I've been integrating a Building Management system and reached a sticking point with the HVAC.
It's a Lennox aircoolair External DX unit comprising two compressors (Copeland) and two fans. There are two sets of coils in the air handling unit.
The coils in the air handling unit aren't piped in hence not gassed up yet
The BMS Panel has the following termination pairs (other than 3 phase power) for>
Ext DX1 Enable Stage 1
Ext DX1 Enable Stage 2
Ext DX1 Fault
Ext DX2 Enable Stage 1
Ext DX2 Enable Stage 2
Ext DX2 Fault
on Lennox KNCK 48D VFC
signifying:
KN=Prduct = Aircoolair
C= Cooling only (not heat pump)
K = Refrigerant - R407C
48=Cooling Capacity kW
D= 2 [refrigerant] Circuits.
VFC = Volt Free Contact version
The manual I rxed was in Spanish. The Tech Support in Nederlands said refer to the manual. The nearest I could find to an electronic copy [which doesn't refer only to the model we have] is:
http://webmanuals.lennoxeurope.com/...nual (IOM)/MI%20AIRCOOLAIR%20ext%20ingles.pdf
from page 21, would I be correct in assuming the faults for DX1 would come from 62 with and for DX2 63.
We have the rest of the Building Controls up and running on the BMS despite much of the kit received not being that which was specified (to save a few pounds they went for cheaper options and closeouts, which aren't fully BMS compliant).
I don't know much about HVAC so can't make out from the manual the architecture of the DX unit. I'm not even sure the unit has two DXs and if they can be enabled in two stages. That would need oto be a multi-split?
Would stage 1 be the compressor, stage 2 the fan on each half?
Would stage 1 be half speed on a compressor an stage 2 full speed?
I have a suspicion the wrong DX unit has been ordered and it should be a multi-split vfc.
It's a Lennox aircoolair External DX unit comprising two compressors (Copeland) and two fans. There are two sets of coils in the air handling unit.
The coils in the air handling unit aren't piped in hence not gassed up yet
The BMS Panel has the following termination pairs (other than 3 phase power) for>
Ext DX1 Enable Stage 1
Ext DX1 Enable Stage 2
Ext DX1 Fault
Ext DX2 Enable Stage 1
Ext DX2 Enable Stage 2
Ext DX2 Fault
on Lennox KNCK 48D VFC
signifying:
KN=Prduct = Aircoolair
C= Cooling only (not heat pump)
K = Refrigerant - R407C
48=Cooling Capacity kW
D= 2 [refrigerant] Circuits.
VFC = Volt Free Contact version
The manual I rxed was in Spanish. The Tech Support in Nederlands said refer to the manual. The nearest I could find to an electronic copy [which doesn't refer only to the model we have] is:
http://webmanuals.lennoxeurope.com/...nual (IOM)/MI%20AIRCOOLAIR%20ext%20ingles.pdf
from page 21, would I be correct in assuming the faults for DX1 would come from 62 with and for DX2 63.
We have the rest of the Building Controls up and running on the BMS despite much of the kit received not being that which was specified (to save a few pounds they went for cheaper options and closeouts, which aren't fully BMS compliant).
I don't know much about HVAC so can't make out from the manual the architecture of the DX unit. I'm not even sure the unit has two DXs and if they can be enabled in two stages. That would need oto be a multi-split?
Would stage 1 be the compressor, stage 2 the fan on each half?
Would stage 1 be half speed on a compressor an stage 2 full speed?
I have a suspicion the wrong DX unit has been ordered and it should be a multi-split vfc.
