- *LCU RTEM Minimum Damper position Set up on Multi-speed and Single Zone VAV Evaporator Fan Units for Precedent and Voyager II
There are 3 speeds and damper positions to set up, LOW, MEDIUM, and HIGH.
Damper minimum position adjustments should be done in the test mode.
- Test step 1 (supply fan) forces the supply fan to run at LOW speed. The minimum position of the economizer damper is allowed to travel between 0% and 100% when the fan is at LOW speed. This is adjusted by the DCV Min potentiometer on the RTEM.
- Test step 3 (Compressor stage 1) forces the supply fan to run at MEDIUM speed. The minimum position of the economizer damper is allowed to travel between 0% and 75% when the fan is at Medium speed. This is adjusted by the LL potentiometer on the RTEM.
- Test step 4 (Compressor stage 2) forces the supply fan to run at HIGH speed. The minimum position of the economizer damper is allowed to travel between 0% and 50% when the fan is at HIGH speed. This is adjusted by the DESIGN Min potentiometer on the RTEM.
-
Voyager and Precedent Minimum Damper position Set up on Multi-speed and Single Zone VAV Evaporator Fan Units -
Notes:
BAS setpoints and control overrides any local potentiometer adjustments.
An economizer on a Light Commercial multi speed supply fan or the single zone VAV option must have the fully populated "enhanced" RTEM of at least version 2.0 or greater.
The Powered Exhaust set point should be set in the HIGH fan speed (Test step 4, Compressor stage 2).
ReliaTel will determine an adjusted setpoint for other fan speeds based on this setting.
It is not recommend to use a motorized damper with multi speed or Single Zone VAV units.
For MZVAV units, refer to the latest version RT-SVD03N-EN (page 192)
Latest ReliaTel Manual can be down loaded here: ReliaTel Service & Diagnostic Support Manual
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.