IOMM AGR-1
AGR 070A through 100A
47
Figure 28, Outside Air Reset
LWRB
LWSP
OALL
OAHL
OARB
(OALL=OAHL - OARB)
As the OAT increases above the Outdoor Air Low Limit (OALL), the Actual Leaving Water Setpoint
is decreased from its Leaving High Limit (Leaving Water Setpoint plus Leaving Reset Band) to the
Leaving Water Setpoint. When OAT reaches the OAHL, the Actual Leaving Water Setpoint equals
the Leaving Water Setpoint (AI4). If the OAT sensor is missing or unreliable, no reset occurs and the
Actual Leaving Water Setpoint equals the Leaving Water Setpoint. If the Leaving Water Sensor (AI1)
becomes unreliable, the compressor command is forced to 0%.
Return Water Reset (optional Return Water Sensor is required)
When selected, a Return Water Temperature (RWT) sensor is connected to TB-7 terminals #134 and
#135. Four variables are used to setup the reset ramp that calculates the Actual Leaving Water
Setpoint. These are: Leaving Water Setpoint (AI-4), Reset Band selected with a Zone Terminal,
Return Water High Limit (RWHL), and Return Water Reset Band (RWRB).
Figure 29, Return Water Reset
LWRB
LWSP
RWLL
RWHL
RWRB
(RWLL=RWHL - RWRB)
As the RWT increases above the Return Water Low Limit (RWLL), the controller decreases the
Actual Leaving Water Setpoint from its Leaving High Limit (Leaving Water Setpoint plus Leaving
Reset Band) to the Leaving Water Setpoint. When RWT reaches the RWHL, the Actual Leaving
Water Setpoint equals the Leaving Water Setpoint (AI-4). If the RWT sensor is missing or unreliable,
no reset occurs and the Actual Leaving Water Setpoint equals the Leaving Water Setpoint. If the
Leaving Water Sensor (AI-1) becomes unreliable, the compressor command is forced to 0%.
Summary of Contents for AGR 070AS
Page 20: ...20 AGR 070A through 100A IOMM AGR 1 Figure 9 Typical Field Wiring with Global UNT Controller...
Page 22: ...22 AGR 070A through 100A IOMM AGR 1 Figure 11 Standard Single Point Connection with FanTrol...
Page 24: ...24 AGR 070A through 100A IOMM AGR 1 Figure 13 Unit Control Schematic 2 compressor UNT...
Page 25: ...IOMM AGR 1 AGR 070A through 100A 25 Figure 14 Staging Schematic 2 compressor 4 stage UNT...
Page 26: ...26 AGR 070A through 100A IOMM AGR 1 Figure 15 Staging Schematic 2 compressor 6 stage UNT...
Page 27: ...IOMM AGR 1 AGR 070A through 100A 27 Figure 16 MicroTech Controller Schematic...
Page 28: ...28 AGR 070A through 100A IOMM AGR 1 Figure 17 Unit Control Schematic MicroTech...
Page 29: ...IOMM AGR 1 AGR 070A through 100A 29 Figure 18 Staging Schematic 4 stage MicroTech...
Page 30: ...30 AGR 070A through 100A IOMM AGR 1 Figure 19 Staging Schematic 6 stage MicroTech...
Page 31: ...IOMM AGR 1 AGR 070A through 100A 31 Figure 20 Unit Control Schematic 2 compressor MicroTech...
Page 32: ...32 AGR 070A through 100A IOMM AGR 1 Figure 21 UNT Instrument Layout See legend on page 34...
Page 35: ...IOMM AGR 1 AGR 070A through 100A 35 Figure 25 MicroTech Sensor Layout...
Page 99: ...IOMM AGR 1 AGR 070A through 100A 99 Notes...
Page 100: ...Post Office Box 2510 Staunton Virginia 24402 USA 800 432 1342 www mcquay com...
