McQuay FCVC, Руководство по установке и обслуживанию

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Page 52 IM 1015
Thermostat Operation
These thermostats are designed to control On-Off, N.O. and
N.C. valves, relays and Erie® three wire floating valves. These
units may include a fan switch with one or more fan speed
selections.
Mode Button Operation
OFF: All thermostat outputs are off, fan is still operational if
connected to manual fan speed switch.
AUTO: The thermostat automatically selects heating or
cooling mode depending on the set point and room
temperature. The appropriate HEAT or COOL indicator is
enabled in addition to AUTO. A 3°F dead-band is provided to
prevent short cycling between heating and cooling modes.
After change-over the control points automatically shift so that
the heating off-point or the cooling off-point equals the set
point temperature.
COOL: The thermostat operates as a cooling-only thermostat.
The heating outputs are disabled.
HEAT: The thermostat operates as a heating-only thermostat.
The cooling outputs are disabled.
If constructed without a mode button, the thermostat operates
in Auto mode, subject to configuration of the 2/4 pipe jumper
and pipe sensor input.
Fan Speed Switch Operation
Fan speed is determined by manual selection from fan switch
OFF to HIGH, MEDIUM and/ or LOW. In units with the
Cycling Fan Option (demand output), the Fan operation
(CYCLING vs. CONTINUOUS) is determined by application
connections. In OFF position all outputs are off and display
blank.
Up/ Down Arrow Operation
A first touch of either arrow will display the set point (a single
set point is employed for both heating and cooling). Continued
pressure on either arrow will scroll the set point to new values.
After three seconds with no pressure on either arrow, the
selected set point becomes effective and the display of the
room temperature resumes.
Setback Operation
Connection of the Setback Input to 24 VAC 1 will force the
control into unoccupied mode (see wiring diagram). Pressing
an arrow key or the mode button on the thermostat cover will
disable the setback input for one hour.
Pipe Sensor Operation
If cold water is detected, the system will operate in summer
mode and the Main output will be cooling. If hot water is
detected, the system will operate in winter mode, the Main
output will be heating and First Stage Secondary Output will
be disabled. In the case of an ambiguous reading, neither hot
nor cold, the thermostat will initiate a purge cycle.
Ratings
Service Menu
Access: Press UP and DOWN arrows for 5 seconds.
Menu Selection: Select 1 to 5 by pressing the mode button or
by pressing the UP and DOWN arrows simultaneously.
Adjust Value: Use UP or DOWN arrow.
Figure 2: Dipswitch Configuration
Table 2: Fan and system switches
Voltage
Rating
Inductive
Resistive
Amps Pilot
Duty Thermostatic
Switching
FLA LRA
24 VAC N.A. N.A. N.A. 24 VA 10 VA
120 VAC 5.8 34.8 6.0 125 VA NA
240 VAC 2.9 17.4 5.0 125 VA NA
277 VAC 2.4 14.4 4.2 125 VA NA
Item # Function Range Default
1 Zone Temp Offset -5.1 F to 5.1 F 0F
2 Valve Stroke Time 30 sec. To 5 min. 120 sec.
3 Fan Delay to OFF 0 to 10 Minutes 0 Sec.
4
Compressor
Minimum Off Time
30 Sec. To 10 min. 120 Sec.
5 Purge Cycle
0 = Time Based
1 = Temperature Based
1
1
2
3
4
5
6
S E C ONDAR Y 1 OFF WITH DE MAND
MAIN 1 OFF WITH DE MAND
C E NTIG R ADE DIS P LAY
N/A
N/A
85 F/ 60 F S E TBAC K
S E C ONDAR Y 1 ON WITH DE MAND
MAIN 1 ON WITH DE MAND
FAHR E NHE IT DIS P LAY
OP E R ATING P OS ITION
90 F/ 50 F S E TBAC K
ON
OP E R ATING P OS ITION
Example: This Dip Switch Is Configured For On With Demand, °F
Display, On-Off Operation And 90/50 F Setback.
NOTE: Thermostat power must be cycled for changes in dip switch
configuration to take effect.