MTD 248-604A Manual de instalación descargar pdf (Pagina 25)

IM 1083 Self-Contained WSHP Unit Ventilator Models ARQ, ERQ, GRQ Page 25 of 42

15. Outdoor Air Temperature Sensor (S3): The sensor is located in the

outdoor air section of the unit before the outdoor air damper. With

network applications, the unit mounted sensor can be overridden

by a remote sensor through the network.

16. Outdoor Air Humidity Sensor (S8) (optional): Unit mounted

humidity sensor for units using Expanded outdoor enthalpy

economizer or Leading Edge indoor/outdoor, true enthalpy

comparison economizer. The sensor is located in the outdoor air

section of the unit before the outdoor air damper. With network

applications, the unit mounted sensor can be overridden by a

remote sensor through the network.

17. Room Humidity Sensor (S6) (optional): Unit mounted humidity

sensor for units capable of active dehumidication or with units

using Leading Edge indoor/outdoor, true enthalpy comparison

economizer. The sensor is located in the sampling chamber (front,

center panel) where room air is continuously drawn through for

fast response to humidity changes in the room. With network

applications, the unit mounted sensor can be overridden by a

remote sensor through the network.

18. CO2 Sensor (S7) (optional): Unit mounted, single beam absorption

infrared gas sensor with a sensing range of 0 – 2000 ppm and

voltage output of 0 to 10 VDC (100 ohm output impedance). The

Pitot Tube sensing device is located in the unit ventilator’s return

air stream. The optional CO2 sensor is used with the UVC’s

Demand Control Ventilation feature to vary the amount of outside

air based on actual room occupancy. With network applications,

the unit mounted sensor can be overridden by a remote sensor

through the network.

19. Water Out Temperature Sensor (S9): The water out temperature

sensor is factory wired. The sensor must be eld-installed and

insulated (by others) and located on the return connection of the

plate heat exchanger.

20. Water Coil DX Temperature Sensor (S5): The S5 sensor is

factory wired, installed and insulated. It is located on the lower

left refrigerant line of the plate heat exchanger leading to the

expansion valve.

Not all external signal options can be used simultaneously and

may not be available on all software models. Refer to the “UVC

Input and Output Tables” in IM 739 for available options.

NOTICE

Figure 45: Top View - Local User Interface Compartment

9. Fuse(s): Fan motor and controls have the hot line(s) protected by

factory installed cartridge type fuse(s).

10. Control Transformer: 75 VA 24-volt NEC Class 2 transformer

for 24 volt power supply. (Located behind the motor transformer).

11. Outdoor Air/Return Air Damper Actuator (A1): Direct coupled,

oating point (tristate) actuator that spring returns the outdoor air

damper to the closed position upon a loss of power.

12. Low Refrigerant Temperature Sensor (S4): The S4 sensor is

provided on all units with a direct expansion (DX) cooling coil.

It is located on the right hand side of the air coil “u-bend”.

13. Room Temperature Sensor (S1): The unit mounted sensor is

located in the sampling chamber (front, center section) where

room air is continuously drawn through for prompt response

to temperature changes in the room. A Remote Wall Mounted

Temperature Sensor is also available for remote room temperature

sensing. (optional accessory).

14. Discharge Air Temperature Sensor (S2): The sensor is located on

the second fan from the right to sense discharge air temperatures.

Figure 44: MicroTech II Control Boards (with LonWorks

Module Installed)

Plug-in Control Module

Terminal Connections

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 41 42

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MTD 248-604A Manual de instalación Pagina 25

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