4
Dimensions
Central Heating (Sealed System)
GMHB227
GMHB380
Heat Exchanger Max Allowable Working
Pressure
50 psig [3.45 bar]
80 psig [5.5 bar]
Max System Pressure
43
.00
psig
[2.96 bar]
43
.00
psig
[2.96 bar]*
Min System Pressure
7.25
psig [ 0.50 bar]
7.25
psig [0.50 bar]
Max System temperature
176°F
[80°C]
176°F
[80°C]
Pressure Relief Valve Setting*
30
.00
psig [2.11 bar]
50
.00
psig [3.44 bar]
Recommended System Pressure (cold)
21.7 psig [1.5 bar]
21.7 psig [1.5 bar]
SYSTEM
Pressure relief valve connection 3/4" NPT
* Onboard pressure switch display limit.
PN 240012369, REV A [08/31/2018]
PHYSICAL DATA
DIMENSIONS
GMHB227
GMHB380
Height
30 " [763 mm]
37
7/16
" [951 mm]
Width
17
3/4
" [450 mm]
23
5/8"
[600 mm]
Depth
22
5/8
" [585mm]
25
3/8
" [644 mm]
Condensate Trap Connection
3/4" NPT
3/4" NPT
System Supply
1
1/4
” NPT
1
1 /2
" NPT
Gas Connection
3/4” NPT
1 " NPT
System Return
1
1/4
” NPT
1
1/2
" NPT
Primary Water Content
11/4 gal [4.73 L]
4.6 Gal (17.4L)
B
A
C
D
E
F
G
