Rapid 2005, Installation, Operation & Service Manual

Page: 147 / 162

SECTION 22: T
ROUBLESHOOTING
137 of 147
22.1 Initial Checks
When enco u ntering any abnormal operation or fa u lt conditions of the eq u ipment, all tro u bleshooting sho u ld
start w ith the follo w ing initial checks. If a problem is disco v ered in these initial checks it m u st be corrected
before mo v ing on in the tro u ble shooting.
1. Compare v oltage and phase of s u pply po w er on site w ith rating plate information.
2. Re v ie w w iring bet w een remote panel and control panel. Do the electrical connections match the s u p-
plied w iring diagram?
3. Compare gas type and s u pply press u re on site w ith rating plate information.
4. Check for proper blo w er rotation on air handler and any exha u st blo w ers.
• Blo w ers po w ered w ith a three phase motor can be re v ersed by s w apping any t w o incoming po w er
legs. For blo w ers po w ered by a single phase motor refer to the motor rating plate for re v ersing
instr u ctions.
22.2 Motor and Blower
PROBLEM POSSIBLE CAUSE SOLUTION
Motor does not operate Main disconnect s w itch is OFF T u rn disconnect to ON
Blo w n f u se(s) in disconnect Replace f u se(s)
Blo w n f u se(s)/breaker tripped in control transformer Replace f u se(s)/reset breaker ( w ith
disconnect off)
Fan s w itch on, Po w er on terminals 3 / 3A Check w iring bet w een remote panel
and air handler. Replace s w itch.
Cool do w n timer TD4 (if eq u ipped) does not reset.
Po w er on 3A?
Replace TD4 timer
Optional: Damper does not open Check that damper is not obstr u cted
Check that linkage is tight and
sec
u re
Verify that 120 V at terminal 3B
Replace damper act
u ator
Time delay relay defect. Po w er on terminal 3D after
set time delay?
Replace time delay relay TR1
Motor starter (contactor) does not operate. Po w er
on terminal 3D and 2?
Replace starter
Tripped motor o v erload. Po w er o u t to MUA motor
w hen motor starter is energized?
Reset
Check for proper FLA setting
Replace o
v erload
If applicable: Tighten scre w s on
heater packs or o v erload.
Optional: Lo w limit s w itch set to high Re-adj u st lo w limit s w itch setting
Blo w er does not operate Belts broken or loose? Replace/tighten belts
Loose motor or blo w er shea v es (p u lleys) Reinstall and properly torq u e set-
scre w s
Blo w er bearings, do they t u rn freely? Replace bearing(s)