I'm new to the board and hoping someone can help me. I have two conditioned zones in my house with a Janitrol GMP N0804 REV B in one and a Janitrol GMP 075-3 REV B in the other, both with matching cooling coils and condensers with a total of 5-1/2 tons of cooling capacity. My house is 3200 square feet, well insulated, double paned glazing etc., but the cooling has never worked very well. The supply air is quite cold, but the overall cooling is poor (eg. when its 90 degress out, the cooling has to run for 3 or 4 hours to get the interior temp to drop 8 or 10 degrees). So my questions are as follows:
1. Is the cooling capacity adequate for the house size?
2. Is there a way to increase the airflow to push more cold air? If so, is it something I can get the thermostat to switch so the increased air flow only comes with the cooling demand?
3. Is there anywhere on line I can get Janitrol literature for these two units?
Thanks in advance!
Thanks for the reply. I realize that cooling load calcs would answer the load question, but I was looking for a rule of thumb answer. The house is 4 years old, tight, well insulated (R-19 walls, R-30 ceilings and floors), with about 18% dual glazing distributed about equally on the four orientations in a climate zone with a 1% cooling design temperature of 85 degrees, and relatively dry when cooling is required. Does anyone know if 5 to 6 tons of capacity is about right?
Okay. For the lower zone, a UAdeltaT calc at a 1% design temp yields 4,200 btu/hr. The west glazing gains a max of 12,050 btu/hr per ASHRAE solar heat gain factors. I forget the specific heat and density of air, but even if you add fifty percent of the conductive gains for infiltration, and a like amount for internal gains, you still come up way short of 3 tons, which is what I have cooling the zone. So something does not compute. Am I missing something? Does anyone have a rule of thumb for air conditioning sizing?
- 15 Old House Features We Were Wrong to Abandon
- 17 Tiny Bathrooms We Love
- 20 Insanely Easy 60-Minute Home Improvements
- 70 Gardening Tricks and Ideas for Total Beginners
- 16 Inventive Beds You Can Make Yourself
- Top 10 Classic DIY Projects for the Outdoors
- 15 Once-Popular Household Items That Are Vanishing
- 159 Smart Storage Ideas for the Whole House
- 30 Things Every Adult Should Know How to Do
- 10 Wise Ways to Get Rid of Pests and Critters
- 9 Totally Amazing Mobile Home Makeovers
- Top Tips for Keeping Countertops Like New
- 15 Amazing Things You Can Make with $0 Scrap Wood
- 14 Ways to Get More Kitchen Counter Space
- Assembly Required: 15 DIY Kit Homes
- 18 Bathroom Updates You Can Do in 1 Day
- 9 Tried-and-True Methods of Eliminating Weeds
- Top 11 Color Trends to Follow in 2014
- 11 Clever Alternatives to Kitchen Cabinets
- 7 Easy Budget-Friendly Backyard Makeovers
- 10 Laundry Room Ideas to Knock Your Socks Off
- 10 “Stone Sober” Household Uses for Liquor
- 10 Fun Planters to Make with Everyday Objects
- 15 Spring Home Maintenance Musts
- 20 Ways to Make a Small Bathroom Big
- Man, Oh Man! 7 Unbelievable Guy Spaces
- 14 Room Dividers to Organize Your Space
- Wow-Worthy Window Films: 11 Top Picks
- 10 Houseplants to Improve Air Quality
- 10 Ingenious Home Uses for Baking Soda