Carrier CRECOMZR103A00 - Enthalpy Settings (Enthalpy Option); Limit Settings

12
Economizers are shipped standard with an HH79NZ039 outside
air dry bulb sensor (see Fig.
25). System default setting (high temp
limit) is 63°F (17°C), and has a range of 48°F to 80°F (9°C to
27°C). Sensor is factory installed on economizer.
NOTE: A second HH79NZ039 sensor is provided for mixed air
temperature.
NOTE: California high temperature setting requirements by
region are shown in Table
7.
ENTHALPY SETTINGS (ENTHALPY OPTION)
If installing the optional HH57LW001 enthalpy sensor, then the
HH79NZ039 dry bulb outside air sensor must first be removed.
Wire sensor to harness 48TC005213 and the (5) wires from the
harness to the EconomizerONE harness in the return air chamber.
Harness 48TC005213 has a 5 pin plug that connects directly to the
HH57LW001 enthalpy sensor. See Fig.
19 for wiring connections.
Refer to Fig. 26 and Table 8.
California’s Title 24 High Temperature
Limit Settings
California’s Title 24 code requires a high temperature limit setting
for all dry bulb outside air economizer changeover. The tempera
-
tures vary by the region within California. See Table 7 for high
limit settings.
Table 6 — Enthalpy Manual Entry Setpoints for EconomizerONE Per Climate Zone
CLIMATE ZONES
a
2 TEMP OFF
Lowest
Setting
RH% 2 ENTH OFF RH% 2THL 2EHL RH%
1 65°F 22 Btu/lbm 43% 28 Btu/lbm 86% 83°F 33 Btu/lbm 48%
2 65°F 22 Btu/lbm 43% 28 Btu/lbm 86% 83°F 33 Btu/lbm 48%
3 65°F 22 Btu/lbm 43% 28 Btu/lbm 86% 83°F 33 Btu/lbm 48%
4 65°F 22 Btu/lbm 43% 28 Btu/lbm 86% 83°F 33 Btu/lbm 48%
5 70°F 22 Btu/lbm 28% 28 Btu/lbm 65% 83°F 33 Btu/lbm 48%
6 70°F 22 Btu/lbm 28% 28 Btu/lbm 65% 83°F 33 Btu/lbm 48%
7 & 8 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
CALIFORNIA
TITLE 24 ZONES
b
2 TEMP OFF
Lowest
Setting
RH% 2 ENTH OFF RH% 2THL 2EHL RH%
1 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
2 73°F 22 Btu/lbm 22% 28 Btu/lbm 55% 83°F 33 Btu/lbm 48%
3 75°F 22 Btu/lbm 19% 28 Btu/lbm 55% 83°F 33 Btu/lbm 48%
4 73°F 22 Btu/lbm 22% 28 Btu/lbm 55% 83°F 33 Btu/lbm 48%
5 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
6 71°F 22 Btu/lbm 28% 28 Btu/lbm 62% 83°F 33 Btu/lbm 48%
7 69°F 22 Btu/lbm 32% 28 Btu/lbm 68% 83°F 33 Btu/lbm 48%
8 71°F 22 Btu/lbm 28% 28 Btu/lbm 62% 83°F 33 Btu/lbm 48%
9 71°F 22 Btu/lbm 28% 28 Btu/lbm 62% 83°F 33 Btu/lbm 48%
10 73°F 22 Btu/lbm 22% 28 Btu/lbm 55% 83°F 33 Btu/lbm 48%
11 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
12 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
13 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
14 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
15 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
16 75°F 22 Btu/lbm 19% 28 Btu/lbm 50% 83°F 33 Btu/lbm 48%
Controller Default
Settings
2 TEMP OFF — — 2 ENTH OFF — 2THL 2EHL RH%
Default Set Points 63°F — — 28 Btu/lbm 94% 83°F 33 Btu/lbm 48%
NOTE(S):
a. See Fig. 19 for map of U.S. and Canada climate zones.
b. See Fig. 20 for map of California Title 24 zones
Table 7 — California Title 24 Regional High Limit Dry
Bulb Temperature Settings
a
DEVICE TYPE
b
CLIMATE
ZONES
REQUIRED HIGH LIMIT
(ECONOMIZER OFF WHEN):
DESCRIPTION
FIXED DRY
BULB
1, 3, 5, 11-16 OAT exceeds 75°F
2, 4, 10 OAT exceeds 73°F
6, 8, 9 OAT exceeds 71°F
7 OAT exceeds 69°F
DIFFERENTIAL
DRY BULB
1, 3, 5, 11-16
OAT exceeds
RA temperature
2, 4, 10
OAT exceeds return air temperature
–2°F
6, 8, 9
OAT exceeds return air temperature
–4°F
7
OAT exceeds return air temperature
–6°F
FIXED
ENTHALPY
c
+ FIXED DRY
BULB
All
OAT exceeds 28 Btu/lb of dry air
b
or
OAT exceeds 75°F
NOTE(S):
a. This table sourced from 2019 California Energy Code, Title 24, Part 6, Table
140.4-E Air Economizer High Limit Shut Off Control Requirements.
b. Only the high limit control devices listed are allowed to be used and at the set
points 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.
c. 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 ex-
ample, at approximately 6,000 foot elevation, the fixed enthalpy limit is approx-
imately 30.7 Btu/lb
LEGEND
OAT — Outdoor-air Thermostat
RA — Return Air