Table 57: Smart Equipment™ economizer board - binary inputs
Location
Board label
Cover
label
Description
Function and comments
PURGE
24 VAC hot input from the purge dry contact
Purge parameter reports input status (False with 0 VAC input-True with 24 VAC
input). When Purge status is True, heating and cooling operation is prevented,
the indoor blower and power exhaust fan operate, the economizer actuator is
positioned to 100%.
IN9
24V~
24 VAC hot supplied for the purge dry contact
Connects through circuit trace to 24V~ IN pin HOT
EX VFD FLT
24 VAC hot input from the power Exhaust Variable
Frequency Drive Fault contact
ExFanVFDFlt parameter reports input status (Normal with 0 VAC input-Alarm
with 24 VAC input) when ExFType selection is Variable Frequency Fan. When
ExFanVFDFlt status is Alarm, EX-FAN fan output is prevented.
G
IN10
24V~
24 VAC hot supplied for the power exhaust variable
frequency drive fault contact
Connects through circuit trace to 24V~ IN pin HOT
Indoor air quality
Indoor air quality (IAQ) is regulated by an indoor
sensor input. The IAQ sensor is connected to the
economizer board through the IAQ analog input
terminal and the associated COM and 24V~ inputs
on the economizer board. Terminal IAQ accepts
a 0 VDC to +10 VDC signal with respect to the IAQ
terminal. When the signal is below its setpoint,
the actuator can modulate normally in accordance
with the enthalpy and mixed air sensor inputs.
When the IAQ signal exceeds its setpoint setting
and there is no call for free cooling, the actuator
is proportionately modulated from the 0 VDC to
10 VDC signal, with 0 VDC corresponding to full
closed and 10 VDC corresponding to full open. When
there is no call for free cooling, the damper position
is limited by the IAQ maximum damper position
setting. When the signal exceeds its setpoint
(demand control ventilation setpoint) setting
and there is a call for free cooling, the actuator
modulates from the minimum position to the full
open position based on the highest call from either
the mixed air sensor input or the IAQ voltage input.
•
Optional CO
2
space sensor kit (wall mount) -
part no. 2AQ04700724
•
Optional CO
2
sensor kit (unit mount) - part no.
2AQ04700624
Phasing
All units are properly phased at the factory. Check
for proper compressor rotation. If the blower
or compressors rotate in the wrong direction
at start-up, the electrical connection to the unit
is misphased. Change the phasing of the field
line connection at the factory or field supplied
disconnect to obtain proper rotation. Scroll
compressors operate in only one direction. The
scroll is misphased if it is drawing low amperage,
has similar suction and discharge pressures, or it
produces a high noise level.
CAUTION
Scroll compressors require proper rotation to operate
correctly. Units are properly phased at the factory.
Do not change the internal wiring to make the blower
condenser fans or compressor rotate correctly.
Blower rotation
Check for proper supply air blower rotation. If the
blower is rotating backwards, the line voltage at the
unit point of power connection is misphased. See
Adjusting the belt tension
About this task:
To adjust the belt tension complete the following
steps.
1. Loosen the two top nuts (B) on each L-bolt.
2. Loosen the two lower nuts (C) on each L-bolt.
Installation Manual: YORK
®
Sun™ Select YV28 to YV50
77
Johnson Controls Ducted Systems
Содержание Sun Select YV28
Страница 2: ...Tested in accordance with ...
Страница 104: ...Start up sheet Installation Manual YORK Sun Select YV28 to YV50 104 Johnson Controls Ducted Systems ...
Страница 105: ...Installation Manual YORK Sun Select YV28 to YV50 105 Johnson Controls Ducted Systems ...
Страница 106: ...Installation Manual YORK Sun Select YV28 to YV50 106 Johnson Controls Ducted Systems ...
Страница 107: ...Installation Manual YORK Sun Select YV28 to YV50 107 Johnson Controls Ducted Systems ...
Страница 108: ...Installation Manual YORK Sun Select YV28 to YV50 108 Johnson Controls Ducted Systems ...
Страница 109: ...Installation Manual YORK Sun Select YV28 to YV50 109 Johnson Controls Ducted Systems ...