5
110327-07 - 2/23
ALTA
Combi Installation, Operating & Service Instructions
3
Specifications
Space Heating Ratings
Domestic Hot Water (DHW) Ratings
1
Model
Number
Input
2
(MBH)
DOE
Heating
Capacity
(MBH)
AHRI
Net
Rating
3
(MBH)
AFUE
Input
2
(MBH)
Hot Water Draw Limits GPM (L/min)
2
Min
Max
Min
Max
Max
Min
4
70°F
(39°C)
Rise
77°F
(43°C)
Rise
90°F
(50°C)
Rise
ALTAC-136
ALTAC-136B
13.6
120
112
97
95.0
13.6
136
3.7 (14)
3.4 (13)
2.9 (11) 0.5 (2)
ALTAC-200
20
150
141
123
95.0
20
200 5.2 (19.6) 4.7 (17.8) 4.0 (15) 0.5 (2)
1
DHW ratings are not AHRI certified.
2
Input and DHW draw limits for elevations up to 2,000 ft. (610 m) with min vent length. See Table 3-3 and Table 3-4
for derate at max vent length and altitude.
3
Net AHRI Water Ratings shown are based on a piping and pickup allowance of 1.15. The manufacturer should
be consulted before selecting a boiler for installations having unusual piping and pickup requirements, such as
intermittent operation, extensive piping systems, etc.
4
Min DHW flow rate required through boiler to initiate DHW demand. Higher flow rate through fixture may be
required due to mixing at tempering valve and/or fixture itself.
Model
Number
Depth
in. (mm)
Width
in. (mm)
Height
in. (mm)
Space
Heating
Water
sweat, in.
Domestic
Water
sweat, in.
Gas
NPT
Relief
Valve NPT
Maximum
Allowable
Working
Pressure
psig (kPa)
ALTAC-136
ALTAC-136B 16.3 (413) 17.8 (453) 29.8 (757)
1-1/4
3/4
1/2
3/4
50 (345)
ALTAC-200
20.4 (518) 17.8 (453) 29.8 (757)
1-1/4
3/4
1/2
3/4
50 (345)
Table 3-2: Dimensions and Connections
Table 3-1: Ratings
Table 3-3: Air Intake and Vent Lengths
Model Number
Intake/Vent Size in. (mm)
Min Length
ft. (m)
Max Length
ft. (m)
Approx. Derate at
Max. Length (%)
ALTAC-136
ALTAC-136B
Standard
2 (60)
2.5 (0.76)
70 (21.3)
7
w/ increaser
3 (80)
2.5 (0.76)
135 (41.1)
1
ALTAC-200
Standard
2 (60)
2.5 (0.76)
70 (21.3)*
9
w/ increaser
3 (80)
2.5 (0.76)
135 (41.1)
5
* Reduced to 50 eq. ft. (15.2 m) for 200 combi LP installations above 8,000 ft. (2,438 m)
