ChillTechnican
01-06-2009, 09:13 AM
Hi all, i have managed to put together a heatpump for domestic hot water, and have it plumbed up and running ok but have some questions about "tuning it".
It is on R410a , using a rotary compressor .It is a split unit with evaporator in the roof space and compressor and tube in tube heat exchanger under the floor directly beneath hot water cylinder.
When running i have
head pressure 485 psi @ 55 c
liquid out of heat exchanger 45 c
water out 64 c
discharge temp 78 c
evap 120 psi @ 4 c
air on 16 c
air off 11 c
suction temp 11.8 c
the ambient temperatures have dropped a bit in the last week , down to 8 or 9 deg c and the unit will run for 5 mins before any hot water gets to cylinder. Do you think that is a little bit under charged with the super heat??
Also i was wondering about in the summer time when temps get into 40s in the roof space would it be a good idea to have a fan speed controller to slow the fan and drop evap pressure a bit?.(i have one lying around)
thanks for any advice
take care CT
It is on R410a , using a rotary compressor .It is a split unit with evaporator in the roof space and compressor and tube in tube heat exchanger under the floor directly beneath hot water cylinder.
When running i have
head pressure 485 psi @ 55 c
liquid out of heat exchanger 45 c
water out 64 c
discharge temp 78 c
evap 120 psi @ 4 c
air on 16 c
air off 11 c
suction temp 11.8 c
the ambient temperatures have dropped a bit in the last week , down to 8 or 9 deg c and the unit will run for 5 mins before any hot water gets to cylinder. Do you think that is a little bit under charged with the super heat??
Also i was wondering about in the summer time when temps get into 40s in the roof space would it be a good idea to have a fan speed controller to slow the fan and drop evap pressure a bit?.(i have one lying around)
thanks for any advice
take care CT