Williamson-Thermoflo GWC-070 Manual page 99

GWC -
gas fired water boiler
Dimensions and ratings
Boiler dimensional and physical data (see Figure 103, page 98)
Figure 104
Supply
Boiler
model
(inches NPT
male)
GWC-070 1
GWC-105 1
GWC-140 1
GWC-175 1
Note 1: Gas piping from meter to boiler to be sized per local utility requirements.
Boiler ratings
Figure 105
Boiler CSA
model Input Heating
capacity
(Note 1)
MBH
GWC-070 70
GWC-105 105
GWC-140 140
175
GWC-175
Notes: 1. Based on standard test procedures prescribed by the United States Department of Energy. Ratings also
referred to as CSA Output. NOTE that only DOE Heating Capacity and AFUE are certified by AHRI. AFUE is
also know as Annual Fuel Utilization Efficiency or Seasonal Efficiency.
2. Net I=B=R ratings are based on net installed radiation of sufficient quantity for the requirements of the building
and nothing need be added for normal piping and pickup. Ratings are based on a piping and pickup allowance
of 1.15 and are determined under the provisions governing forced draft boiler-burner units. An additional
allowance should be made for unusual piping and pickup loads.
3. All of the boilers will automatically de-rate as vent length increases, due to the pressure loss through the vent.
For vent/air pipe lengths less than the maximum, the derate equals the value above times vent length ÷ 100.
4. Boilers are tested for 50 PSIG working pressure.
5. GWC boilers are not available for millivolt systems.
Part number 550-142-056/0411
— Boiler Manual
Return
Length
L
(inches NPT (inches)
female)
1 30¾
1 30¾
1 37¾
1 37¾
DOE Net I=B=R AFUE
water
(Note 1)
rating
(Note 2)
MBH MBH %
65 56 91.9
97 84 91.2
130 113 91.4
161 140 91.0
(continued)
Gas Electrical
connection service
size required
(Note 1)
(includes
the internal
circulators)
(inches NPT (amperes)
female)
½
½
½
½
Vent/ Boiler
combustion water
(Values shown are at maximum vent/air pipe length)
air diameter content
Direct Exhaust Venting
Inches Gallons Natural gas
3" PVC 3.8 up to 0.7%
3" PVC 4.7 up to 1.0%
3" PVC 6.0
up to 4.0%
3" PVC 6.9 up to 4.0%
Boiler
water
content
(gallons)
15 3.8
15 4.7
15 6.0
15 6.9
DOE
% Input derate vs vent length
(Note 3)
Direct Vent Venting
Propane Natural gas
up to 1.4% up to 1.5%
up to 2.2% up to 4.0%
up to 4.0% up to 7.0%
up to 4.5% up to 7.0%
Approx.
shipping
weight
(pounds)
313
353
423
464
Propane
up to 2.8%
up to 5.4%
up to 8.0%
up to 10.0%
99