How do I know if my unit is multi-stage? - http://www.hvacmechanic.com/ Forums
Original message
| lauramorrissey
 |  "How do I know if my unit is multi-stage?"
, posted Sat 12 Jul 01:47  
I'm sorry for asking such a dumb question....I just had a 4 Ton Goodman 15 SEER Variable Speed R410A Air Conditioner Split System installed. I also installed a White-Rodgers 90 Series Thermostat. All seemed to go well, but unfortunately the unit is constantly cooling. Woke up this morning to a 57 degree temp! I've narrowed this down to a problem with the thermostat since the unit stops when the thermostat is removed from the wall. The thermostat has settings for:
MS 2 = multi-stage, no heat pump
HP 1 = one heat pump, one compressor
HP 2 = two heat pumps, two compressor/2-speed compressor
SS 1 = single stage
I'm thinking the settings for this might be pooched. Thanks in advance for anyone that can help out. I really appreciate it!
L
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Replies:
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| Banger
| "Re(1):How do I know if my unit is multi-stage" , posted Sat 12 Jul 07:26
On the old thermostat - You should have had more than one 'Y' wire or 'W' wire for multi stage systems. Also there would be a 'O' wire if it were a heat pump. Generally for single stage heat/AC systems there are wires attached to R G Y W and maybe C. Any extra wires may be for other stages or heat pump valve.
I looked at Goodman's webiste and I don't see any multi-stage cooling products. Model #'s would tell us what unit you have.
I'd suspect a wiring issue though. Even in the wrong mode, the thermostat should shut the unit off when it reaches set temperature. The thermostat might be miswired.
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| | lauramorrissey
| "Re(2):How do I know if my unit is multi-stage" , posted Sun 13 Jul 18:16:
You are right - it is a wiring issue and our system is not multi-stage. I'm not sure if the wiring issue is with the handler or with the thermostat. I called the technician that did the installation and asked about the thermostat configuration, particularly 'W' because it wasn't routed to anything. We have an electric furnace, so he said 'W' wasn't used. He went into the attic and came down saying the issue was with the air handler and that the air handler had a jumper on there that he was supposed to remove.
Seemed good and the technician left but then the compressor stopped working. It's 76 in the house and climbing - 100 outside (I live in AZ)
I popped off the thermostat and saw that the technician had wired the following:
O = white
Y = yellow
G = green
RC & RH = jumpered together
C = light blue
On the other side is (none of which are connected):
+
S
-
W2
WE
6
L
Now I'm not sure if the problem is with the air handler or the thermostat. Called the technician but he didn't answer the phone. I figure I'll give him until tomorrow and then call someone else.
L
[this message was edited by lauramorrissey on Sun 13 Jul 18:20] |
| | Houston204
| "Re(2):How do I know if my unit is multi-stage" , posted Sat 12 Jul 09:22
I don't even see 15 SEER units listed.
Air Conditioning systems...
16 SEER SSX16
14 SEER SSX14
14 SEER GSC14
13 SEER GSX13
13 SEER GSC13
Heat pumps...
16 SEER SSZ16
14 SEER SSZ14
14 SEER GSH14
13 SEER GSZ13
13 SEER GSH13
"Tip of the Day" Remember to remove power first.
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| | lauramorrissey
| "Re(3):How do I know if my unit is multi-stage" , posted Sun 13 Jul 18:19
Sorry, it's a split system with a combined seer rating of 15.
http://www.acwholesalers.com/ProductDetails.asp?ProductCode=11444
L
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