FIELD CONTROLS TM-90R Humidity Control Installation Guide

: July 5, 2024
: FIELD CONTROLS

Table of Contents

FIELD CONTROLS TM-90R Humidity Control
FAQ
Installation Instructions
ITEMS INCLUDED IN THIS KIT
Contacts
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

FIELD CONTROLS TM-90R Humidity Control

FAQ

Q: Do I need to adjust the humidity setting?
- A: The humidity level indications on the Humidistat Cover are for reference only. You may need to adjust the knob to a higher or lower setting based on the actual humidity level in your home.

Installation Instructions

CAUTION: DISCONNECT THE TM-90R/TM-2000 TRANSFORMER FROM THE RECEPTACLE AND SWITCH “OFF” THE FURNACE ELECTRICAL SUPPLY PRIOR TO INSTALLING THIS HUMIDISTAT.

Remove Humidity Control from front side of Base Plate and reattach to back side of Base Plate. The Adjustment Knob must protrude through the hole in the Base Plate. (Figs. 1 & 2)
Attach Shaft Extension to Humidity Control Adjustment Knob. (Fig. 3)
Place Mounting Template on a smooth, vertical surface of the furnace return air plenum. This location should be close enough to the TM-90R/TM-2000 housing that the 10′ length of 2-conductor thermostat wire can be connected to each device and secured along the length. Follow all Template Instructions. (Fig. 4)
Cut away the plastic material which partially covers the wiring slot on the base plate. (Fig. 5)
Refer to the Wiring Diagram and attach the wires to the Humidity Control terminals #2 and #3, both Transformer terminals and both TM-90R/TM-2000 terminals, as indicated. The Wiring Diagram shows the proper wire termination required for each connection.
- CAUTION: All wiring should conform to The National Electrical Code, NEC, and any applicable local codes.
Attach the Foam Mounting Gasket to the Return Air Plenum around the opening which was previously cut. Secure the Base Plate to the furnace plenum using the two screws supplied. Be sure that the wires are placed through the wiring slot. Do not pull the wires tight. (Figs. 6 & 7)
Attach the Cover to the Base Plate, then attach the into the receptacle.
- Adjustment Knob to the Knob Extension. (Fig. 8)
Set the Adjustment Knob to the desired humidity level.
Switch “ON” the electrical supply to the furnace and plug the TM-90R/TM-2000 Transformer.

NOTE: The Humidistat will allow the electrical current supplied by the Transformer to flow to the TM-90R/TM-2000 when there the return air plenum humidity drops below the Humidity setting. The TM-90R/TM-2000 “ON/OFF’ action is still controlled by the thermal switch which senses warm air flow. The TM- 90R/TM-2000 will operate only when the furnace is operating AND the Humidistat senses a need for humidity. This will prevent the TM- 90R/TM-2000 from operating if there is sufficient humidity in the air and also allow greater humidity control during weather variation.

NOTE: The Humidity level indications on the Humidistat Cover are for reference only. It may be necessary to adjust the Knob to a higher or lower setting based upon the actual humidity level within the home.