terminal 1 (common)
HEAT 2
(a)
5.88 5.25
HEAT 3
(a)
7.13 6.50
HEAT 4
(a)Zone Thermostat
T7067
8.38 7.75
COOL 1 4.58 - 5.42 3.44 - 4.56
Terminal 4 (cooling) &
Terminal 1 (common)
COOL 2 5.43 - 6.34 4.69 - 5.81
COOL 3 6.63 - 7.63 5.90 - 7.10
COOL 4 7.84 - 8.92 7.11 - 8.39
Economizer 2.75 - 4.00
(a)
"Pull-In" and "Drop-Out" values are ± 0.25 VDC
Discharge Air Sensor Checkout
(Honeywell 6RT1)
AAvvaaiillaabbllee OOnnllyy FFoorr 2200 -- 6600 TToonn UUnniittss
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