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MS4PMUHVT Multi-Stage Electronic Temperature Control with Relay Pack Product/Technical Bulletin

Temperature Reset

The control module uses

non-compensated band

and

heating reset

cooling reset

to automatically

adjust the setpoint. These functions appear only when
the Auxiliary Temperature Sensor (ATS) is connected.
If the ATS is connected after the control module is
powered up, the control module must be powered
down and then powered up for these functions to
appear.

Non-Compensated Band

Non-Compensated Band (NCB) is a temperature
differential from setpoint. Within the range of this
differential, variations in the ATS temperature do not
cause a temperature reset. See

Heating Reset

and

Cooling Reset

for more information.

Note:

When Deadband mode or Independent

Setpoint mode are used, NCB is the same for heating
stages and cooling stages.

Heating Reset

When

(Setpoint

– ATS Temperature) > NCB

, the

control adjusts the heating setpoint by the following
amount:

[ATS Temp.

– (Setpoint – NCB)] / Heating Reset

Heating reset only affects the setpoint for heating
stages.

Heating
Reset
Example

Setpoint = 70°F
ATS Temperature = 42°F
NCB = 20F°
Heating Reset = 2F°

Step 1

[ATS Temperature

– (setpoint–NCB)] / heating

reset = [42

– (70 – 20)]/2 = -4

Step 2

se reset
70 + (-4) = 66

Setpoint is reset to 66°F to save energy. See
Figure 19.

42°

Process

Temperature

Sensor

50°

70°

Setpoint

Non-

Compensated

Band

NCB = 20°

1°

Heating

Reset

70°

66°

Auxiliary Temperature Sensor (ATS)

Figure 19: Heating Reset

Cooling Reset

When

(ATS Temperature - Setpoint) > NCB

, the

control adjusts the cooling setpoint by the following
amount:

[ATS

– (Se NCB)] / Cooling Reset

Cooling reset only affects the setpoint for cooling
stages.

Cooling
Reset
Example

Setpoint = 70°F
ATS Temperature= 92°F
NCB = 10F°
Cooling Reset = 2F°

Step 1

ATS Temperature

– (se NCB) / cooling

reset = [92

– (70 + 10)] / 2 = 6

Step 2

se reset
70 + 6 = 76

Setpoint is reset to 76°F to save energy. See
Figure 20.

Setpoint

Non-

Compensated

Band

NCB = 10°

80°

92°

70°

76°

70°

Process

Temperature

Sensor

1°

Cooling

Reset

Auxiliary Temperature Sensor (ATS)

Figure 20: Cooling Reset

Содержание MS4PMUHVT

Страница 1: ... two cooling stages with common setpoint two independent sets of two dependent stages two heating stages and two cooling stages with independent setpoints Figure 1 MS4PMUHVT Multi Stage Electronic Temperature Control with Relay Pack Features and Benefits Single Package Provides the functionality of multiple control components at a cost effective price Easily Readable Display Displays main sensor o...

Страница 2: ...y applications cooling tower pump and or fan control rooftop heating or cooling units boiler or pump control space temperature control compressor or chiller staging The MS4PMUHVT control has four heavy duty relays See electrical ratings in Table 6 for more information Operation Mode Selection Mode Selection allows selection of one of several modes Direct mode for cooling applications Reverse mode ...

Страница 3: ...out control functions and how to program them see Programming the Control and Control Functions Control Module Front Panel The control module has an LED display and buttons for entering programming information and activating various features The display has three LED digits and a minus indicator It displays a temperature range from 40 to 176 F 40 to 80 C in increments of 1F or C The display also f...

Страница 4: ...r and slide the mounting clip back to remove the mounting clip from the back of the control module 3 Pull the control module out of the mounting bracket on the relay pack 4 Disconnect the wiring from the control module and the relay pack terminals V1 V2 O1 and O2 See Figures 7 9 Mounting the Relay Pack Before mounting the relay pack ensure that there is sufficient space Follow these steps to mount...

Страница 5: ... or 165 m if C is used See Table 1 and Temperature Management Functions Temperature Sensor Offset Table 1 Sensor Wire Size and Length Wire Size and Length Offset 18 AWG 20 AWG 22 AWG 300 599 ft 190 374 ft 120 239 ft 1 F 600 899 ft 375 564 ft 240 349 ft 2 F 900 ft 565 ft 350 ft 3 F 165 329 m 105 204 m 65 129 m 1 C 330 495 m 205 310 m 130 195 m 2 C Wiring the Relay Pack WARNING Risk of Electric Shoc...

