Issue:
RTHA Starter Dry Run
Resolution:
DANGER !!!
1) REMOVE LINE VOLTAGE!
2) Check Phasing
3) Pull 2F1, 2F2, 2F3 fuses
4) Apply external 115V to 1TB5-11 (hot) and 1TB5-2 (neutral)
5) Turn Control ON to ensure Heaters continue to be energized; 1S1 closed
6) Make 2 sets of jumpers with open toggle switches
7) Bypass 2U1 Phase Reversal Contacts; this is achieved by adding an additional jumper from 2TB2-6 to the 2K5 coil. Or see the chiller wiring diagram to bypass 2U1 contact right at the 2K5 Pilot Relay.
8) Start Switch -- Put one set of jumpers between 1TB2-9 and 1TB2-7 (open switch)
9) Transition Switch -- Put one set of jumpers between 1TB2-5 and 1TB2-6 (open switch)
Close Start Switch (Y-mode of motor operation). Verify 2K5 Pilot Relay, 2K3 Shorting Contactor, and 2K1 Start Contactor all energize.
After 8 seconds Close "transition switch" (Delta-mode of motor operation)
Close the Transition Switch and verify the 2K4 Transition Contractor, 2K2 Run Contractor energize, and the 2K3 Shorting Contactor de-energize. Note: the 2K1 Start Contactor remains energized.
Remove jumpers; return everything back to normal.
Ready to start if heater has been energized 3hrs.
Notes:
Changes:
Other Question/Problem/Cause Statements:
- RTHA Starter Dry Run?
- RTHA Starter Testing?
Facts:
- RTHA
Document Identifier: DOC-74466
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.