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Table 10 – Economizer Module - Right Hand Terminal
Blocks
Label
Type
Top Right Terminal Block
N/A
The first terminal is not used
24
Shut Down (SD) or Heat (W)
AUX2 I
Conventional only
VAC IN
and
Heat Pump Changeover (O?B) in
Heat Pump mode
OCC
24
Occupied / Unoccupied Input
VAC IN
E- GND
E- GND
Earth Ground - System Required
EXH1
24
Exhaust Fan 1 Output
VAC OUT
AUX1 O
24
Programmable:
VAC OUT
Exhaust fan 2 output
or
ERV
or
System alarm output
Bottom Right Terminal Block
Y 2- 1
24
Y2 in - Cooling Stage 2 Input from
VAC IN
space thermostat
Y 2- O
24
Y2 out - Cooling Stage 2 Output to
VAC OUT
stage 2 mechanical cooling
Y 1- I
24 VAC IN
Y1 in - Cooling Stage 2 Input from
space thermostat
Y 1- O
24
Y1 out - Cooling Stage 2 Output to
VAC OUT
stage 2 mechanical cooling
C
COM
24 VAC Common
R
24 VAC
24 VAC Power (Hot)
Table 11 – California Title 24 Regional High Limit Dry Bulb Temperature Settings
(Table 140.4- B Air Economizer High Limit Shut Off Control Requirements)
Device Type
Fixed Dry Bulb
Differential Dry Bulb
a
Only the high limit control devices listed are allowed to be used and at the setpoints listed. Others such as Dew Point, Fixed Enthalpy, Electronic Enthalpy,
and Differential Enthalpy Controls, may not be used in any climate zone for compliance with Section 140.4(e)1 unless approval for use is provided by the
Energy Commission Executive Director.
b
At altitudes substantially different than sea level, the Fixed Enthalpy limit value shall be set to the enthalpy value at 75° F and 50% relative humidity. As an
example, at approximately 6,000 foot elevation, the fixed enthalpy limit is approximately 30.7 Btu/lb.
Description
Climate Zones
1, 3, 5, 11- 16
Outdoor air temperature exceeds 75° F
2, 4, 10
Outside air temperature exceeds 73° F
6, 8, 9
Outside air temperature exceeds 71° F
7
Outside air temperature exceeds 69° F
1, 3, 5, 11- 16
Outdoor air temperature exceeds return air temperature
2, 4, 10
Outdoor air temperature exceeds return air temperature minus 2° F
6, 8, 9
Outdoor air temperature exceeds return air temperature minus 4° F
7
Outdoor air temperature exceeds return air temperature minus 6° F
Time- out and Screen Saver
When no buttons have been pressed for ten minutes, the
LCD displays a screen saver, which cycles through the
status items. Each status item displays in turn and cycles
to the next item after five seconds.
HH79ZZ007 Dry Bulb Sensor
Economizers are shipped standard with an HH79ZZ007
outside air dry bulb sensor, which looks like an eyelet
terminal with two green wires. This sensor is factory
installed on the front of the economizer in the outside air
stream. System default setting (high temp limit) is 63
°
and has a range of 48
F to 80
NOTE: A 2nd HH79ZZ007 sensor is provided for mixed
(supply) air temperature.
NOTE: California high temperature setting requirements
by region are shown below.
20k Sensor
Fig. 34 - HH79ZZ007 Sensor
Required High Limit (Economizer Off When):
Descriptions
25
°
F,
°
F.
1/4 Terminal (2)
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