Страница 6: ...lay 2 Control Relay 3 Control Relay 4 Internal to Relay Pack Load 1 Load 2 Load 3 Load 4 Figure 11 Typical 240 VAC Relay Pack Wiring Connections Note All circuits must have a common disconnect and be connected to the same pole of the disconnect 240 120 NO1 CM1 NC1 NO2 CM2 NC2 NO3 CM3 NC3 NO4 CM4 NC4 Control Relay 1 Control Relay 2 Control Relay 3 Control Relay 4 Internal to Relay Pack Load 1 Load ...

Страница 7: ...ending the On cycle of Stage 1 Differential is the operational range of Stage 1 Setpoint 2 is the offset from Setpoint that activates Stage 2 Differential 2 is the operational range of Stage 2 Setpoint 3 is the offset from Setpoint that activates Stage 3 Differential 3 is the operational range of Stage 3 Setpoint 4 is the offset from Setpoint that activates Stage 4 Interstage Time Delay is the min...

Страница 8: ...is the operational range of Stage 1 Differential 2 is the operational range of Stage 2 Setpoint 3 is the offset from the low end of the deadband that activates Stage 3 Differential 3 is the operational range of Stage 3 Setpoint 4 is the offset from the high end of the deadband that activates Stage 4 Differential 4 is the operational range of Stage 4 Interstage Time Delay is the minimum amount of t...

Страница 9: ...ferential is the operational range of Stage 1 Setpoint 2 the desired cooling temperature programmed by the user It is the basis for the direct stages In Direct mode cooling applications when Setpoint is reached on a temperature drop the N O relay contacts open ending the On cycle Differential 2 is the operational range of Stage 2 Setpoint 3 is the offset from Setpoint that activates Stage 3 Differ...

Страница 10: ...ting Note If Enter is not pressed the new mode of operation is not saved and the control reverts to the previous mode of operation Changing the Setpoint in Direct Reverse and Deadband Modes 1 Press and hold Enter for approximately three seconds 2 Release Enter when the new Setpoint value displays 3 Press Up or Down to display the new Setpoint value 4 Press Enter to save the new setting Note If Ent...

Страница 11: ... Delay is the minimum amount of time between two successive stages when multiple stages are called for in rapid sequence rt Soft Start controls the rate at which the controlled temperature is allowed to approach Setpoint on power up both initially and when the binary input is configured as remote shutoff The setting is minutes temperature units such as minutes F See Figure 18 Output Status up to f...

Страница 12: ...nd displaying an alarm message on the display This function reduces alarm oscillation and nuisance alarms caused by temperatures that temporarily exceed alarm setpoint temperatures Binary Input Functions iF Binary Input Mode allows selection of how the Normally Closed N C binary input activates the stage control contacts Binary Input Mode can be disabled or can provide one of three predetermined r...

Страница 13: ... the heating setpoint by the following amount ATS Temp Setpoint NCB Heating Reset Heating reset only affects the setpoint for heating stages Heating Reset Example Setpoint 70 F ATS Temperature 42 F NCB 20F Heating Reset 2F Step 1 ATS Temperature setpoint NCB heating reset 42 70 20 2 4 Step 2 setpoint reset 70 4 66 Setpoint is reset to 66 F to save energy See Figure 19 42 Process Temperature Sensor...

Страница 14: ...oint Stop 32 F HL High Setpoint Stop Low Setpoint Stop to 99 F 80 C 90 F Cc Cycle Delay Cooling 0 to 9 minutes 2 minutes CH Cycle Delay Heating 0 to 9 minutes 0 minutes rt Soft Start 0 to 99 minutes degrees 10 AH High Temperature Alarm 0 to 50F 0 to 50C 15 F AL Low Temperature Alarm 50 to 0F 50 to 0C 15 F Ad Alarm Differential 1 to 9F 1 to 9C 5 F At Alarm Time Delay 0 to 99 minutes 15 minutes So T...

Страница 15: ...w Temperature Alarm value Alarm message displays Correct the condition to reset EE Program failure Alarm message displays other outputs off Replace control Table 4 Status Codes Steady Status Code Indicates On Auxiliary temperature sensor S2 is not connected or if it is connected the sensor or binary input is open or shorted OF Binary input is closed Ordering Information Table 5 Ordering Informatio...

Страница 16: ... 11C 14 to 140 F 10 to 60 C 0 to 95 RH noncondensing RP4MSUHV 1C 40 to 140 F 10 to 60 C 0 to 95 RH noncondensing Ambient Storage Conditions MS4PMUHVT 11C 22 to 176 F 30 to 80 C 0 to 95 RH noncondensing MS4PM12C 11C 22 to 176 F 30 to 80 C 0 to 95 RH noncondensing RP4MSUHV 1C 40 to 185 F 40 to 85 C 0 to 95 RH noncondensing Dimensions H x W x D See Figures 3 5 Agency Listings UL Listed US File SA516 ...

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